ISO/FDIS 11300-2

• Abstract:

  This document specifies requirements and test methods for pipes and fittings which are part of piping systems for the rehabilitation of underground non-pressure and pressure drainage and sewerage networks, and of water supply networks which transport water intended for human consumption, including raw water intake pipelines. It is applicable to the renovation technique family: — lining with cured-in-place pipes (CIPP). It applies to the use of thermoset composite materials with various thermosetting resin systems, in combination with compatible fibrous carrier materials, reinforcement, and other process-related plastics components (see 5.1). It is applicable to pipes and fittings, as manufactured, as well as to the installed system, with service temperatures up to 50 °C for drainage and sewerage networks and up to 25°C for water supply networks. For pressurised networks, this document applies to independent (fully structural, class A) and interactive (semi structural, class B) pressure pipe liners, as defined in ISO 11295, which do not rely on adhesion to the existing pipeline. It does not include requirements or test methods for resistance to abrasion, cyclic loading or impact, which are outside the scope of this document.

• Status: Not Published
• ICS: 23.040.05 - Pipeline and its parts for external sewage systems
• ICS: 91.140.80 - Drainage systems
• ICS: 93.025 - External water conveyance systems
• ICS: 93.030 - External sewage systems
• Technical Committee: ISO/TC 138/SC 8 - Rehabilitation of pipeline systems
• Drafting Committee: ISO/TC 138/SC 8 - Rehabilitation of pipeline systems
• Current Stage: 5020 - FDIS ballot initiated: 2 months. Proof sent to secretariat
• Start Date: 14-Jul-2026
• Completion Date: 14-Jul-2026

• Consolidates: FprEN ISO 11300-2 - Piping systems for rehabilitation of underground drains, sewers and water supply networks-Part 2: Thermoset composite materials (ISO/DIS 11300-2:2025)
• Effective Date: 12-Feb-2026
• Consolidates: ISO 10952:2021 - Glass-reinforced thermosetting plastics (GRP) pipes and fittings — Determination of the resistance to chemical attack for the inside of a section in a deflected condition
• Effective Date: 18-May-2024
• Revises: ISO 11296-4:2018/Amd 1:2021 - Plastics piping systems for renovation of underground non-pressure drainage and sewerage networks — Part 4: Lining with cured-in-place pipes — Amendment 1: Updated definitions, marking requirements and procedure for alternative expression of flexural test results
• Effective Date: 05-Nov-2022
• Revises: ISO 11296-1:2018 - Plastics piping systems for renovation of underground non-pressure drainage and sewerage networks — Part 1: General
• Effective Date: 05-Nov-2022
• Revises: ISO 11297-4:2018 - Plastics piping systems for renovation of underground drainage and sewerage networks under pressure — Part 4: Lining with cured-in-place pipes
• Effective Date: 05-Nov-2022
• Revises: ISO 11297-1:2018 - Plastics piping systems for renovation of underground drainage and sewerage networks under pressure — Part 1: General
• Effective Date: 05-Nov-2022
• Revises: ISO 11298-4:2021 - Plastics piping systems for renovation of underground water supply networks — Part 4: Lining with cured-in-place pipes
• Effective Date: 05-Nov-2022
• Revises: ISO 11298-1:2018 - Plastics piping systems for renovation of underground water supply networks — Part 1: General
• Effective Date: 05-Nov-2022
• Revises: ISO 11296-4:2018 - Plastics piping systems for renovation of underground non-pressure drainage and sewerage networks — Part 4: Lining with cured-in-place pipes
• Effective Date: 05-Nov-2022

Overview

ISO/FDIS 11300-2: Piping systems for rehabilitation of underground drains, sewers and water supply networks – Part 2: Thermoset composite materials is an international standard published by ISO. This document specifies the requirements and test methods for pipes and fittings composed of thermoset composite materials. It is intended for use in the rehabilitation of underground non-pressure and pressure drainage and sewerage networks, as well as water supply networks, including those for water intended for human consumption.

The standard applies to systems using the cured-in-place pipe (CIPP) lining technique. CIPP involves inserting a resin-impregnated tube into the existing pipe, which is then cured to form a robust inner lining. The document covers both the as-manufactured and installed systems and sets out service temperature thresholds of up to 50°C for drainage and sewerage, and up to 25°C for water supply applications.

Key Topics

• Material Requirements: Specifies acceptable thermosetting resin systems and compatible fibrous and plastic components for the manufacture and installation of CIPP liners.
• Pipe and Fitting Characteristics:
  • Mechanical and physical properties required for pipes and fittings.
  • Geometric features, such as wall thickness and structure at different stages of installation.
  • Requirements for marking, sampling, and jointing.
• Fitness for Purpose: Defines performance testing for both the materials and final installed systems to ensure durability and compliance.
• Installation Practice:
  • Preparatory work, storage, handling, and transport of CIPP tube components.
  • Equipment and environmental or safety precautions.
  • Detailed installation and final inspection protocols.
• Test Methods: Incorporates procedures for testing short-term and long-term flexural properties, including resistance to stress under various conditions (dry, wet, acidic).
• Documentation: Outlines the mandatory reporting, installation manual content, and record-keeping for quality assurance.

Applications

ISO/FDIS 11300-2 provides essential guidance for the rehabilitation of a wide range of buried infrastructure:

• Rehabilitation of Drains and Sewers: Suitable for both non-pressurized and pressurized municipal sewers and stormwater networks, allowing improved asset life without excavation.
• Water Supply Networks: Ensures safe renovation of pipelines carrying potable water and raw water, with additional material requirements for components in contact with drinking water.
• CIPP Lining Technique: Offers a no-dig solution for renewing pipes, reducing disruptions and environmental impact during utility upgrades or repairs.
• Structured and Non-Structural Liners: Applies to both fully structural liners (independent of host pipe) and semi-structural liners (interactive), as defined in ISO 11295.

Users include pipeline engineers, utilities, contractors specializing in trenchless rehabilitation, and manufacturers of thermoset composite lining systems.

Related Standards

• ISO 11300-1: Polyethylene (PE) materials for rehabilitation of underground piping systems.
• ISO 11300-3: PVC-U materials for rehabilitation of piping systems.
• ISO 11300-4 (in preparation): Thermoplastic composite materials.
• ISO 11295: Framework for classification and guidance on the selection of renovation and replacement techniques in pipeline systems.
• ISO 11296-1 & ISO 11296-4 (replaced by the ISO 11300 series): Rehabilitation of water supply and drain pipelines using plastics piping materials.

Benefits and Value

Complying with ISO/FDIS 11300-2 ensures pipe rehabilitation projects meet internationally-recognized standards for safety, reliability, and performance with thermoset composite materials. This standard is vital for cities, utilities, and contractors seeking efficient, minimally invasive methods for extending the life of underground infrastructure, especially where health, environmental compliance, and system longevity are priorities.

FINAL DRAFT
International
Standard
ISO/TC 138/SC 8
Piping systems for rehabilitation
Secretariat: JISC
of underground drains, sewers and
Voting begins on:
water supply networks —
2026-07-14
Part 2:
Voting terminates on:
2026-09-08
Thermoset composite materials
Systèmes de canalisations pour la réhabilitation des
branchements, des collecteurs d’assainissement et des réseaux
d’alimentation en eau enterrés —
Partie 2: Matériaux composites thermodurcissables
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/CEN PARALLEL PROCESSING LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 138/SC 8
Piping systems for rehabilitation
Secretariat: JISC
of underground drains, sewers and
Voting begins on:
water supply networks —
Part 2:
Voting terminates on:
Thermoset composite materials
Systèmes de canalisations pour la réhabilitation des
branchements, des collecteurs d’assainissement et des réseaux
d’alimentation en eau enterrés —
Partie 2: Matériaux composites thermodurcissables
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2026
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
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TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
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MADE IN NATIONAL REGULATIONS.
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ii
Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
3.1 General terms .3
3.2 Terms related to techniques .3
3.3 Terms related to characteristics.5
3.4 Terms related to product stages .7
3.5 Terms related to materials .8
3.6 Terms related to service conditions .9
4 Symbols and abbreviated terms. 9
4.1 Symbols .9
4.2 Abbreviated terms . 12
5 Pipes .12
5.1 Materials . 12
5.2 General characteristics .14
5.3 Material characteristics . 15
5.3.1 Resin system . 15
5.3.2 Special requirements for formulation of components in contact with drinking
water . 15
5.4 Geometric characteristics . 15
5.4.1 General . 15
5.4.2 Wall thickness at the “M” stage .16
5.4.3 Wall thickness at the “I” stage .16
5.4.4 CIPP wall structure at the “I” stage .16
5.5 Mechanical characteristics .17
5.5.1 General .17
5.5.2 Reference conditions for testing .17
5.5.3 Test requirements .17
5.6 Physical characteristics .21
5.7 Additional characteristics .21
5.8 Sampling . 22
5.8.1 General . 22
5.8.2 Non-pressure drains and sewers . 22
5.9 Jointing. 23
5.10 Marking . 23
6 Fittings .23
6.1 General . 23
6.2 General characteristics .24
6.3 Material characteristics .24
6.4 Geometric characteristics .24
6.5 Mechanical characteristics . 25
6.6 Physical characteristics . 25
6.7 Jointing. 26
6.8 Marking . 26
7 Ancillary components .26
8 Fitness for purpose .26
8.1 Materials . 26
8.2 General characteristics .27
8.3 Geometric characteristics .27
8.4 Mechanical characteristics . 28

iii
8.5 Additional characteristics . 28
8.6 Sampling . 29
8.7 Regional requirements for the CIPP lining system . 29
9 Installation practice .29
9.1 Preparatory work . 29
9.2 Storage, handling and transport of lining tube components. 29
9.3 Equipment . 29
9.3.1 General . 29
9.3.2 Technique-specific equipment . 29
9.4 Installation . 30
9.4.1 General . 30
9.4.2 Environmental precautions .31
9.4.3 Safety precautions .31
9.4.4 Installation procedures .31
9.4.5 Simulated installations .32
9.5 Process-related inspection and testing .32
9.6 Lining process termination .32
9.7 Reconnection to the existing pipeline system .32
9.7.1 General .32
9.7.2 Non-pressure networks . 33
9.7.3 Pressure networks . 33
9.8 Final inspection and testing . 33
9.9 Documentation . 33
Annex A (informative) CIPP liner components and their functions .34
Annex B (normative) Cured-in-place pipes — Determination of short-term flexural properties .35
Annex C (normative) Cured-in-place pipes — Determination of long-term flexural modulus
under dry or wet conditions .46
Annex D (normative) Cured-in-place pipes — Determination of long-term flexural strength
under dry, wet or acidic conditions (stress corrosion test) .50
Annex E (informative) Summary of required elements to be included in installation manuals .54
Bibliography .56

iv
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely
with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the
transport of fluids, Subcommittee SC 8, Rehabilitation of pipeline systems, in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 155, Plastics piping systems and
ducting systems, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
This first edition of ISO 11300-2, along with ISO 11300-1:2026, ISO 11300-3:2026 and ISO/DIS 11300-4,
cancels and replaces ISO 11296-1:2018, ISO 11296-4:2018, ISO 11296-4:2018/Amd 1:2021, ISO 11297-1:2018,
ISO 11297-4:2018, ISO 11298-1:2018 and ISO 11298-4:2021, which have been technically revised.
The main changes are as follows:
— for piping systems made from thermoset composite materials, this document replaces the related
content, including requirements, of the documents listed above;
— definitions in Clause 3 have been amended and new definitions have been added;
— a new material classification of thermoplastics membranes has been added (see Table 1);
— the material classification of resin systems has been expanded (see Table 2);
— additional requirements for declaration of short-term mechanical characteristics have been included
(see Table 5);
— the classification of lateral connections has been extended (new class D collar added in Table 8 and
Figure 6);
— in Annex B all references to ISO 178 have been removed and replaced by references to ISO 14125 only;
— in B.5.4, the procedure for determining apparent flexural modulus of curved samples has been amended
and the formula for associated curvature correction factor modified to take account of large, geometry-
changing deformations of the test pieces and friction at the supports. The previous curvature correction
factor for stress has been deleted;

v
— in B.5.5, the correction for curvature of the apparent section bending modulus has been similarly
updated.
A list of all parts in the ISO 11300 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

vi
Introduction
This document is a part of a series of International Standards concerning piping systems of various
materials used for the rehabilitation of existing pipelines in a specified application area. System Standards
for rehabilitation deal with the following applications:
— ISO 11300 series: Piping systems for rehabilitation of underground drains, sewers and water supply networks;
— ISO 11301 series: Piping systems for rehabilitation of underground gas supply networks.
The ISO 11300 and ISO 11301 series are subdivided into parts each covering a specific material or class of
material of the piping system.
ISO 11300 series is subdivided into four parts:
— Part 1: Polyethylene (PE) material;
— Part 2: Thermoset composite materials (this document);
— Part 3: PVC-U material;
— Part 4: Thermoplastic composite materials.
These documents cover various techniques for renovation and trenchless replacement. Furthermore, they
are distinguished from those for conventionally installed plastics piping systems by the requirement to
verify certain characteristics in the “as-installed condition”, after site processing. This is in addition to
specifying requirements for piping system components “as manufactured”.
A consistent structure of clause headings has been adopted for all parts of the ISO 11300 series and the
ISO 11301 series, in order to facilitate direct comparisons across rehabilitation technique families.
Figure 1 shows the clause structure and the relationship between the ISO 11300 series and the ISO 11301
series.
For complementary information, see ISO 11295.
For assessment of conformity to the requirements of this document, see ISO/TS 23818-2.

vii
a
In preparation.
Figure 1 — Clause structure of the ISO 11300 series and the ISO 11301 series
The various techniques for rehabilitation of underground drains and sewers and water supply networks,
within the scope of pipeline rehabilitation techniques generally, are shown schematically in Figure 2. For
definitions of standardized renovation and replacement techniques shown in Figure 2, but outside the scope
of this document, see ISO 11295.

viii
a
This document is applicable, for piping systems made from thermoset composite materials.
Figure 2 — Technique families for renovation of underground drains, sewers and water supply
networks using plastics pipes, within the scope of pipeline rehabilitation techniques

ix
FINAL DRAFT International Standard ISO/FDIS 11300-2:2026(en)
Piping systems for rehabilitation of underground drains,
sewers and water supply networks —
Part 2:
Thermoset composite materials
1 Scope
This document specifies requirements and test methods for pipes and fittings which are part of piping
systems for the rehabilitation of underground non-pressure and pressure drains and sewers, and of water
supply networks which transport water intended for human consumption, including raw water intake
pipelines.
This document is applicable to the renovation technique family "lining with cured-in-place pipes (CIPP)". It is
not applicable to lining with discrete pipes or lining with pipe segments using glass-reinforced thermosetting
plastics (GRP) material, as defined by ISO 11295.
It is not applicable to short lengths of CIPP used for patch repair only of local pipe defects.
It applies to the use of thermoset composite materials with various thermosetting resin systems, in
combination with compatible fibrous carrier materials, reinforcement, and thermoplastics membranes (see
5.1).
It is applicable to pipes and fittings, as manufactured, as well as to the installed system. It applies for service
temperatures up to 50 °C for drains and sewers and up to 25 °C for water supply networks.
For pressurised networks, this document applies to independent (fully structural, class A) and interactive
(semi structural, class B) pressure pipe liners, as defined in ISO 11295, which do not rely on adhesion to the
existing pipeline.
It does not include requirements or test methods for resistance to abrasion, jetting, cyclic loading or impact,
which are outside the scope of this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 75-2:2013, Plastics — Determination of temperature of deflection under load — Part 2: Plastics and ebonite
ISO 899-2:2024, Plastics — Determination of creep behaviour — Part 2: Flexural creep by three-point loading
ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions
ISO 4435, Plastics piping systems for non-pressure underground drainage and sewerage — Unplasticized
poly(vinyl chloride) (PVC-U)
ISO 4633, Rubber seals — Joint rings for water supply, drainage and sewerage pipelines — Specification for
materials
ISO 7432, Glass-reinforced thermosetting plastics (GRP) pipes and fittings — Test methods to prove the design of
locked socket-and-spigot joints, including double-socket joints, with elastomeric seals

ISO 7509, Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes — Determination of
time to failure under sustained internal pressure
ISO 7685:2026, Glass-reinforced thermosetting plastics (GRP) pipes — Determination of initial ring stiffness
ISO 8513:2023, Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes — Test methods
for the determination of the initial longitudinal tensile strength
ISO 8521:2020, Glass-reinforced thermosetting plastic (GRP) pipes — Test methods for the determination of the
initial circumferential tensile wall strength
ISO 8533, Glass-reinforced thermosetting plastics (GRP) pipes and fittings — Test methods to prove the design of
cemented or wrapped joints
ISO 8773, Plastics piping systems for non-pressure underground drainage and sewerage — Polypropylene (PP)
ISO 10468:2023, Glass-reinforced thermosetting plastics (GRP) pipes — Determination of the ring creep
properties under wet or dry conditions
ISO 10928:2024, Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes and fittings —
Methods for regression analysis and their use
ISO 10952, Glass-reinforced thermosetting plastics (GRP) pipes and fittings — Determination of the resistance
to chemical attack for the inside of a section in a deflected condition
ISO 11295:2026, Plastics piping systems used for the rehabilitation of pipelines — Classification and overview of
strategic, tactical and operational activities
ISO 13002, Carbon fibre — Designation system for filament yarns
ISO 14125:1998, Fibre-reinforced plastic composites — Determination of flexural properties
ISO 23856:2021, Plastics piping systems for pressure and non-pressure water supply, drainage or sewerage —
Glass-reinforced thermosetting plastics (GRP) systems based on unsaturated polyester (UP) resin
EN 681-1, Elastomeric seals — Material requirements for pipe joint seals used in water and drainage
applications — Part 1: Vulcanized rubber
EN 681-2, Elastomeric seals — Material requirements for pipe joint seals used in water and drainage
applications — Part 2: Thermoplastic elastomers
EN 681-3, Elastomeric seals — Material requirements for pipe joint seals used in water and drainage
applications — Part 3: Cellular materials of vulcanized rubber
EN 681-4, Elastomeric seals — Material requirements for pipe joint seals used in water and drainage
applications — Part 4: Cast polyurethane sealing elements
EN 1610:2015, Construction and testing of drains and sewers
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 11295 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/

3.1 General terms
3.1.1
characteristic
property, dimension or other feature of a material or component
[SOURCE: ISO 11300-1:2026, 3.1.1]
3.1.2
declared value
limiting value of a characteristic (3.1.1) declared in advance by the rehabilitation system supplier (3.1.3)
supplier, which becomes the requirement for the purposes of assessment of conformity
[SOURCE: ISO 11300-1:2026, 3.1.2]
3.1.3
rehabilitation system supplier
entity that specifies the field and range of application and brings together the components of a rehabilitation
system to meet the requirements of the product standard at the “M” stage (3.4.1), so that when installed in
accordance with the installation manual they meet the requirements of the product standard at the “I” stage
(3.4.2)
[SOURCE: ISO 11300-1:2026, 3.1.5]
3.1.4
system installer
entity that prepares the host pipe, takes the rehabilitation system at the “M” stage (3.4.1) and installs it so
that it is at the “I” stage (3.4.2)
[SOURCE: ISO 11300-1:2026, 3.1.6]
3.1.5
type testing
testing performed to prove that a material, component, joint or assembly is capable of conforming to the
requirements given in the applicable standard
[SOURCE: ISO 11300-1:2026, 3.1.7]
3.2 Terms related to techniques
3.2.1
inversion
process of turning a flexible tube or hose inside out by the use of fluid (water or air) pressure
3.2.2
inverted-in-place insertion
method whereby the lining tube (3.2.11) is installed by inversion (3.2.1) to achieve simultaneous insertion
and inflation
3.2.3
inflation
process of expanding a lining tube (3.2.11) to achieve a close fit (3.2.5) to the existing pipeline by the use of
fluid (water or air) pressure
3.2.4
winched-in-place insertion
method whereby the flat lining tube (3.2.11) is first pulled into the pipe to be lined and then inflated to bring
it up to size
Note 1 to entry: With some techniques, inflation (3.2.3) is achieved by inversion (3.2.1) through the pulled-in lining
tube (3.2.11) of a separate impregnated tube or dry tube or hose. Hoses can either be withdrawn after resin cure or
left in place as a permanent or semi-permanent internal membrane.

3.2.5
close fit
situation of the outside of the installed liner relative to the inside of the existing pipeline, which may either
be an interference fit or include a small annular gap resulting from shrinkage and tolerances only
[SOURCE: ISO 11300-1:2026, 3.2.1]
3.2.6
CIPP liner
cured-in-place pipe liner
lining tube (3.2.11) after installation and resin cure
3.2.7
CIPP lining system
lining tube (3.2.11) and all relevant fittings for insertion into an existing pipeline for the purposes of
renovation
3.2.8
CIPP product
cured-in-place pipe product
cured-in-place pipe liner (3.2.6) of a particular design, produced from a lining tube (3.2.11) of specified
materials, with a wall structure which is uniquely defined for each diameter/wall thickness combination,
and which is impregnated with a specific resin system (3.5.6) and installed by a specific process
3.2.9
composite design thickness
e
c,d
required wall thickness of the composite (3.5.3), excluding any abrasion layer (3.5.1), as determined by
structural design
Note 1 to entry: in practice for multi-layer composites e can be calculated as the design value of the thickness e
c,d psl
of the primary structural layer (3.5.7), to which the thicknesses of any internal and external resin-rich layers (3.5.8),
excluding any abrasion layer, are then added.
3.2.10
lateral connection collar
fitting for reconnecting a lined main pipe to an existing or renovated lateral pipe
3.2.11
lining tube
flexible tube, consisting of resin system (3.5.6), carrier material (3.5.2) and either reinforcement (3.5.5) or
membranes or both, as combined prior to insertion in the pipe to be lined
3.2.12
permanent membrane
internal or external membrane designed to retain its integrity through the processes of transportation
and storage, lining tube (3.2.11) insertion and resin system (3.5.6) cure, and to provide functions for the
operational life of the cured-in-place pipe liner (3.2.6)
3.2.13
semi-permanent membrane
internal or external membrane designed to provide protection during transportation and storage and to
remain functional through the processes of lining tube (3.2.11) insertion and resin system (3.5.6) cure, but
not relied on to retain its integrity at the “I” stage
3.2.14
temporary membrane
membrane forming the internal or external surface of the lining tube (3.2.11) for the purposes of protection
during transportation and storage and with process-related functions only during installation
Note 1 to entry: Internal temporary membranes are removed during or after the installation.

3.2.15
preliner
permanent or semi-permanent external membrane which is installed separately before the insertion of the
lining tube (3.2.11)
3.2.16
nominal CIPP “M” stage wall thickness
nominal cured-in-place pipe “M” stage wall thickness
e
n,M
one of a range of discrete wall thicknesses of the dry fibre components of the lining tube (3.2.11) dictated
by the sum of the thicknesses of the individual layers of carrier material (3.5.2) and reinforcement (3.5.5)
used for tube construction at the “M” stage, prior to their impregnation with the resin system (3.5.6) and
excluding any internal or external membranes
Note 1 to entry: Applicable only where dry tube manufacture and resin impregnation undertaken as separate
processes.
3.2.17
nominal CIPP “I” stage wall thickness
nominal cured-in-place pipe “I” stage wall thickness
e
n,I
one of a range of discrete CIPP liner (3.2.6) wall thicknesses at the “I” stage, dictated by the sum of the
thicknesses of the individual layers of materials used for lining tube (3.2.11) construction, excluding any
internal or external membranes
3.3 Terms related to characteristics
3.3.1
nominal outside diameter
d
n
outside diameter of cured-in-place pipe liner (3.2.6) specified as the inside diameter of the pipe to be lined
3.3.2
mean diameter
d
m
diameter of the circle corresponding to the middle of the pipe wall cross-section
Note 1 to entry: In the case of a cured-in-place pipe liner (3.2.6), measured to mid-thickness of the composite (3.5.3)
[SOURCE: ISO 23856:2021, 3.3 — modified]
3.3.3
wall thickness
e
value of the measurement of the wall thickness at any point around the circumference of a component
[SOURCE: ISO 11300-1:2026, 3.3.6]
3.3.4
mean wall thickness
e
m
arithmetic mean of a number of measurements of the wall thickness regularly spaced around the
circumference and in the same cross-section of a component, including the measured minimum and the
measured maximum values of the wall thickness in that cross-section
[SOURCE: ISO 11300-1:2026, 3.3.7]

3.3.5
nominal wall thickness
e
n
numerical designation of the wall thickness of a component which is a convenient round number,
approximately equal to the manufacturing dimension in millimetres (mm)
[SOURCE: ISO 11300-1: 2026, 3.3.9 — modified by removal of Note 1 to entry which is not relevant to this
document]
3.3.6
total thickness
e
tot
thickness of cured-in-place pipe liner (3.2.6) comprising the composite (3.5.3) and any semi-permanent
(3.2.13) and permanent membranes (3.2.12)
3.3.7
composite thickness
e
c
thickness of composite (3.5.3) at the “I” stage (3.4.2).
3.3.8
LCL
lower confidence limit
lower fractile of distribution of test results
3.3.9
first break
first major discontinuity of the stress-strain curve characterized by a sudden drop in stress associated with
local failure of the composite (3.5.3)
Note 1 to entry: It is also generally accompanied by an audible crack.
3.3.10
ring stiffness
measure of the resistance per unit length of a pipe to diametric deflection in response to external loading
applied along one longitudinal diametric plane, as defined by the formula:
EI
S
S 
d
m
where
E is the apparent modulus of elasticity as determined in a ring stiffness test
S
d is the mean diameter of the pipe (see 3.3.5)
m
I is the second moment of area of the pipe wall per unit length, i.e.:
e
I=
where e is the wall thickness (in this document composite thickness e (3.3.7))
c
Note 1 to entry: This definition applies to both long and short-term values.
[SOURCE: ISO 23856:2021, 3.17.3 — modified by designating composite thickness as the relevant wall
thickness]
3.3.11
initial ring stiffness
S
value of ring stiffness (3.3.10) obtained when determined in accordance with ISO 7685
[SOURCE: ISO 23856:2021, 3.17.1 — modified, Note 1 to entry omitted]
3.3.12
long-term creep ring stiffness
S
x
value of ring stiffness (3.3.10) at x years, determined in accordance with ISO 10468
[SOURCE: ISO 23856:2021, 3.17.2 — modified, different symbol and Note 1 to entry omitted]
3.3.13
long-term flexural modulus
E
x
value representing the projected long-term creep behaviour of the composite (3.5.3) in bending, expressed
as an applied stress divided by extrapolated long-term strain after elapsed time of x years
3.3.14
projected failure pressure at 50 years
p
value at 50 years derived from the pressure regression line obtained from long-term pressure tests
performed in accordance with ISO 7509 and analysed in accordance with ISO 10928
[SOURCE: ISO 23856:2021, 3.12.10]
3.3.15
minimum long-term failure pressure
least value for long-term burst failure pressure, which is evaluated in accordance with the procedures
described in ISO 10928 and includes a factor of safety, FS
min
Note 1 to entry: This term is expressed using the symbol p , where x denotes the elapsed time in years at which the
x,min
long-term failure pressure is determined (see 4.1).
[SOURCE: ISO 23856:2021, 3.12.5 — modified Note to entry.]
3.4 Terms related to product stages
3.4.1
“M” stage
stage as manufactured, before any subsequent site processing of components associated with the particular
renovation technique
Note 1 to entry: For pipes and fittings at the “M” stage, see Clause 5 and Clause 6, respectively.
[SOURCE: ISO 11300-1:2026, 3.4.1]
3.4.2
“I” stage
stage as installed, i.e. in final configuration after any site processing of components associated with the
particular renovation technique
Note 1 to entry: For pipes and fittings at the “I” stage, see Clause 8.
[SOURCE: ISO 11300-1:2026, 3.4.2]

3.5 Terms related to materials
3.5.1
abrasion layer
inner layer of composite (3.5.3) of declared thickness or internal membrane provided as a sacrificial layer for
abrasion of the cured-in-place pipe liner (3.2.6) in service
Note 1 to entry: Where the abrasion layer is part of the composite, its thickness is expressed using the symbol e (see
c,a
4.1).
3.5.2
carrier material
porous component of the lining tube (3.2.11), which carries the liquid resin system (3.5.6) during insertion
into the pipe being renovated and forms part of the cured-in-place pipe liner (3.2.6) once the resin has been
cured
3.5.3
composite
combination of cured resin system (3.5.6), carrier material (3.5.2) and any reinforcement (3.5.5), excluding
any internal or external membranes
Note 1 to entry: Cured resin not wholly contained within the carrier material or any separate reinforcement layer is
nevertheless part of the composite.
3.5.4
curing
process of resin polymerization, which can occur at ambient temperature or be initiated or accelerated by
the use of heat or exposure to light
3.5.5
reinforcement
fibres incorporated in the lining tube (3.2.11) which enhance its dimensional stability and the structural
properties of the cured-in-place pipe liner (
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ISO/TC 138/SC 8
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Date: 2025-05-01
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Piping systems for rehabilitation of underground drains, sewers and .
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water supply networks —
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Part 2:
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Thermoset composite materials
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ISO #####-#:####(X)
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Systèmes de canalisations pour la réhabilitation des branchements, des collecteurs d’assainissement et des
réseaux d’alimentation en eau enterrés —
Partie 2: Matériaux composites thermodurcissables
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Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which
they are aware and to provide supporting documentation.

A model document of an International Standard (the Model International Standard) is available at:
https://www.iso.org/drafting-standards.html

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2 © ISO #### – All rights reserved

ISO /FDIS 11300-2:2026(Een) Formatted: Font: 11 pt, Bold
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ISO copyright office
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Contents
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Foreword . viii
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Introduction . x
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
3.1 General terms . 3
3.2 Terms related to techniques . 3
3.3 Terms related to characteristics . 5
3.4 Terms related to product stages . 8
3.5 Terms related to materials . 8
3.6 Terms related to service conditions . 9
4 Symbols and abbreviated terms . 10
4.1 Symbols . 10
4.2 Abbreviated terms . 12
5 Pipes . 12
5.1 Materials . 12
5.2 General characteristics . 16
5.3 Material characteristics . 17
5.4 Geometric characteristics . 17
5.5 Mechanical characteristics . 19
5.6 Physical characteristics . 26
5.7 Additional characteristics . 26
5.8 Sampling . 27
5.9 Jointing . 28
5.10 Marking . 28
6 Fittings . 29
6.1 General. 29
6.2 General characteristics . 29
6.3 Material characteristics . 29
6.4 Geometric characteristics . 29
6.5 Mechanical characteristics . 32
6.6 Physical characteristics . 33
6.7 Jointing . 33
6.8 Marking . 33
7 Ancillary components . 33
8 Fitness for purpose. 34
8.1 Materials . 34
8.2 General characteristics . 34
8.3 Geometric characteristics . 35
8.4 Mechanical characteristics . 35
8.5 Additional characteristics . 36
8.6 Sampling . 36
8.7 Regional requirements for the CIPP lining system . 36
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9 Installation practice . 36
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9.1 Preparatory work . 36
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9.2 Storage, handling and transport of lining tube components . 37
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9.3 Equipment . 37
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9.4 Installation . 38
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9.5 Process-related inspection and testing . 40
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9.6 Lining process termination . 40
9.7 Reconnection to the existing pipeline system . 41
9.8 Final inspection and testing . 41
9.9 Documentation . 42
Annex A (informative) CIPP liner components and their functions . 43
Annex B (normative) Cured-in-place pipes — Determination of short-term flexural properties 45
Annex C (normative) Cured-in-place pipes — Determination of long-term flexural modulus
under dry or wet conditions . 60
Annex D (normative) Cured-in-place pipes — Determination of long-term flexural strength
under dry, wet or acidic conditions (stress corrosion test) . 65
Annex E (informative) Summary of required elements to be included in installation manuals . 69
Bibliography . 71

Foreword . vi
Introduction . viii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
3.1 General terms . 3
3.2 Terms related to techniques . 3
3.3 Terms related to characteristics . 5
3.4 Terms related to product stages . 7
3.5 Terms related to materials . 8
3.6 Terms related to service conditions . 9
4 Symbols and abbreviated terms . 9
4.1 Symbols . 9
4.2 Abbreviated terms . 11
5 Pipes . 12
5.1 Materials . 12
5.2 General characteristics . 15
5.3 Material characteristics . 15
5.3.1 Resin system . 15
5.3.2 Special requirements for formulation of components in contact with drinking water . 16
5.4 Geometric characteristics . 16
5.4.1 General. 16
5.4.2 Wall thickness at the “M” stage . 16
5.4.3 Wall thickness at the “I” stage . 16
5.4.4 CIPP wall structure at the “I” stage . 17
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5.5 Mechanical characteristics . 17
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5.5.1 General. 17
5.5.2 Reference conditions for testing . 17
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5.5.3 Test requirements . 18
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5.6 Physical characteristics . 22
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5.7 Additional characteristics . 22
5.8 Sampling . 23
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5.8.2 Non-pressure drains and sewers . 23
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5.9 Jointing . 24
5.10 Marking . 24
6 Fittings . 25
6.1 General. 25
6.2 General characteristics . 25
6.3 Material characteristics . 25
6.4 Geometric characteristics . 25
6.5 Mechanical characteristics . 27
6.6 Physical characteristics . 27
6.7 Jointing . 27
6.8 Marking . 27
7 Ancillary components . 28
8 Fitness for purpose. 28
8.1 Materials . 28
8.2 General characteristics . 28
8.3 Geometric characteristics . 29
8.4 Mechanical characteristics . 29
8.5 Additional characteristics . 30
8.6 Sampling . 30
8.7 Regional requirements for the CIPP lining system . 30
9 Installation practice . 31
9.1 Preparatory work . 31
9.2 Storage, handling and transport of lining tube components . 31
9.3 Equipment . 31
9.3.1 General. 31
9.3.2 Technique-specific equipment. 31
9.4 Installation . 32
9.4.1 General. 32
9.4.2 Environmental precautions . 32
9.4.3 Safety precautions . 32
9.4.4 Installation procedures . 33
9.4.5 Simulated installations . 33
9.5 Process-related inspection and testing . 34
9.6 Lining process termination . 34
9.7 Reconnection to the existing pipeline system . 34
9.7.1 General. 34
9.7.2 Non-pressure networks . 35
9.7.3 Pressure networks . 35
9.8 Final inspection and testing . 35
9.9 Documentation . 35
Annex A (informative) CIPP liner components and their functions . 36
Annex B (normative) Cured-in-place pipes — Determination of short-term flexural properties 38
B.1 General. 38
B.2 Apparatus . 38
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B.3 Test piece shape and dimensions . 38
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B.4 Procedure . 41
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B.5 Calculation and expression of results . 43
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B.6 Test report . 47
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Annex C (normative) Cured-in-place pipes — Determination of long-term flexural modulus
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under dry or wet conditions . 49
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C.1 General. 49
C.2 Principle . 49
C.3 Apparatus . 49
C.4 Sample preparation . 49
C.5 Preparation of test pieces . 49
C.6 Procedure . 50
C.7 Expression of results . 51
C.8 Test report . 52
Annex D (normative) Cured-in-place pipes — Determination of long-term flexural strength
under dry, wet or acidic conditions (stress corrosion test) . 54
D.1 Principle . 54
D.2 Apparatus . 54
D.3 Test pieces . 55
D.4 Test report . 56
Annex E (informative) Summary of required elements to be included in installation manuals . 58
Bibliography . 60

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Foreword
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ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of
ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directiveswww.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
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patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents.www.iso.org/patents. ISO shall not be held responsible for identifying any or all such
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patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.htmlwww.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the
transport of fluids, Subcommittee SC 8, Rehabilitation of pipeline systems, in collaboration with the European
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Committee for Standardization (CEN) Technical Committee CEN/TC 155, Plastics piping systems and ducting
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systems, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
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Agreement).
This first edition of ISO 11300-2:2026, along with ISO 11300-1:2026, ISO 11300-3:2026 and ISO/DIS 11300-
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4 (in preparation),, cancels and replaces ISO 11296-1:2018, ISO 11296-4:2018, ISO 11296-4:2018/Amd
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1:2021, ISO 11297-1:2018, ISO 11297-4:2018, ISO 11298-1:2018 and ISO 11298-4:2021, which have been
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technically revised.
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The main changes are as follows:
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— for piping systems made from thermoset composite materials, this document replaces the related content, Formatted: Font: Cambria, English (United Kingdom)
including requirements, of the documents listed above;
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— definitions in Clause 3Clause 3 have been amended and new definitions have been added;
— a new material classification of thermoplastics membranes has been added (see Table 1);Table 1);
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— the material classification of resin systems has been expanded (see Table 2);Table 2);
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— additional requirements for declaration of short-term mechanical characteristics have been included (see
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Table 5); Table 5);
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— the classification of lateral connections has been extended (new class D collar added in Table 8Table 8 and
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Figure 6);Figure 6);
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— in Annex BAnnex B all references to ISO 178 have been removed and replaced by references to ISO 14125
only;
— in B.5.4,in B.5.4, the procedure for determining apparent flexural modulus of curved samples has been
amended and the formula for associated curvature correction factor modified to take account of large,
geometry-changing deformations of the test pieces and friction at the supports. The previous curvature
correction factor for stress has been deleted;
— in B.5.5,in B.5.5, the correction for curvature of the apparent section bending modulus has been similarly
updated.
A list of all parts in the ISO 11300 series can be found on the ISO website.
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Any feedback or questions on this document should be directed to the user’s national standards body. A
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complete listing of these bodies can be found at www.iso.org/members.htmlwww.iso.org/members.html.
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Introduction
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This document is a part of a series of International Standards concerning piping systems of various materials
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used for the rehabilitation of existing pipelines in a specified application area. System Standards for
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rehabilitation deal with the following applications:
— — ISO 11300 series: Piping systems for rehabilitation of underground drains, sewers and water supply
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networks; Adjust space between Asian text and numbers, Tab
stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
— — ISO 11301 series: Piping systems for rehabilitation of underground gas supply networks. 3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
The ISO 11300 and ISO 11301 series are subdivided into parts each covering a specific material or class of
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material of the piping system.
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ISO 11300 series is subdivided into four parts:
— — Part 1: Polyethylene (PE) material;
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— — Part 2: Thermoset composite materials (this document); stops: Not at 0.7 cm + 1.4 cm + 2.1 cm + 2.8 cm +
3.5 cm + 4.2 cm + 4.9 cm + 5.6 cm + 6.3 cm + 7 cm
— — Part 3: PVC-U material;
— — Part 4: Thermoplastic composite materials.
These documents cover various techniques for renovation and trenchless replacement. Furthermore, they are
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distinguished from those for conventionally installed plastics piping systems by the requirement to verify
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certain characteristics in the “as-installed condition”, after site processing. This is in addition to specifying
requirements for piping system components “as manufactured”.
A consistent structure of clause headings has been adopted for all parts of the ISO 11300 series and the ISO
11301 series, in order to facilitate direct comparisons across rehabilitation technique families.
Figure 1Figure 1 shows the clause structure and the relationship between the ISO 11300 series and the ISO
11301 series.
For complementary information, see ISO 11295.
For assessment of conformity to the requirements of this document, see ISO/TS 23818-2.
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x © ISO #### 2026 – All rights reserved
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ISO /FDIS 11300-2:2026(Een) Formatted: Font: 11 pt, Bold
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a
In preparation.
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Figure 1
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a
In preparation.
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Figure 1 — Clause structure of the ISO 11300 series and the ISO 11301 series
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The various techniques for rehabilitation of underground drains and sewers and water supply networks,
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within the scope of pipeline rehabilitation techniques generally, are shown schematically in Figure 2.Figure 2.
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© ISO 2026 – All rights reserved
xi
ISO #####-#:####(X/FDIS 11300-2:2026(en) Formatted: Font: 11 pt, Bold
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For definitions of standardized renovation and replacement techniques shown in Figure 2,Figure 2, but
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outside the scope of this document, see ISO 11295.

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This document is applicable, for piping systems made from thermoset composite materials.
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xii © ISO #### 2026 – All rights reserved
xii
ISO /FDIS 11300-2:2026(Een) Formatted: Font: 11 pt, Bold
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a
This document is applicable, for piping systems made from thermoset composite materials.
Figure 2 — Technique families for renovation of underground drains, sewers and water supply
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networks using plastics pipes, within the scope of pipeline rehabilitation techniques
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numbers
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© ISO 2026 – All rights reserved
xiii
ISO /FDIS 11300-2:2026(Een) Formatted: Font: 11 pt, Bold
Formatted: Font: 11 pt, Bold
Formatted: Font: 11 pt, Bold
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Piping systems for rehabilitation of underground drains, sewers and
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water supply networks — —
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Part 2:
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Thermoset composite materials
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1 Scope
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This document specifies requirements and test methods for pipes and fittings which are part of piping systems
distance from edge: 0.5 cm
for the rehabilitation of underground non-pressure and pressure drains and sewers, and of water supply
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networks which transport water intended for human consumption, including raw water intake pipelines.
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ItThis document is applicable to the renovation technique family "lining with cured-in-place pipes (CIPP)". It
is not applicable to lining with discrete pipes or lining with pipe segments using glass-reinforced
thermosetting plastics (GRP) material, as defined by ISO 11295.
It is not applicable to short lengths of CIPP used for patch repair only of local pipe defects.
It applies to the use of thermoset composite materials with various thermosetting resin systems, in
combination with compatible fibrous carrier materials, rei
...