ISO 24260:2022

Thermal insulation products - Hemp fiber mat and board - Specification

This document specifies requirements for factory-made products of hemp fibre, which are used for the thermal insulation of buildings. This document applies to material containing more than 50 % (by mass) natural hemp fibre, with or without the other natural fibre and the balance being polymeric material. The products are delivered as a mat or board with or without facings. This document describes product characteristics and testing methods, marking, labelling and packaging. Products covered in this document are also used in prefabricated thermal insulation systems and composite panels. The performance of systems incorporating these products is not covered. The use of moth proof agent residues is outside the scope of this document. This document does not address the health and safety aspects associated with its use. It is the responsibility of the user of this document to establish appropriate health and safety practices.

Produits d'isolation thermique — Panneaux et tapis en fibres de chanvre — Spécifications

General Information

• Status: Published
• Publication Date: 29-Jun-2022
• ICS: 91.100.60 - Thermal and sound insulating materials
• Technical Committee: ISO/TC 163/SC 3 - Thermal insulation products, components and systems
• Drafting Committee: ISO/TC 163/SC 3/WG 17 - Hemp fibre mat and board thermal insulation
• Current Stage: 6060 - International Standard published
• Start Date: 30-Jun-2022
• Due Date: 15-Jul-2022
• Completion Date: 30-Jun-2022

Relations

• Consolidated By: ISO 19403-6:2024 - Paints and varnishes - Wettability - Part 6: Measurement of dynamic advancing and receding angle by changing the volume of a drop
• Effective Date: 01-Jul-2023

Overview

ISO 24260:2022 - Thermal insulation products - Hemp fiber mat and board - Specification defines requirements for factory-made hemp‑based thermal insulation used in buildings. It applies to products containing >50% natural hemp fibre (by mass), with the remainder possibly other natural fibres and polymeric material. Products covered are delivered as hemp fibre mats (HFM) or hemp fibre boards (HFB), with or without facings, and include materials used in prefabricated insulation systems and composite panels. The standard describes product characteristics, testing methods, marking, labelling and packaging. Note: system performance, moth‑proof agent residues and health & safety practices are outside the standard’s scope.

Key technical topics and requirements

• Material scope: Products with >50% hemp fibre by mass, mat or board forms.
• Thermal performance: Measurement of thermal conductivity (λ) and thermal resistance (R) using ISO 8301 or ISO 8302 (guarded hot plate/heat flow meter). Specimens are conditioned at (23 ± 2) °C and (50 ± 5) % RH to constant mass. Declared values must represent at least 90% of production at 90% confidence (90/90).
  • λ values rounded up to 0.001 W/(m·K) steps; R values rounded down to 0.05 m·K/W steps.
• Dimensional tolerances: Length and width tested per ISO 29465; example tolerances: HFM length ±5 mm or ±0.4% (whichever larger), HFB length ±3 mm or ±0.4%; width tolerances typically ±2 mm or ±0.4%. Thickness measured per ISO 29466 (measured under 50 Pa).
• Other properties: Apparent density (ISO 29470), moisture content (ISO 12570), reaction to fire (ISO 11925‑2), sound absorption (ISO 354 / ISO 11654), formaldehyde release (ISO 12460‑1).
• Conformity & quality control: Initial type testing (ITT) and Factory Production Control (FPC) requirements are specified (see Annex B). Sampling and conditioning procedures are defined.

Practical applications and who uses it

• Manufacturers of hemp fibre mats and boards use ISO 24260:2022 to declare thermal properties, set production QC, and label products for the building market.
• Specifiers, architects and engineers rely on the declared λ and R values when selecting bio‑based insulation for walls, roofs and floors.
• Certification bodies and testing labs use the sampling, conditioning and measurement protocols for compliance testing and reporting.
• Prefab system and panel producers use the standard for component specification; note that combined system performance must be assessed separately.

Related standards (normative references)

Includes key referenced standards: ISO 8301, ISO 8302, ISO 29465, ISO 29466, ISO 29470, ISO 12570, ISO 11925‑2, ISO 12460‑1, ISO 354, ISO 11654, ISO 12576‑1.

Keywords: ISO 24260:2022, hemp fibre insulation, hemp fibre mat, hemp fibre board, thermal conductivity, thermal resistance, hemp insulation standard, testing methods, factory production control.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 24260
First edition
2022-06
Thermal insulation products — Hemp
fiber mat and board — Specification
Produits d'isolation thermique — Panneaux et tapis en fibres de
chanvre — Spécifications
Reference number
© ISO 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols, units and abbreviated terms . 2
4.1 Symbols and units . 2
4.2 Abbreviated terms and symbols used in designations. 3
5 Requirements . 3
5.1 General . 3
5.2 Material properties . 3
5.2.1 Thermal resistance and thermal conductivity . 3
5.2.2 Length and width . . 4
5.2.3 Thickness . 4
5.2.4 Service Temperature . 5
5.2.5 Reaction to fire. 5
5.2.6 Moisture content . 5
5.3 Specific requirements . 5
5.3.1 Apparent density . 5
5.3.2 Sound absorption . 5
5.3.3 Formaldehyde release. 5
6 Test methods . 6
6.1 Sampling . 6
6.2 Conditioning. 6
6.3 Procedure . 6
6.3.1 General . 6
6.3.2 Thermal resistance and thermal conductivity . 7
7 Designation code . . 7
8 Product conformity .8
8.1 General . 8
8.2 Initial type testing (ITT) . 8
8.3 Factory production control (FPC) . 8
9 Marking and labelling . 8
Annex A (normative) Determination of the declared values of thermal resistance and
thermal conductivity . .10
Annex B (normative) Factory production control (FPC) .12
Annex C (normative) Determination of the thermal conductivity in relation to moisture
content .13
Bibliography .15
iii
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
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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).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
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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 163, Thermal performance and energy use
in the built environment, Subcommittee SC 3, Thermal insulation products, components and systems.
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.
iv
INTERNATIONAL STANDARD ISO 24260:2022(E)
Thermal insulation products — Hemp fiber mat and board
— Specification
1 Scope
This document specifies requirements for factory-made products of hemp fibre, which are used for the
thermal insulation of buildings. This document applies to material containing more than 50 % (by mass)
natural hemp fibre, with or without the other natural fibre and the balance being polymeric material.
The products are delivered as a mat or board with or without facings.
This document describes product characteristics and testing methods, marking, labelling and
packaging.
Products covered in this document are also used in prefabricated thermal insulation systems and
composite panels. The performance of systems incorporating these products is not covered.
The use of moth proof agent residues is outside the scope of this document.
This document does not address the health and safety aspects associated with its use. It is the
responsibility of the user of this document to establish appropriate health and safety practices.
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 354, Acoustics — Measurement of sound absorption in a reverberation room
ISO 8301, Thermal insulation — Determination of steady-state thermal resistance and related properties
— Heat flow meter apparatus
ISO 8302, Thermal insulation — Determination of steady-state thermal resistance and related properties
— Guarded hot plate apparatus
ISO 9229, Thermal insulation — Vocabulary
ISO 11654, Acoustics — Sound absorbers for use in buildings — Rating of sound absorption
ISO 11925-2, Reaction to fire tests — Ignitability of products subjected to direct impingement of flame —
Part 2: Single-flame source test
ISO 12460-1, Wood-based panels — Determination of formaldehyde release — Part 1: Formaldehyde
emission by the 1-cubic-metre chamber method
ISO 12570, Hygrothermal performance of building materials and products — Determination of moisture
content by drying at elevated temperature
ISO 12576-1, Thermal insulation — Insulating materials and products for buildings — Conformity control
systems — Part 1: Factory-made products
ISO 29465, Thermal insulating products for building applications — Determination of length and width
ISO 29466, Thermal insulating products for building applications — Determination of thickness
ISO 29470, Thermal insulating products for building applications — Determination of the apparent density
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 9229 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
production line
equipment that produces products in a continuous process
Note 1 to entry: For initial type test (ITT) and factory production control (FPC), each production line is
considered separately.
3.2
production unit
equipment that produces products in a discontinuous process
Note 1 to entry: For initial type test (ITT) and factory production control (FPC), units using the same process in
one factory are considered together [as one production line (3.1)].
3.3
hemp fibre mat
HFM
soft matted material made from natural hemp fibre as the main (>50 % by mass) material with or
without the other natural fibre and the balance being polymeric material.
3.4
hemp fibre board
HFB
plate type products with certain degree of rigidity made from natural hemp fibre as the main (>50 % by
mass) material with or without the other natural fibre and the balance being polymeric material.
4 Symbols, units and abbreviated terms
4.1 Symbols and units
b width, mm
d thickness, mm
l length, mm
d nominal thickness of the product, mm
N
λ thermal conductivity, W/(m·K)
λ declared thermal conductivity, W/(m·K)
D
λ Specimen’s one test result of thermal conductivity, W/(m·K)
i
λ 90 % fractile with a confidence level of 90 % for the thermal conductivity, W/(m·K)
90/90
λ Specimens’ mean thermal conductivity, W/(m·K)
mean
H moisture content, %
k factor related to the number of test results available
R declared thermal resistance, m ·K/W
D
R specimen’s one test result of thermal resistance, m ·K/W
i
R mean thermal resistance, m ·K/W
mean
R 90 % fractile with a confidence level of 90 % for the thermal resistance, m ·K/W
90/90
ρ apparent density, kg/m
a
L declared class or level for length tolerances
T declared class or level for thickness tolerances
W declared class or level for width tolerances
4.2 Abbreviated terms and symbols used in designations
HFM hemp fibre mat
HFB hemp fibre board
ITT initial type test
FPC factory production control
5 Requirements
5.1 General
Product properties shall be determined in accordance with Clause 6.
The test methods to be used for determination of each property are given in Table 4, which also shows
the required test specimen dimensions and the minimum number of test specimens required to give
one test result.
One test result for a product property is the average of the measured values on the number of test
specimens given in Table 4.
NOTE For FPC, see Annex B.
5.2 Material properties
5.2.1 Thermal resistance and thermal conductivity
For thermal conductivity testing, the specimen shall be conditioned at (23 ± 2) °C and (50 ± 5) %
relative humidity to constant mass.
Thermal resistance and thermal conductivity shall be based upon measurements carried out in
accordance with ISO 8301 or ISO 8302 for thick products.
The thermal resistance and thermal conductivity shall be determined in accordance with the
procedures given in Annex A and declared by the manufacturer according to the following:
— The reference mean temperature shall be either 10 °C or 23 °C, or both.
— The measured values shall be expressed with three significant figures.
— For products of uniform thickness, the thermal resistance, R , shall always be declared. The thermal
D
conductivity, λ , shall be declared where possible. Where appropriate, for products of non-uniform
D
thickness (i.e. for sloped and tapered products), only the thermal conductivity, λ , shall be declared.
D
— The declared thermal resistance, R , and the declared thermal conductivity, λ , shall be given as
D D
limit values representing at least 90 % of the production, determined with a confidence level of
90 %.
— The value of the thermal conductivity, λ , shall be rounded up to the nearest 0,001 W/(m·K)
D 90/90
and declared as λ in levels with steps of 0,001 W/(m·K).
D
— The declared thermal resistance, R , shall be calculated from the nomina
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