ISO 8605:2024

Fibre-reinforced plastics — Sheet moulding compound (SMC) — Requirements and specifications

This document establishes requirements and specifications for sheet moulding compound (SMC) used in the production of composite parts by hot moulding. It is suitable for sheet moulding compound with glass fibres (GF) and carbon fibres (CF) as the sole or main reinforcement. Other fibre (e.g. natural fibre) reinforced sheet moulding compounds can also be used with this document.

Plastiques renforcés de fibres — Préimprégnés en feuille SMC — Exigences et spécifications

General Information

• Status: Published
• Publication Date: 29-Feb-2024
• ICS: 83.120 - Reinforced plastics
• Technical Committee: ISO/TC 61/SC 13 - Composites and reinforcement fibres
• Drafting Committee: ISO/TC 61/SC 13 - Composites and reinforcement fibres
• Current Stage: 6060 - International Standard published
• Start Date: 01-Mar-2024
• Due Date: 18-Jul-2025
• Completion Date: 01-Mar-2024

Relations

• Revises: ISO 8605:2001 - Textile-glass-reinforced plastics — Sheet moulding compound (SMC) — Basis for a specification
• Effective Date: 06-Jun-2022

Standards Content (Sample)

International
Standard
ISO 8605
Third edition
Fibre-reinforced plastics — Sheet
2024-03
moulding compound (SMC) —
Requirements and specifications
Plastiques renforcés de fibres — Préimprégnés en feuille SMC —
Exigences et spécifications
Reference number
© ISO 2024
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification of SMC . 3
4.1 General .3
4.2 Classification based on composition .3
4.2.1 Resin (matrix) .3
4.2.2 Reinforcement(s) .4
4.2.3 Modes of reinforcement .4
4.2.4 Fillers .5
4.2.5 Additives .5
4.3 Classification based on shrinkage behaviour .5
4.3.1 General-purpose SMC .5
4.3.2 Low-shrinkage SMC .6
4.3.3 Low-profile SMC .6
4.3.4 Class A SMC.6
5 Designation of SMC . 6
5.1 General .6
5.2 Examples of designations .6
6 Properties . 7
6.1 General .7
6.2 Properties to describe SMC (for the acceptance test).7
6.2.1 Physical and chemical characteristics .7
6.2.2 Appearance .7
6.3 Properties to describe moulded specimens .8
6.3.1 General .8
6.3.2 Mechanical properties . .8
6.3.3 Physical properties.8
6.3.4 Electrical properties .9
7 Sampling . 9
7.1 Sampling procedure .9
7.2 Conditioning of sample .10
8 Shelf life . 10
9 Packing, packaging and labelling .10
9.1 Packing .10
9.2 Packaging .10
9.3 Labelling .10
Bibliography .12

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 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 document 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 61, Plastics, Subcommittee SC 13, Composites
and reinforcement fibres.
This third edition cancels and replaces the second edition (ISO 8605:2001), which has been technically
revised.
The main changes are as follows:
— the title has been modified from "Textile-glass-reinforced plastics — Sheet moulding compound (SMC)
— Basis for a specification" to " Fibre-reinforced plastics — Sheet moulding compound (SMC) —
Requirements and specifications";
— fibre type and shrinkage code have been added;
— the designation of SMC has been added;
— test properties have been added;
— sampling position has been added.
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 8605:2024(en)
Fibre-reinforced plastics — Sheet moulding compound (SMC)
— Requirements and specifications
1 Scope
This document establishes requirements and specifications for sheet moulding compound (SMC) used in the
production of composite parts by hot moulding.
It is suitable for sheet moulding compound with glass fibres (GF) and carbon fibres (CF) as the sole or main
reinforcement. Other fibre (e.g. natural fibre) reinforced sheet moulding compounds can also be used with
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 62:2008, Plastics — Determination of water absorption
ISO 75-2:2013, Plastics — Determination of temperature of deflection under load — Part 2: Plastics and ebonite
ISO 179-1, Plastics — Determination of Charpy impact properties — Part 1: Non-instrumented impact test
ISO 179-2, Plastics — Determination of Charpy impact properties — Part 2: Instrumented impact test
ISO 180, Plastics — Determination of Izod impact strength
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 472, Plastics — Vocabulary
ISO 527-4:2023, Plastics — Determination of tensile properties — Part 4: Test conditions for isotropic and
orthotropic fibre-reinforced plastic composites
ISO 1172, Textile-glass-reinforced plastics — Prepregs, moulding compounds and laminates — Determination of
the textile-glass and mineral-filler content using calcination methods
ISO 1183-1, Plastics — Methods for determining the density of non-cellular plastics — Part 1: Immersion method,
liquid pycnometer method and titration method
ISO 1183-2, Plastics — Methods for determining the density of non-cellular plastics — Part 2: Density gradient
column method
ISO 1183-3, Plastics — Methods for determining the density of non-cellular plastics — Part 3: Gas pyknometer
method
ISO 1268 (all parts), Fibre-reinforced plastics — Methods of producing test plates
ISO 2577, Plastics — Thermosetting moulding materials — Determination of shrinkage
ISO 4589-2, Plastics — Determination of burning behaviour by oxygen index — Part 2: Ambient-temperature
test
ISO 9782, Plastics — Reinforced moulding compounds and prepregs — Determination of apparent volatile-
matter content
ISO 10352, Fibre-reinforced plastics — Moulding compounds and prepregs — Determination of mass per unit
area and fibre mass per unit area
ISO 11359-2, Plastics — Thermomechanical analysis (TMA) — Part 2: Determination of coefficient of linear
thermal expansion and glass transition temperature
ISO 11667, Fibre-reinforced plastics — Moulding compounds and prepregs — Determination of resin, reinforced-
fibre and mineral-filler content — Dissolution methods
ISO 12114, Fibre-reinforced plastics — Thermosetting moulding compounds and prepregs — Determination of
cure characteristics
ISO 12115, Fibre-reinforced plastics — Thermosetting moulding compounds and prepregs — Determination of
flowability, maturation and shelf life
ISO 14125, Fibre-reinforced plastic composites — Determination of flexural properties
ISO 14126, Fibre-reinforced plastic composites — Determination of compressive properties in the in-plane
direction
ISO 14127, Carbon-fibre-reinforced composites — Determination of the resin, fibre and void contents
ISO 14130, Fibre-reinforced plastic composites — Determination of apparent interlaminar shear strength by
short-beam method
ISO 17771, Plastics — Thermoset moulding compounds — Determination of the degree of fibre wetting in SMC
ISO 22821, Carbon-fibre-reinforced composites — Determination of fibre weight content by thermogravimetry
(TG)
ISO 22836, Fibre-reinforced composites — Method for accelerated moisture absorption and supersaturated
conditioning by moisture using sealed pressure vessel
IEC 60112, Method for the determination of the proof and the comparative tracking indices of solid insulating
materials
IEC 60243 (all parts), Electric strength of insulating materials — Test methods
IEC 60695-2-12, Fire hazard testing — Part 2-12: Glowing/hot-wire based test methods — Glow-wire
flammability index (GWFI) test method for materials
IEC 60695-11-10, Fire hazard testing — Part 11-10: Test flames — 50 W horizontal and vertical flame test
methods
IEC 61621, Dry, solid insulating materials — Resistance test to high-voltage, low-current arc discharges
IEC 62631-2-1, Dielectric and resistive properties of solid insulating materials — Part 2-1: Relative permittivity
and dissipation factor — Technical Frequencies (0,1 Hz - 10 MHz) — AC Methods
IEC 62631-3-1, Dielectric and resistive properties of solid insulating materials — Part 3-1: Determination of
resistive properties (DC methods) — Volume resistance and volume resistivity — General method
IEC 62631-3-2, Dielectric and resistive properties of solid insulating materials — Part 3-2: Determination of
resistive properties (DC methods) — Surface resistance and surface resistivity
EN 1842, Plastics — Thermoset moulding compounds (SMC - BMC) — Determination of compression moulding
shrinkage
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472 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
...