ISO 8606:2025

International
Standard
ISO 8606
Second edition
Fibre-reinforced plastics — Bulk
2025-07
moulding compound (BMC) and
dough moulding compound (DMC)
— Requirements and specifications
Plastiques renforcés de fibres — Préimprégnés en masse BMC et
DMC — Exigences et spécifications
Reference number
© ISO 2025
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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 BMC and DMC . 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 Other components .4
4.2.4 Recycling .4
4.3 Classification based on linear shrinkage .4
4.3.1 General-purpose BMC or DMC .4
4.3.2 Low-shrink BMC or DMC .5
4.3.3 Very-low-shrink (low profile) BMC or DMC .5
4.3.4 Zero-shrink BMC or DMC .5
5 Designation of BMC and DMC . 5
5.1 General .5
5.2 Examples of designations .5
6 Properties . 6
6.1 General .6
6.2 Properties to describe BMC or DMC (for the acceptance test) .6
6.2.1 Physical and chemical properties .6
6.2.2 Appearance .6
6.3 Properties to describe moulded specimens .7
6.3.1 General .7
6.3.2 Mechanical properties . .7
6.3.3 Physical properties.7
6.3.4 Electrical properties .7
7 Sampling . 8
7.1 Sampling procedure .8
7.2 Conditioning of sample .8
8 Shelf life . 8
9 Packaging and marking . 8
9.1 Packaging .8
9.2 Marking .8
Bibliography .10

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 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)
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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 second edition cancels and replaces the first edition (ISO 8606:1990), which has been technically
revised.
The main changes are as follows:
— the title has been modified from “Plastics — Prepregs — Bulk moulding compound (BMC) and dough
moulding compound (DMC) — Basis for a specification” to “Fibre-reinforced plastics — Bulk moulding
compound (BMC) and dough moulding compound (DMC) — Requirements and specifications”;
— fibre type and shrinkage code have been added;
— the designation of BMC or DMC has been added;
— test properties have 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 8606:2025(en)
Fibre-reinforced plastics — Bulk moulding compound (BMC)
and dough moulding compound (DMC) — Requirements and
specifications
1 Scope
This document establishes requirements and specifications of the bulk moulding compound (BMC) and
dough moulding compound (DMC) with or without thickening agents.
This document is applicable to BMC and DMC, which are different types of preimpregnated product used for
the production, by moulding, of various parts made of composite materials.
The scope is not limited to types of fibres and resins.
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, 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, 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 (all parts), Plastics — Methods for determining the density of non-cellular plastics
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 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 19927, Fibre-reinforced plastic composites — Determination of interlaminar strength and modulus by
double beam shear test
ISO 22821, Carbon-fibre-reinforc
...