ISO/FDIS 19374

ISO/DISFDIS 19374:2025(en)
ISO/TC 61/SC 13
Secretariat: JISC
Date: 2025-07-252026-03-19
Recycled carbon fibres — Designation system for recycled carbon
fibres
Fibres de carbone recyclées — Système de désignation des fibres de carbone recyclées
FDIS stage
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© ISO #### 2026 – All rights reserved
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ISO/DISFDIS 19374:20252026(en)
Contents
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Designation system . 2
4.1 General . 2
4.2 Data block 1 (Identification) . 3
4.3 Data block 2 (Product physical information) . 4
4.4 Data block 3 (Sizing information) . 5
4.5 Data block 4 (Mechanical properties of the product) . 5
4.6 Data block 5 (Optional block). 7
5 Example of a designation . 7
5.1 Designation with four data blocks . 7
5.2 Designation with five data blocks . 8
Annex A (informative) Illustration of the source of carbon fibre recyclates . 10

iii
Foreword
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This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 13, Composites
and reinforcement fibres.
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© ISO #### 2026 – All rights reserved
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ISO/DISFDIS 19374:20252026(en)
Introduction
Carbon fibres are applied for the reinforcement of polymers or other materials. In particular, the recycled
carbon fibres are being highly durable and have limited degradation through recycling, their reuse for
adaption to circular economy is of much value. This designation system of recycled carbon fibres is necessary
to clearly specify the identification of essential characteristics of recycled carbon fibres.
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DRAFT International Standard ISO/DIS 19374:2025(en)

Recycled carbon fibres — Designation system for recycled carbon
fibres
1 Scope
1.1 1.1 This document establishes a designation system of recycled carbon fibres, which can be used
as the basis for specification.
1.2 1.2 This designation system is applicable to recycled carbon fibres used for polymer composites.
1.3 1.3 The types of recycled carbon fibres are differentiated by a designation system based on
appropriate levels of the designatory properties:
a) a) tensile modulus of elasticity.
b) b) tensile strength.
NOTE One to five designatory property(s) that differentiate recycled carbon fibre types from each other is (are)
assigned.
1.4 1.4 It is not intended to imply that recycled carbon fibres having the same designation will give the
same performance. This document does not provide engineering data or data on processing conditions that
can be required to specify materials for a particular and/or method of processing.
1.5 1.5 In order to specify recycled carbon fibres for a particular application, additional requirements can
beare given in optional data block 5 (see 4.64.6))
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 6989, Textile fibres — Determination of length and length distribution of staple fibres (by measurement of
single fibres)
ISO 11566:1996, Carbon fibre — Determination of the tensile properties of single-filament specimens
ISO 19350, Recycled carbon fibre — Determination of tensile strength distribution and interfacial shear strength
of single filament embedded in matrix polymer
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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 3.1
recycled carbon fibre
rCF
Carboncarbon fibres recovered through a recycling process that retains usable properties.
3.2 3.2
dry rCF
DrCF
waste from pre-consumer carbon fibres and from a part of woven and non-woven fabric (without uncured or
cured matrix, only fibres)
NOTE Note 1 to entry: See Figure A.1Figure A.1
3.3 3.3
post-industrial carbon fibre recyclate
PIR
carbon fibres reclaimed after their intended use by industries
NOTE Note 1 to entry: See Figure A.1Figure A.1
3.4 3.4
post-consumer carbon fibre recyclate
PCR
carbon fibres reclaimed after their intended use by consumers
NOTE Note 1 to entry: See Figure A.1Figure A.1
3.5 3.5
unprocessed PIR rCF
UPIrCF
waste from thermoset or thermoplastic based prepreg
NOTE Note 1 to entry: See Figure A.1Figure A.1
3.6 3.6
processed PIR rCF
PIrCF
waste from thermoset or thermoplastic based PIR CFRP
NOTE Note 1 to entry: See Figure A.1Figure A.1
3.7 3.7
processed PCR rCF
PCrCF
waste from thermoset or thermoplastic based PCR CFRP
NOTE Note 1 to entry: See Figure A.1Figure A.1
4 Designation system
4.1 General
The designation system for recycled carbon fibres is based on the standardized pattern given in Table 1Table
1.
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ISO/DISFDIS 19374:20252026(en)
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