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International
Standard
ISO 14127
Second edition
Carbon-fibre-reinforced
2024-07
composites — Determination of the
resin, fibre and void contents
Composites renforcés de fibres de carbone — Détermination des
teneurs en résine, en fibre et en vide
Reference number
© ISO 2024
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ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Test specimens — General requirements . 2
5 Conditioning . 2
6 Method A: Resin removal method .3
6.1 Principle .3
6.1.1 Procedure A1: Combustion procedure .3
6.1.2 Procedure A2: Nitric acid digestion procedure .3
6.1.3 Procedure A3: Digestion in a sulfuric acid/hydrogen peroxide mixture .3
6.2 Apparatus and reagents .3
6.2.1 General .3
6.2.2 Procedure A1 .3
6.2.3 Procedure A2 .4
6.2.4 Procedure A3 .4
6.3 Test specimen .4
6.4 Procedure .5
6.4.1 Density measurements .5
6.4.2 Procedure A1 .5
6.4.3 Procedure A2 .6
6.4.4 Procedure A3 .7
6.5 Expression of results . .8
7 Method B: Thickness measurement method .9
7.1 Principle .9
7.2 Apparatus and materials .9
7.3 Test specimen .9
7.4 Procedure .9
7.5 Expression of results .9
8 Method C: Microscopic method . 10
8.1 Principle .10
8.1.1 Procedure C1: Determination of fibre volume content .10
8.1.2 Procedure C2: Determination of areal void content .10
8.2 Apparatus and materials .10
8.2.1 General .10
8.2.2 Procedure C1 .11
8.2.3 Procedure C2 .11
8.3 Test specimen .11
8.3.1 General .11
8.3.2 Specimen preparation .11
8.4 Procedure . 12
8.4.1 Procedure C1 . 12
8.4.2 Procedure C2: . 12
8.5 Expression of results . . 13
9 Precision . 14
10 Test report .15
Bibliography .16
iii
Foreword
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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 14127:2008), which has been technically
revised.
The main changes are as follows:
— the new method: Method C (microscopic method) as means to determinate fibre content by volume and
areal void content has been added;
— technical details related to the new method have been edited;
— procedure A3 has been modified by replacing the heating plate, beaker and watch glass with a heating
mantle and round bottom flask;
— in subclauses 4.3,6.3 and 7.3, where provisions for the number of test samples per assessment have been
newly added;
— “m ” has been corrected to “ϕ ” in Formula (4).
r r
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
Introduction
The constituent contents such as fibre content, resin content as well as void content are parameters
characterize physical/structural properties of carbon-fibre-reinforced composites. Such properties are
proven to have influence on mechanical performances of carbon-fibre-reinforced composites; thus, the
constituent contents are always required as important index for processing quality control.
Microscopic method calculates the fibre volume content/areal void content from measured fibre area/void
area and the area of cross-section of a specimen. The principle of this method differs from method A or B,
so that me
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