ISO 10119-2020 pdf free download – Carbon fibre — Determination of density.
This document specifies four methods for the determination of the density of carbon fibre tested as ayarn:
method A: liquid-displacement method;method B: sink /float method;
method C: density-gradient column method;- method D: gas pycnometer method.
Method C is the reference method in cases of dispute, etc.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document. For dated references, only the edition cited applies. Forundated references, the latest edition of the referenced document (including any amendments) applies.
a
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 1675,Plastics —Liquid resins —Determination of density by the pyknometer methodISO 10548,Carbon fibre — Determination of size content
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
lS0 and lEC maintain terminological databases for use in standardization at the following addresses:-Iso online browsing platform: available at https:.//www.iso.org/obp
—IEC Electropedia: available at http://www.electropedia.org/
3.1
density
mass per unit volume of a substance at a specified temperature
Note 1 to entry:This property is expressed in grams per cubic centimetre or in kilograms per cubic metre at thespecified temperature.The recommended temperature is 23C.
4 Test specimens – General requirements
Test specimens shall be taken from desized samples unless otherwise agreed between the supplier andthe customer. To remove the size, use the solvent extraction, chemical digestion or pyrolysis methodspecified in IS0 10548. The determination of the density may also be carried out on sized fibre byagreement between customer and supplier. The density of sized fibre may be taken to be identical tothat of unsized fibre when the size content is low.
5 Conditioning and test conditions
Before testing, test specimens shall be conditioned in a standard test atmosphere as specified inISO 291.During the test, the test apparatus and specimens shall be maintained at the same conditionsas used for conditioning.The preferred conditions are (23± 2) Cand (50±10) % relative humidity.
6 Test methods
6.1 Method A: Liquid-displacement method6.1.1 Principle
A specimen is weighed in air and then in a liquid which completely wets out the specimen and whichhas a known density at least 0,2 g/cm3 less than that of the specimen.The difference in weight of thespecimen in the two media is due to the Archimedean upthrust.
6.1.2Apparatus and materials
6.1.2.1 Analytical balance, readable to 0,1 mg, with a maximum permissible error of 0,5 mg, and witha range from 0 g to 100 g.
6.1.2.2 Suspension wire, made of stainless steel, of diameter 0,4 mm or less, or a specimen support,made of glass or stainless steel, with perforations so that it can be immersed easily in the immersionliquid (see Figure 1).
6.1.2.3 Pycnometer or hydrometer, maximum permissible error 0,001 g/cm 3 .
6.1.2.4 Beaker, made of borosilicate glass.
6.1.2.5 Vacuum pump (optional).ISO 10119 pdf download.