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ISO 1833-25-2013 pdf free download

ISO 1833-25-2013 pdf free download.Textiles Quantitative chemical analysis Part 25:Mixtures of polyester and certain other fibres (method using trichloroacetic acid and chloroform)
Textiles — Analyse chimique quantitative — Partie 25: Mélanges de polyester et de certaines autres fibres (méthode a l’acide trichloracétique et au chioroforme).
This part of ISO 1833 specifies a method using trichioroacetic acid and chloroform to determine the percentage of polyester fibres after removal of non-fibrous matter, in textiles made of binary mixtures of polyester fibres with other fibres, except one type of aramid (polyamide imide), polyamide, chiorolibre and modacrylic.
2 Normative references
The following referenced documents are indispensable for the application 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 1833-1, Textiles — Quantitative chemical analysis — Part 1: General principles of testing
3 Principle
The polyester fibre is dissolved out from a known dry mass of the mixture, with a reagent composed of trichloroacetic acid and chloroform. The residue is collected, washed, dried and weighed; its mass, corrected if necessary, is expressed as a percentage of the dry mass of the mixture. The percentage of polyester is found by difference.
4 Reagents
Use the reagents described in ISO 1833-1, together with those specified in 4I.. 42 and 4.
4.1 Solution of crystallized trichioroacetic acid/chloroform reagent, prepared at a mass ratio 1:1.
SAFETY PRECAUTIONS — The harmful effects of this reagent shall be borne in mind, and full
precautions shall be taken during use.
4.2 SolutIon of 15 g of trlchloroacetic acid filled up to 100 g with chloroform.
4.3 Chloroform.
5 Apparatus
Use the apparatus described in ISO 1833-1, together with that described in £1.
5.1 Conical flask, of minimum capacity of 200 ml, glass stoppered.
6 Test procedure
Follow the general procedure described in ISO 1833-1, and then proceed as follows.
6.1 Place the specimen in the conical flask.
6.2 Add 50 ml of trichloroacetic acid/chloroform reagent (4.1) per gram of specimen.
6.3 Stopper the conical flask and shake it vigorously.
6.4 Allow the flask and contents to remain for 15 mm, shaking it during this time at intervals.
6.5 Decant the liquid through the weighed filter crucible with suction.
6.6 Pour 100 ml of trichloroacetic acid/chloroform reagent (4.1) into the conical flask, decant the liquid through the filter crucible, and then transfer any residual fibres to the crucible by washing out the conical flask with the trichloroacetic acid/chloroform solution (4.2) followed by chloroform (4.3).
6.7 Drain the crucible with suction. Do not apply suction until the washing liquor has drained under gravity.
6.8 Finally, drain the crucible with suction, dry the crucible and residue, cool and weigh them.
6.9 Check the residue under a microscope to see if the treatment completely eliminated the soluble fibre.
7 Calculation and expression of results
Calculate the results as described in the general instructions of ISO 1833-1.
The value of the correction factor of variation in mass of insoluble component in the reagent (d) is 1,02 and 1,00 for cotton and aramid, respectively.ISO 1833-25-2013 pdf free download.

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