Division 2 PRINCIPLEF1
United Kingdom
The silk or polyamide or nylon fibre is dissolved out from a known dry mass of the mixture, with 75 % m/m sulphuric acid f1 .
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 the dry silk or polyamide or nylon is found by difference.
Annotations
Textual amendments
Footnotes
- f1
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Wild silks, such as tussah silk, are not completely soluble in 75 % m/m sulphuric acid.
Notes on Division IV
Textual amendments
Footnotes
- f1
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Detailed list of fibres under each method.