# Regulation (EU) No 1007/2011 of the European Parliament and of the Council of 27 September 2011 on textile fibre names and related labelling and marking of the fibre composition of textile products and repealing Council Directive 73/44/EEC and Directives 96/73/EC and 2008/121/EC of the European Parliament and of the Council (Text with EEA relevance), Division 2: PRINCIPLE

Extent: E+W+S+N.I.

The constituent other than the chlorofibre, polypropylene, elastolefin, melamine or polypropylene/polyamide bicomponent (i.e. the fibres mentioned in paragraph 1.1) is dissolved out from a known dry mass of the mixture with concentrated sulphuric acid (relative density 1,84 at 20 °C). The residue, consisting of the chlorofibre, polypropylene, elastolefin, melamine or polypropylene/polyamide bicomponent 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 second constituents is obtained by difference.

---
Source: https://www.legislation.gov.uk/eur/2011/1007/annex/VIII/chapter/2/division/1/division/IV/division/14/division/2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2011-1007/annex-VIII/chapter-2/division-1/division-IV/division-14/division-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.