Le présent fascicule de documentation reproduit, au chapitre 3, le texte intégral de la méthode n° 15 de la directive 72/276/CEE modifiée par la directive n° 81-75 CEE qui a ajouté cette méthode à l'annexe II partie 2 de la directive d'origine. La directive n° 81-75 du 17 février 1981 est parue au journal officiel de la communauté européenne L 57 page 25.
ISO 1833-17:2006 specifies a method, using sulfuric acid, to determine the percentage of chlorofibres, after removal of non-fibrous material, in textiles made of binary mixtures of chlorofibres based on homopolymers of vinyl chloride (after-chlorinated or not) and cotton, viscose, cupro, modal, acetate, triacetate, polyamide, polyester, certain acrylic and certain modacrylic fibres. [The modacrylics concerned are those which give a limpid solution when immersed in concentrated sulfuric acid (density 1,84 g/ml).] This method can be used, particularly in place of the methods described in ISO 1833-12 and ISO 1833-13, in all cases where a preliminary test shows that the chlorofibres do not dissolve completely either in dimethylformamide or in the azeotropic mixture of carbon disulfide and acetone.
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