Textiles—Quantitative chemical analysis—Part 17:Mixtures of chlorofibers(homopolymers of vinyl chloride)and certain other fibers(method using sulfuric acid)
This part of GBT 2910 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 (ρ = 1, 84 g/ml).]
This method can be used, particularly in place of the methods described in GBT 2910.12 and GBT 2910.13, 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.
Contents Foreword I 1 Scope 2 Normative References 3 Principle 4 Reagents 5 Apparatus 6 Test Procedure 7 Calculation and Expression of Results 8 Precision Bibliography
