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ANNEX VIIIU.K. Methods for the quantitative analysis of binary and ternary textile fibre mixtures (referred to in Article 19(1))

CHAPTER 2U.K.

METHODS FOR QUANTITATIVE ANALYSIS OF CERTAIN BINARY TEXTILE FIBRE MIXTURES U.K.

IV. Special methods U.K.
METHOD No 7U.K. [F1CERTAIN CELLULOSE FIBRES AND CERTAIN OTHER FIBRES U.K. (Method using 75 % m/m sulphuric acid)] U.K.
3.APPARATUS AND REAGENTS (other than those specified in the general instructions)U.K.
3.2.ReagentsU.K.
(a)Sulphuric acid, 75 ± 2 % m/mU.K.

Prepare by adding carefully, while cooling, 700 ml of sulphuric acid (relative density at 20 °C: 1,84) to 350 ml of distilled water.

After the solution has cooled to room temperature, dilute to 1 litre with water.

(b)Ammonia, dilute solutionU.K.

Dilute 80 ml of ammonia solution (relative density at 20 °C: 0,880) to 1 litre with water.