ANNEX VIIIMethods for the quantitative analysis of binary and ternary textile fibre mixtures

(referred to in Article 19(1))

CHAPTER 2

METHODS FOR QUANTITATIVE ANALYSIS OF CERTAIN BINARY TEXTILE FIBRE MIXTURES

IV.Special methods

METHOD No 7

F1CERTAIN CELLULOSE FIBRES AND CERTAIN OTHER FIBRES

(Method using 75 % m/m sulphuric acid)

3.APPARATUS AND REAGENTS (other than those specified in the general instructions)

3.2.Reagents

(a)Sulphuric acid, 75 ± 2 % m/m

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 solution

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