1.1 This standard prescribes methods for determination of pH value of aqueous extracts of textiles. The methods are applicable to textile in any form ( fibres, yarns or fabrics ) provided, that a small representa-tive sample may be obtained which is in or may be reduced to, a form which permits a ready exchange of liquid between the interior of the material and the water used in preparing the extract.
1.2 Two methods of preparation of aqueous extracts have been prescribed in this standard. For kier-boiled or scoured and bleached textile materials which have not been finished, pH values of aqueous
extracts prepared by the cold method and by the hot method would be the same. Hence any one of the methods may be followed. However, for finished or proofed fabrics the two values may differ depending upon the nature of finish or proofing of the fabrics; in such cases pH values of cold extract as well as hot extract ihould be separately determined.
IS 1390-1983 history
1984IS 1390-1983 Method for determination of pH value of aqueous extracts of textile materials