(ISO NTERNATIONAL STANDARD 3072 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION -MEK.IYHAPOAHA OPTAHM3ALMS IO CTAHIAPTW3ALIWM.ORGANISATION INTERNATIONALE DE NORMALISATION Wool -- Determination of solubility in alkali Laine-Determinationdela solubilite enmilieualcalin First edition -1975-12-15 ISO 3072-1975 (E) UDC 677.31 : 677.014.53 : 54-36 Ref.No.ISO3072-1975(E) Descriptors : wool, wool fibres, tests, measurement, solubility, alkaline conditions, volumetric analysis. Price based on 2 pages FOREWORD Iso (the International Organization for Standardization) is a worldwide federation of national standards institutes (Iso Member Bodies). The work of developing International Standards is carried out through ISO Technical Committees. Every up has the right to be represented on that Committee. International organizations, governmental and non-governmental, in liaison with iso, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards bytheisOCouncil. International Standard ISO3072 was drawnupby Technical Committee ISO/TC 38, Textiles, and circulated to the Member Bodies in October 1974. It has been approved by the Member Bodies of the following countries : Australia Hungary Romania Belgium India South Africa, Rep. of Bulgaria Iran Spain Canada Ireland Sweden Chile Israel Turkey Czechoslovakia Japan United Kingdom Denmark Netherlands U.S.A. Finland New Zealand U.S.S.R. Germany Poland Yugoslavia No Member Body expressed disapproval of the document. This International Standard is based on Test Method IWTO-4-60, drawn up by the International Wool Textile Organization (IWTO). InternationalOrganizationforStandardization,1975 Printed in Switzerland ISO3072-1975(E) INTERNATIONALSTANDARD Wool -- Determination of solubility in alkali O INTRODUCTION 4.3Dichloromethane The solubility of wool in alkali provides a useful index of WARNING. Dichloromethane is toxic; the room in which the extent of the change in its chemical properties brought extractions are made shall be adequately ventilated. about by certain agencies. Treatment with acids, oxidizing or reducing agents and exposure to heat or light cause an increase in the solubility, whereas treatment with alkalis or 5 APPARATUS cross-linking agents causes the solubility to decrease. The change in solubility is thus a measure of the severity of the 5.1 Soxhlet extraction apparatus. treatment. 5.2 Water-bath, thermostatically controlled at 65 ± 0,5 °c. To ensure uniform temperature, the water must be stirred. SCOPEANDFIELDOFAPPLICATION 5.3 Stoppered flasks with a working capacity of 100 ml, This International Standard specifies a method for of the same shape and wall thickness. determining the solubility of wool in alkali. The method is applicable to wool textiles in any form, 5.4 Sintered-glass filtering crucibles, 30 ml capacity. namelyloose fibre,sliver,roving,yarn or cloth.Thetestis porosity 1. If possible, these crucibles should have ground most useful when an untreatedcontrol sample is available glass stoppers. If ground glass stoppers are not available, the and when the nature of the treatment of the sample under crucibles shall be enclosed in weighing bottles for test is known, i.e. as a method of control. When the sample determination of their masses. has been treated by two agencies having opposite effects on the solubility, the interpretation of the results, even when 5.5 Filter-flask, filter-pump, and adaptor to enable the anuntreated control sample is available, is difficult and crucibles to be fitted to the filter-flask. may be misleading. 2REFERENCES 5.7 Stoppered weighing bottles for obtaining the masses of ISO1130,Textile fibres- Somemethods of samplingfor test specimens. testing. 5.8 Analytical balance, accurate to 0,000 2 g. ISO 3071, Wool - D Determination of the pH value of the aqueous extract. 5.9 Desiccator. IS0 3073, Wool - Determination of