6836 (Iso International Standard INTE RNATIONAL ORGANIZATION FOR STANDARDIZATION+MEXAYHAPOAHAH OPrAHM3AWR IO CTAHAAPTW3AUWW+ORGANISATION INTE RNATIONALE DE NORMALISATION Surface active agents -- Mercerizing agents --- Evaluation of the activity of wetting products for mercerization by determination of the shrinkage rate of cotton Agents de surface -- Adjuvants de mercerisage -- Evaluation de I'activite des produits mouillants pour mercerisage par deéterminationde la vitesse de retraction du coton First edition 1983-02-01 UDC 661.185.7 : 620.1 : 677.017.635 Ref. No. 1SO 6836-1983 (E) ISO 6836-1983 (E) Descriptors : surfactants, tests, determination, wettability, mercerizing, shrinkage, Pricebased on5pages Copyright International Organization for Standardization Not for Resale Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of developing International Standards is carried out through iso technical committees. Every member body interested in a subject for which a technical committee has been authorized 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 by the iso Council. International Standard ISO 6836 was developed by Technical Committee ISO/TC 91, Surface active agents, and was circulated to the member bodies in March 1982. Austria Iran Poland Egypt, Arab Rep. of Italy Romania France Japan Spain Germany, F. R. Switzerland Mexico Hungary Netherlands USSR The member body of the following country expressed disapproval of the document on technical grounds : Belgium @ International Organization for Standardization, 1983 Printed in Switzerland Copyright International Organization for Standardization nse from IHS Not for Res INTERNATIONAL STANDARD ISO 6836-1983 (E) Surface active agents Mercerizing agents -- E Evaluation of the activity of wetting products for mercerization by determination of the shrinkage rate of cotton O Introduction 4 Principle Immersion in the liquor containing the agent being studied of a The effectiveness of strongly alkaline mercerizing liquor used for mercerization (or causticization) depends, amongst other hank of smooth cotton held by a hook and with a weight fixed things, on the rapidity with which the sodium hydroxide on the end of it. solution impregnates the material and penetrates into the cellulose fibre the swelling of which causes shrinkage in the Determination of the shrinkage of the hank at different intervals longitudinal direction of the fibre under tension which is of time using one of the two pieces of apparatus described. transmitted to the material and allows the mercerization effect as such to be achieved. In order to shorten the time required for penetration by the sodium hydroxide solution, special wetting 5 Reagents agents are added to the mercerizing or causticizing liquor. During the test, use only reagents of recognized analytical Scope and field of application 5.1 Sodium hydroxide solution, Q20 1,24 g/ml. This International Standard specifies a method for evaluating the activity of wetting products for mercerization by determi- Dissolve 270 g of sodium hydroxide in 1 litre of water. nation of the shrinkage rate of cotton threads. NOTE - For each agent to be examined 1,5 litres of sodium hydroxide The method is only applicable to mercerizing or causticizing solution are required. baths. Apparatus and material 6 Reference 2 Cotton yarn, the type and designation of which are 6.1 Iso 607, Surface active agents and detergents - Methods of exactly defined in the test report. For comparative tests, see the sample division. note. NOTE -- As the shrinking ability depends upon the type of raw cotton, 3 Definit