(ISo 673 International Standard nNsT Intarrof o soct Soaps -- Determination of content of ethanol-insoluble matter Savons - Détermination de la teneur en matieres insolubles dans I'éthanol Second edition - 1981-06-01 JUN 2 3 1981 UDC 661.185 : 543.868 Ref. No. 1SO 673-1981 (E) ISO 673-1981 (E) Descriptors : soaps, chemical analysis, determination of content, insoluble matter, impurities, ethanol Price based on 2 pages Copyright International Organization for Standardization Not for Resale Foreword ISo (the International Organization for Standardization) is a worldwide federation of national standards institutes (So member bodies). The work of developing Inter- national Standards is carried out through isoO technical committees. Every member 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 673 was developed by Technical Committee ISO/TC 91, Surfaceactiveagents. The ifirst edition (IS0 673-1974) had been approved by the member bodies of the following countries : Germany, F.R. Argentina Romania Hungary Austria South Africa, Rep. of Belgium Ireland Spain Brazil Israel Sweden Canada Japan Switzerland Chile Netherlands United Kingdom Colombia New Zealand Yugoslavia Egypt, Arab Rep. of Poland France Portugal No member body had expressed disapproval of the document. This second edition, which supersedes IsO 673-1974, incorporates draft Amend- with clause 5.10.1 of part 1 of the Directives for the technical work of Is0. @ International Organization for Standardization, 1981 Printed in Switzerland Copyright International Organization for Standardization Not for Resale INTERNATIONAL STANDARD ISO 673-1981 (E) Soaps -- Determination of content of ethanol-insoluble matter Scope and field of application Water bath. 5.3 This International Standard specifies a method for the deter- 5.4 Oven, capable of being controlled at 103 ± 2 oC. mination of the content of ethanol-insoluble matter in commer- cial soaps, excluding compounded products. 5.5 Analytical balance, accurate to 0,001 g. Definition 2 Sampling 6 For the purpose of this International Standard, the folliowing Procedures for the preparation and storage of the laboratory definition applies. sample will form the subject of a future International Standard. ethanol-insoluble matter : The matter not dissolved by the procedure specified in this International Standard. Procedure NOTES 7.1 Test portion The ethanol-insoluble matter corresponds to the additives and foreign matter, of low solubility or insoluble in 95 % (V/ V) ethanol, ad- ded to soaps, and also to substances in all soap formulations, such as Weigh, to the nearest 0,01 g, about 5 g of the laboratory sam- alkali carbonates and chlorides, of low solubility in 95 % (V/V) ple into a conical flask (5.1). etharrol. 2 The foreign matter may be inorganic (carbonates, borates, per- 7.2 Determination borates, chlorides, sulphates, silicates, phosphates, iron oxides, etc.) or organic (starches, dextrins, caseins, sugars, cellulose derivatives, Add 200 ml of the ethanol (4.1) to the test portion (7.1) in the alginates, etc.). conical flask and connect the reflux condenser (5.2). Heat to gentle boiling, swirling in order to avoid, as far as possi- Principle ble, material adhering to the bottom of the flask. Dissolution of the soap in ethanol, filtration and weighing of Dry the filter paper to be used for the filtration of the insoluble the undissolved residue. matter in the oven (5.4), controlled at 103 ± 2 oC, for 1 h Allow it to cool to ambient temperature in a desiccator and weigh it to the nearest 0,001 g. Place it in a funnel mounted on Reagent 4 a second conical flask (5.1). 4.1 Ethanol, 95 % (V/ V). When dissolutio