4615 OSI) International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOAHAA OPTAHM3ALMA NO CTAHAAPTM3ALMM·ORGANISATION INTERNATIONALE DE NORMALISATION Plastics Unsaturated polyesters and epoxide resins Determination of total chlorine content Plastiques -- Résines de polyesters non saturés et époxydes -- Détermination de la teneur totale en chlore First edition - 1979-12-01 UDC 678.674 + 678.685 : 543.848 Ref. No. ISO 4615-1979 (E) SO 4615-1979 (E) Descriptors : plastics, polyester resins, epoxy resins, chemical analysis, determination of content, chlorine, combustion analysis. Price based on 5 pages Copyright International Organization for Standardization ted without license from IHS Not for Resale 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 member body interested in a subject for which a technical committee has been set 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 by the ISO Council. International Standard ISO 4615 was developed by Technical Committee ISO/TC 61, Plastics, and was circulated to the member bodies in August 1978. It has been approved by the member bodies of the following countries : Hungary South Africa, Rep. of Austria Iran Sweden Belgium Bulgaria italy Switzerland Japan Turkey Canada Korea, Rep. of USA Czechoslovakia USSR Egypt, Arab Rep. of Mexico Netherlands Yugoslavia Finiand Germany, F.R. New Zealand Greece Romania The member body of the following country expressed disapproval of the document on technical grounds : United Kingdom International Organization for Standardization, 1979 : Printedin Switzerland ed without license from IHS Not for Resale INTERNATIONAL STANDARD ISO 4615-1979 (E) Plastics - Unsaturated polyesters and epoxide resins Determination of total chlorine content 1 SCOPE AND FIELD OF APPLICATION 3.3 Nitric acid, concentrated, p = 1,42 g/ml. 3.4 Sodium peroxide, granulated. determination of the total chlorine content of unsaturated polyesters and epoxide resins, namely : 3.5 Starch or sucrose as combustion aids. -method A : combustion in a bomb; For method B only : method B : combustion in a flask. 3.6 Oxygen, gaseous. NOTES 1 Determination of combined chlorine and bromine content or 3.7 Sodium nitrate. bromine content only, is also possible by these methods. The appropriate procedure shall be agreed upon by the purchaser and the supplier. 3.8 Potassium hydroxide solution, 100 g/l. 2 These methods are not applicable to the determination of tota chlorine in epoxy resins containing chlorine as an impurity. 3.9 Hydrogen peroxide solution, 300 g/l. 2 PRINCIPLE Oxidation of a test portion with sodium peroxide (method A) 4 APPARATUS or volumetric titration of the resulting chlorides. 4.1 Balancc, to wcigh to an accuracy of 0,000 1 g. 4.2 Equipment for Volhard titration or for electrometric 3 REAGENTS titration, with a burette having a capacity and accuracy appropriate to the chosen method (A or B). During the analysis, use only reagents of known analytical quality, and only distilled water or water of at least equival- For method A only : ent purity. 4.3 Combustion bomb (for example Parr bomb or another 3.1 Silver nitrate, standard volumetric solution, bomb which gives the same resuits),electrically fired or c(AgNOg) = 0,1 mol/l.1) gas-fired. A suitable gas-fired bomb is shown in figure 1. NOTE - For testing resins of low total chlorine content [less than 2 % (m/m)j, a standard yolumetric solution of silver nitrate, 4.4 Nickel crucible with lid, to fit into the bomb (gas- c(AgNO3) = 0,05 mol/