3.40 bh?1 (ISO 641 NTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARDIZATION·MEKIYHAPOIHA OPTAHM3ALIMA IO CTAHIAPTW3ALIHH·ORGANISATION iNTERNATIONALE DE NORMALISATION Laboratory glassware -- Interchangeable spherical ground joints Verrerie de laboratoire - Assemblages spheriques rodés interchangeables First edition - 1975-09-01 ANsI Inienat Doc Seet Betl 406 26 1975 UDC 542.231.7.004.1 Ref. No. 1SO 641-1975 (E) 641-1975 (E) Descriptors : laboratory glassware, joints (junctions), joining, geometrical characteristics, dimensions, diameters, interchangeability, tests, air tightness tests. Price based on 5 pages Copyright International Organization for Standardization nse 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 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. Prior to 1972, the results of the work of the Technical Committees were published transformed into International Standards. As part of this process, Technical Committee ISO/TC 48 has reviewed ISO Recommendation R 641 and found it technically suitable for transformation. International Standard ISO 641 therefore IsO Recommendation R 641 was approved by the Member Bodies of the following countries : Australia Greece Poland Austria Hungary South Africa, Rep. of Belgium India Spain Brazil Ireland Switzerland Canada Israel Turkey Chile United Kingdom Italy Colombia U.S.A. Japan Czechoslovakia Netherlands U.S.S.R. Egypt, Arab Rep. of New Zealand Yugoslavia The Member Body of the following country expressed disapproval of the Recommendation on technical grounds : France* No Member ! Body disapproved the transformation of ISO/R 641 into an International Standard. * Subsequently, this Member Body approved the Recommendation. @ International Organization for Standardization, 1975 . Printed in Switzerland Copyright International Organization for Standardization INTERNATIONAL STANDARD ISO 641-1975 (E) Laboratory glassware - Interchangeable spherical ground joints 0 INTRODUCTION the outer component (or cup member) is not less than the nominal diameter. The purpose of this International Standard is to ensure interchangeability between spherical ground glass joints, irrespective of where they are manufactured. 3 DIMENSIONS The diameter at the wide end of the ground zone shall not external diameter of adjacent tubing, which will ensure be less than the corresponding dimension given in table 1, interchangeability, are given in table 1. The finish of the column 5, and the diameter at the narrow end of the ground surface is also specified, and this is similar to the ground zone shall not be greater than the corresponding finish specified in ISO/R 383, Interchangeable conical dimension given in table 1, column 6. The relationship of ground glass joints. the dimensions is illustrated in figure 1. A conventional designation is adopted, which consists of the code letter "s" in conjunction with the approximate spherical diameter of the joint in millimetres. The bore 4 DIAMETER OF TUBING diameter which may be employed with each size of joint is controlled, for the purposes of this International Standard, The external diameter of tubing adjacent to the joint shal only by the maximum diameter at the narrow end of the not exceed the dimensions given in table 1, column 7. ground zone. NOTE - It is important to limit the external diameter of the tubing A convenient leakage test, to be carried out on ungreased in order to facilitate interchangeability of clamps joints, i