sh Q3'S NTERNATIONAL STANDARD TSO 1775 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION-MEIYHAPOIHAR OPIAHM3AMR HIO CTAHIAPTM3ALIMM.ORGANISATION INTERNATIONALE DE NORMALISATION Porcelain laboratory apparatus - Requirements and methods of test Appareilsdelaboratoireenporcelaine-Specificationsetmethodesd'essai First edition-1975-09-01 ANSi Intemat Doc Sect AUG261975 O1775-1975(E) UDC542.232:620.16 Ref.No.ISO 1775-1975 (E) Descriptors:laboratory glassware,porcelain,tests,thermal tests,high temperaturetests,alkali resistance tests,acid resistance tests 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. 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/TC48 has reviewed 1SORecommendation R1775 and found it technically suitable for transformation.International Standard ISO1775 therefore replaces ISO Recommendation R 1775-1970 to which it is technically identical. ISO Recommendation R1775 was approved by the Member Bodies of the following countries : Austria India South Africa, Rep. of Belgium Iran Spain Canada Ireland Thailand Colombia Israel Turkey Czechoslovakia Italy United Kingdom Egypt, Arab Rep. of Netherlands U.S.A. France NewZealand U.S.S.R. Germany Peru Yugoslavia Greece Poland No Member Body expressed disapproval of the Recommendation. No Member Body disapproved the transformation of ISO/R1775 into an InternationalStandard. ?International.OrganizationforStandardization,1975 Printed in Switzerland ISO 1775-1975 (E) INTERNATIONALSTANDARD Porcelain laboratory apparatus - Requirements and methods of test 1SCOPEANDFIELDOFAPPLICATION the porcelain shall not break, crack or show crazing as defined in B.4. This International Standard specifies requirements for a quality of porcelain suitable for all types of porcelain laboratory apparatus (inciuding microchemical apparatus) and describes appropriate methods of test. 6 RESISTANCEOFGLAZETOHIGHTEMPERATURE NOTE - Some of the tests specified should, for convenience, be When tested by the method described in annex C, the glaze carried out only on the articles mentioned, the results being of the porcelain shall not show softening as defined in C.3. accepted as generally applicable to all articles manufactured under similar conditions from the same batch of material. 7 CONSTANCYOFMASSONIGNITION 2SAMPLING The whole articles or pieces of porcelain apparatus selected Whentestedbythe methoddescribed in annexD,the for the tests shall be representative of the batch or porcelain shall not vary in mass by more than O,1 mg per 10 g of total mass. consignment as a whole.The selection should preferablybe made by application of a standard sampling procedure, agreed between the parties to the tests. 8 RESISTANCEOFGLAZETOACIDORALKALI 3POROSITY When tested by the method described in annex E, the When tested by the method described in annex A, the porcelain shall not show losses in mass greater than the fol- porcelain shail not show staining as defined in A.4.1. lowing amounts : a) Hydrochloric acid test 4 GLAZE O,01mg per square centimetre of the total inner When tested by the method described in annex A, the glaze surface of the vessel. of the porcelain shall not show crazing or other defects as b)Sodiumcarbonatetest defined in A.4.2. O,1 mg per square centimetre o