4.80 NTERNATIONAL STANDARD 1772 tso INteRNaTiOnaL ORGANIZATioON FOR StaNDARDIZATiOn MEIyHAPOha OPrAHW3AuMS HO CTaHIaPTH3AWW.ORGANiSATIOn iNTeRNaTIONaLE DE NoRmALisaTION Laboratory crucibles in porcelain and silica Creusets de laboratoire en porcelaine et en silice First edition - 1975-09-01 ANsr Internat Doc Sect .AU8 2 6.1975 Betl ISO 1772-1975 (E) UDC 542.232.5.004.1 Ref. No. 1SO 1772-1975 (E) Descriptors : laboratory glassware, crucibles, porcelain, silicon dioxide, specifications, designation. Price based on 4 pages Copyright International Organization for Standardization 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 StandardsbytheISOCouncil. as Iso Recommendations; these documents are now in the process of being transformed into International Standards. As part of this process, Technicai Committee ISO/TC 48 has reviewed 1SO Recommendation R 1772 and found it technically suitable for transformation. International Standard isO 1772 therefore repiaces IS0 Recommendation R 1772-1970 to which it is technically identical. ISO Recommendation R 1772 was approved by the Member Bodies of the following countries : Austria India South Africa, Rep. of Belgium Iran Spain Canada Ireland Thailand Turkey Colombia Italy Czechoslovakia Korea, Dem. P. Rep. of United Kingdom Egypt, Arab Rep. of Netherlands U.S.A. France New Zealand U.S.S.R. Germany Peru Yugoslavia Poland Greece No Member Body expressed disapproval of the Recommendation. No Member Body disapproved the transformation of ISO/R 1772 into an International Standard. Internationat Organization for Standardization, 1975 : Printed in Switzerland Copyright International Organization for Standardization e from IHS Not for Resale ISO 1772-1975 (E) INTERNATIONAL STANDARD Laboratory crucibles in porcelain and silica 1 SCOPE AND FIELD OF APPLICATION 5 SERIESOF SIZES The series of sizes of crucibles shall be as shown in the This International Standard specifies requirements for an acceptable series of porcelain and silica internationally table. crucibles and lids for general laboratory requirements. NOTE - No values of nominal capacity are specified, but it is that manufacturers should state these for the NOTES recommended information of users, on the basis that : It is recognized that some sizes of crucible larger than those nominal capacity = approximately 75 % of overflow capacity. is recommended that such larger sizes should be designed within the general framework of this International Standard, i.e. by selecting a suitable muitiple of 10 mm as the nominal externaf top diameter, 6 MATERIAL and applying one of the three standard ratios in order to obtain the 6.1 Porcelain crucibles and lids shall be made from nominal height. vitrified porcelain with a glazed surface, but the bases and 2 This International Standard does not deal with laboratory rims of the crucibles need not necessarily be glazed. The crucibles s made of materials other than porcelain and silica (for example, glass and other ceramic materials, metals, plastics porcelain used shall satisfy the requirements of ISO 1775. dimensions specified herein may provide useful guidance for those NOTE- The sizes and dimensions included in this International concerned with the manufacture or standardization of crucibles Standard may also conveniently be applied to crucibles of unglazed made of such other materials, and th