7056 International Standard (SO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEKAYHAPOAHAR OPTAHM3AUMA HO CTAHAAPTW3ALWW ORGANISATION INTERNATIONALE DE NORMALISATION Plastics laboratory ware --- Beakers Materiel de laboratoire en plastique - Béchers First edition --- 1981-09-01 UDC 542.231.5:678.5/.8 Ref.No.1SO7056-1981 (E) 7056-1981 Descriptors : glassware, laboratory glassware, beakers, construction, dimensions, graduations, tests, determination, conductivity, flexibility. No reproduction or networking permitted without license from IHS Not for Resale Price based on 6 pages Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards institutes (Iso member bodies). The work of developing Inter- national 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 7056 was developed by Technical Committee ISO/TC 48, Laboratory glassware and related apparatus, and was circulated to the member bodies in May 1980. Australia Hungary Romania Brazil Italy South Africa, Rep.of Czechoslovakia Korea,Rep.of Spain Egypt, Arab Rep. of Mexico United Kingdom France Netherlands USSR Germany, F. R. Poland The member body of the following country expressed disapproval of the document on technical grounds : India International OrganizationforStandardization,1981 Printed inSwitzerland n for Standardization Not for Resale ISO7056-1981 (E) INTERNATIONALSTANDARD Plastics laboratory ware Beakers 1 Scope and field of application The highest graduation line shall indicate the nominal capacity of the beaker (see clause 5). The lowest graduation line shall This International Standard specifies requirements for a series indicate 20 % of the nominal capacity. Shorter, non-figured, ofsquat-formplasticsbeakersforlaboratoryuse.Itisap- intermediate graduation lines shall indicate intervals of 1, 2 or plicabletobeakershavingataperedoranon-taperedform,The 5 ml, or decimal multiples thereof. non-tapered form may, however, have a slight taper to facilitate mould release during manufacture. The figured graduated lines shall extend at least one-fifteenth of the way round the mean circumference of the beaker, but in any case shall be not less than 8 mm long. 2 Reference The ends of the figured graduation lines shall lie on a ine IEC Publication 335-1, Safety of household and similar elec- coplanar with the axis of the beaker; this line may be marked. trical appliances/Part 1 : General requirements. 4.3 Figuring 3 Sizes The position of thefiguring shall be such as to enable the value The beakers covered by this International Standard have the corresponding to each graduation line to be readily identified. following nominal capacities : The figures indicating the nominal capacity of the beaker shali 25 50 - 100 — 250 = 500 1 000 - 2 000 and be adjacent to the top graduation line, shall be more prominent 5 000 ml. than the other figures, and shall be followed by the inscription "ml". Graduation and figuring 4.4 Tolerances Provided that the beaker is not opaque, it shall be graduated and figured on the outside as follows. Theerrorsingraduationshalinotexceed±10%ofthe indicated values. 4.1 General The graduation lines, figuring and inscriptions shall be clearly 5 Capacity and durably marked. The brimful capacity of a beaker shall be not less than 1,3 times 4.2 Graduation lines the nominal capacity of the beaker for sizes up to 500 ml, and not less than 1,2 times the nominal capacity for larger sizes. Thegraduationlinesshall beof uniformthicknessand shall l