1923 International Standard (ISO INTERNATIONALORGANIZATIONFORSTANDARDIZATION MEKAYHAPOAHAROPFAHM3AUMR OCTAHAAPTM3AUMMORGANISATIONINTERNATIONALEDENORMALISATION Cellular plastics and rubbers -- Determination of linear dimensions Plastiques et caoutchoucs alveolaires-Determination des dimensions lineaires Second edition-1981-09-01 1923-1981 (E) UDC 678-496.8 : 531.71 Ref. No. ISO 1923-1981 (E) Descriptors : cellufar materials, dimensional measurement, Foreword Iso (the International Organization for Standardization) is a worildwide federation of national standards institutes (lso 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 theIsoCouncil. International Standard ISO 1923 was developed jointly by Technical Committees ISo/TC 45,Rubberandrubber products,and ISO/TC 61,Plastics,andwas circulated to the member bodies in May 1976. It has been approved by the member bodies of the following countries : Australia India Poland Austria Iran Portugaf Belgium Israel Romania Brazil Italy Spain Canada Japan Sweden Czechoslovakia Korea, Rep. of Switzerland Finland Mexico Turkey France Netherlands United Kingdom Germany, F.R. New Zealand USA Hungary Philippines USSR No member body expressed disapproval of the document. This second edition cancels and replaces the first edition (i.e. ISo 1923-1972), as well asISo Recommendation R1794-1967,of which it constitutes a technical revision. @ International Organization for Standardization, 1981 Printed in Switzerland ISO1923-1981 (E) INTERNATIONALSTANDARD Cellular plastics and rubbers - Determination of linear dimensions Scope and field of application 3.4 Metal rule or metal tape, graduated in millimetres and permitting reading to an accuracy of 0,5 mm. This International Standard specifies the characteristics and.the choice of the measuring equipment and procedure for deter- mination of the linear dimensions of sheets, blocks or test specimens of cellular material (flexible and rigid). 4 Procedure 2 Definition 4.1 Choice of measuring equipment For the purposes of this International Standard the following The choice of measuring equipment shall be in accordance with definition applies : the accuracy corresponding to the dimensions to be measured (see the table) : linear dimension : The shortest distance, measured with an instrumentaccordingtoclause3,betweentwospecificpoints, a) When an instrument accuracy of 0,05 mm is required, a between two parallel lines or between two parallel planes, dial gauge (3.1) or micrometer (3.2) shall be used. The defined by corners, edges or surfaces of the cellular specimen. micrometer may be used only for specimens of rigid cellular material with a shape not permitting the use of a dial gauge. 3Measuring equipment An accuracy of 0,05 mm shall not normally be required for dimensions of more than 10 mm. 3.1 Dial gauge with a measuring surface of about 10 cm2. b) When an instrument accuracy of 0,1 mm is required, a The gauging pressure shall be 100 ± 10 Pa1l and the reading sliding caliper (3.3) shall be used. accuracy shalil be 0,05 mm. This accuracy of o,1 mm shall not normally be required for 3.2 Micrometer, having a measuring surface with a dimensions of more than 100 mm. minimum diameter of 5 mm, but in any case not less than five times the average diameter of the cells,permitting reading with NOTE - in this case, a diai gauge or micrometer (rigid celluiar material only) may also be used, but then the instrument accuracy anaccuracyofo,05mm. need not be better than that of a sliding caliper