ISO INTERNATIONAL STANDARD 4643 Second edition 1992-02-01 Moulded plastics footwear -- Lined or unlined poly(vinyl chloride) boots for general industrial Specification use - Articles chaussants moules en plastique - Bottes industrielles doublees Specifications Reference number ISO 4643:1992(E) Not for Resale ISO 4643:1992(E) Foreword iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing International Standards is normally carried out through iso technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with IsO, also take part in the work. Iso collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- bodies casting a vote International Standard IsO 4643 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products. edition This second . cancels and replaces the first edition (Is0 4643:1980), from which it differs in the following respects: a) there is a minimum requirement for the intercleat thickness: fied in more detail; c) the requirements for the preparation of test pieces are more clearly specified; d) the hardness test is required to be carried out not less than 7 days after manufacture, but the upper limit of 90 days has been deleted; e) the thickness of the foxing at the back of the heel is 4,0 mm com- pared with 3,5 mm; the requirements for the breaking force of the coated fabric upper f) material are deleted, because wear performance is more accurately predicted by the boot upper flexing test; ISO1992 C permlssion in writing from the publisher. international Organization for Standardization Printed in Switzerland 11 CopyrightInternationalOrganizationfor Standardization Not for Resale ISO 4643:1992(E) g) tensile properties are measured at 23 °C and the maximum value for the modulus at 100 % elongation has been increased to 4,6 MPa for the upper and 5,o MPa for the soling to aliow for both single and double injection processes; the minimum values for the modulus at 100 % elongation are unchanged; h) the minimum value for the elongation at break of the upper material has been reduced to 250 %, to take into account the effect of in- creased polymer orientation in a moulder upper compared to that in a sole; the hardness range of the polyvinyl chloride compound has been changed for both the upper and soling compound, to allow for both single and double injection processes: j) there is the addition of reference to the dimensions of three-quarter and full thigh boots; k) a minimum radius has been specified for the corners at the base of the sole pattern; I) marking of footwear now includes the identity of the country of origin. distributor or retailer; m) the maximum cold flex temperature has been reduced from - 25 °c to - 35 °C; n) the volatility limit has been raised from 1,6 % to 2,0 % Annexes A, B and C forim an integral part of this International Standard. Annex Dis forinformation only ii CopyrightInternationalOrganizationfor Standardization hout license from IHS Not for Resale