5979 International Standard (ISO INTE RNATIONAL ORGANIZATION FOR STANDARDIZATION·MEKAYHAPOAHAA OPrAHW3ALMA HO CTAHAAPTW3ALWWGORGANISATION INTE RNATIONALE DE NORMALISATION Rubber or plastics coated fabrics Determination of flexibility -- Flat loop method Supports textiles revetus de caoutchouc ou de plastique -- Determination de la souplesse - Methode de la boucle plate First edition - 1982-11-15 UDC 678.066 : 620.1 : 539.557 ISO 5979-1982 (E) Ref. No. ISO 5979-1982 (E) Descriptors : coated fabrics, fabrics coated with plastics, fabrics coated with rubber, tests, determination, flexibility. Price based on 3 pages Not for Resale Foreword iso (the Internationai 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-governmentai, in liaison with iso, also take part in the work. Draft International Standards adopted by the technicai committees are circulated to the member bodies for approval before their acceptance as International Standards by the isO Council. International Standard iSO 5979 was developed by Technical Committee ISO/TC 45, Rubber and rubber products, and was circulated to the member bodies in January 1981. It has been approved by the member bodies of the following countries : Australia India Romania Austria Italy South Africa, Rep. of Belgium Korea, Dem. P. Rep. of Spain Brazil Korea, Rep. of Sri Lanka Canada Mexico Sweden China Thailand Netherlands Philippines Czechoslovakia United Kingdom Poland USA Denmark Portuga! USSR France The member body of the following country expressed disapproval of the document on technical grounds : Germany, F. R. International Organization for Standardization, 1982 Printed in Switzerland d without license from IHS Not for Resale ISO 5979-1982 (E) INTERNATIONAL STANDARD Rubber or plastics coated fabrics - Determination of flexibility - Flat loop method 4.2 Steel bar, of stainless or non-corrosive steel, having a Scope and field of application length of 200 mm and a square section of 20 mm side. 1.1 This International Standard specifies a method of 4.3 Rule, graduated in millimetres. characterizing the flexibility of some rubber or plastics coated fabrics. 5 Test pieces 1.2 The method is not applicable to coated fabrics which are prone to rolling up or spiralling when they are cut into pieces of 5.1 Shape and dimensions small dimensions, nor is it applicable when the coated fabric is too rigid to make a loop. The test piece shall have the shape of a rectangle, 600 mm long and 100 mm wide. 1.3 The method may be carried out on : 5.2 Number a) the coated fabric as delivered; Use three test pieces cut in the longitudinal direction and three a coated fabric which has undergone certain specified test pieces cut in the transverse direction. treatments. 5.3 Sampling 2 Reference The test pieces shall be taken so that their outside edges are at ISO 2231, Fabric coated with rubber or plastics - Standard at- a minimum distance of 100 mm from the edges of the coated mospheres for conditioning and testing. part. They shall not be taken at a distance less than 1 000 mm from the ends of the coated part or at a location having a fold or an apparent defect. 3 Principle Time interval between manufacturing and Formation of a loop from a rectangular strip of coated fabric, 6 placed on a horizontal plane, by superposing the two ends testing which are then held together under a steel bar. Measurement of the height of the loop. 6.1 For all purposes, the minimum time between manufac- turing and testing shall be 16 h. The flexibility is characterized by the height of the loop; this is an inverse measure and the lower the loop height the greater 6.2 For non-product tes