3386/1 OS International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXAYHAPOAHAA OPFAHM3AUMA HO CTAHAAPTW3AMW+ORGANISATION INTERNATIONALE DE NORMALISATION Polymeric materials, cellular flexible - Determination of stress-strain characteristic in compression Part 1 : Low-density materials Materiaux polymeres alveolaires souples - Determination de la caracteristique de contrainte-deformation relative en compression - Partie 1 : Materiaux a basse masse volumique Second edition -- 1986-06-01 (3) Ref. No. ISO 3386/1-1986 (E) UDC 678-405.8 : 620.173 3386/1-1986 ( Descriptors : rubber, plastics, polymers, flexible cellular materials, tests, compression tests. OS Price based on 3 pages yright International Organization for Standardization Not for Resale 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. 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. They are approved in accordance with ISO procedures requiring at International Standard ISO 3386/1 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products. This second edition cancels and replaces the first edition (IS0 3386/1-1979), of which it constitutes a minor revision. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. @ International Organization for Standardization, 1986 : Printed in Switzerland ted without license from IHS Not for Resale ISO 3386/1-1986 (E) INTERNATIONAL STANDARD Polymeric materials, cellular flexible -- Determination of stress-strain characteristic in compression Part 1 : Low-density materials 3 Definitions 1 Scope and fieid of application This part of ISo 3386 specifies a method for the determination For the purposes of this International Standard the following of the compression stress/strain characteristic of low-density definitions apply. flexible cellular materials up to 250 kg/m3. It also indicates a method for the calculation of the compression stress value of 3.1 compression stress/strain characteristic (CC): The such materials. stress, expressed in kilopascals*, required to produce a com- pression, at a constant rate of deformation during the fourth The compression stress/strain characteristic is a measure of the ioading cycle of the test specified below, expressed as a func- load-bearing properties of the material, though not necessarily tion of the compression. of its capacity to sustain a long-term load. 3.2 compression stress value (CVao): The compression The compression stress/strain characteristic differs from the stress/strain characteristic for a compression of 40 %. indentation hardness characteristics (as determined in accord ance with Iso 2439), which are known to be influenced by the thickness and the tensile properties of the flexible cellular material under test, by the shape of the compression plate and Apparatus by the shape and size of the test piece. 4.1 Test machine ISO 3386/2 specifies a method for high-density materials and differs from part 1 in the following ways : The test machine shall be capable of compressing the test piece between a support surface (see 4.2) and a compression plate - it is mainly concerned with materials of density above (see 4.3), which shall have a uniform relative rate of motion in 250 kg/m3; the vertical direction of 100 ± 20 mm/min. - c