BS ISO 6915:2019 pdf download – Flexible cellular polymeric materials — Polyurethane foam for laminate use — Specification This document specifies the minimum requirements for flexible polyurethane foams up to and including 20 mm thick intended for combination with suitable substrates such as non-woven, woven or knitted fabrics, to form a laminate. Three types of flexible polyurethane foam are specified as follows: — type 1: polyether; — type 2: polyester with minimum elongation at break of 200 %; — type 3: polyester with minimum elongation at break of 300 %. 2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 845, Cellular plastics and rubbers — Determination of apparent density ISO 1798, Flexible cellular polymeric materials — Determination of tensile strength and elongation at break ISO 1923:1981, Cellular plastics and rubbers — Determination of linear dimensions ISO 2440, Flexible and rigid cellular polymeric materials — Accelerated ageing tests 3 Terms and definitions No terms and definitions are listed in this document. ISO and IEC maintain terminological databases for use in standardization at the following addresses: — ISO Online browsing platform: available at https://www.iso.org/obp — IEC Electropedia: available at http://www.electropedia.org/ 4 Appearance 4.1 The material shall consist of a uniform network of cells and shall be free from any flaws, stains and other defects which might detrimentally affect the serviceability. 4.2 Material of thickness up to and including 6 mm shall lie flat when laid on a flat surface. 4.3 The material shall have no holes more than 3 mm in diameter through the full thickness of the foam. The maximum number of holes of diameter between 1,5 mm and 3 mm in any 60 m2 of material shall be not more than four for material of thickness 2 mm or less, and not more than eight for thicker material. 8 Apparent density The apparent density of the material, when determined by the method given in ISO 845, shall be within ± 10 % of the nominal value agreed between the purchaser and the supplier. 9 Cell count The cell count shall be as agreed between the purchaser and the supplier subject to a tolerance of ± 10 %. It...
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