BS ISO 20940:2021 pdf download – Leather — Crust full chrome upper leather — Specifications and test methods This document specifies requirements, methods of testing and methods of sampling for crust full chrome upper leather to be used in all types of footwear (see Table 1). 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 2418, Leather — Chemical, physical and mechanical and fastness tests — Sampling location ISO 2588, Leather — Sampling — Number of items for a gross sample ISO 3376, Leather — Physical and mechanical tests — Determination of tensile strength and percentage elongation ISO 3377-2, Leather — Physical and mechanical tests — Determination of tear load — Part 2: Double edge tear ISO 3379, Leather — Determination of distension and strength of surface (Ball burst method) ISO 4045, Leather — Chemical tests — Determination of pH and difference figure ISO 4048, Leather — Chemical tests — Determination of matter soluble in dichloromethane and free fatty acid content ISO 5398-1, Leather — Chemical determination of chromic oxide content — Part 1: Quantification by titration ISO 5402-1, Leather — Determination of flex resistance — Part 1: Flexometer method ISO 11640, Leather — Tests for colour fastness — Colour fastness to cycles of to-and-fro rubbing ISO 14268, Leather — Physical and mechanical tests — Determination of water vapour permeability ISO 17070, Leather — Chemical tests — Determination of tetrachlorophenol-, trichlorophenol-, dichlorophenol-, monochlorophenol-isomers and pentachlorophenol content ISO 17075-1, Leather — Chemical determination of chromium(VI) content in leather — Part 1: Colorimetric method ISO 17075-2, Leather — Chemical determination of chromium(VI) content in leather — Part 2: Chromatographic method ISO 17226-1, Leather — Chemical determination of formaldehyde content — Part 1: Method using high- performance liquid chromatography ISO 17229, Leather — Physical and mechanical tests — Determination of water vapour absorption ISO 17234-1, Leather — Chemical tests for the determination of certain azo colourants in dyed leathers — Part 1: Determination of certain aromatic amines derived from azo colourants 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses:...
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