Introduction of national standards
AATCC 20-2018 pdf free.Fiber Analysis: Qualitative. Sulfuric acid solution. 59.5 ± 0.25% by weight, density 1.4929 * 0.0027 g per ml at 20°C. Weigh into a bcakcr 59.5 g of conccntrated sulfuric acid (sp gr l.X4). Weigh into a 250 ml Erlcnmcycr flask 40.5 g of distilled water Cautiously add the acid to the waler swirling and cooling in ice […]
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AATCC 20A-2018 pdf free.Fiber Analysis. 13.1 The following procedure may be used for the quantitative analysis of textiles containing two or more fiber types which cannot be separated readily by mechanical or chemical methods. The procedures rely on the ability of a technician to identify and count, by means of a microscope, the relative number of fibers of each type […]
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