Leather. Chemical determination of the preservative (TCMTB, PCMC, OPP, OIT) content in leather by liquid chromatography - Acetonitrile extraction method1 Scope This document specifies a test method by acetonitrile solvent extraction for the determination of the total content (solvent extractible) of the following preservative agents in leather by liquid chromatography: 2 (thiocyanomethylthio) benzothiazole (TCMTB); 4 chloro 3 methylphenol (PCMC); 2 phenylphenol (OPP); 2 octylisothiazol 3(2H) one (OIT); This method can also be used to determine breakdown products of these preservative agents, which

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This International Standard describes the stress optical method for determining the birefringence in glass

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