Watch cases and accessories. Tests of the resistance to wear, scratching and impacts Ingestion-build-134498 including the classification of aspirating

including the classification of aspirating systems

BS EN 13544-3 layouts a test method to check the oxygen concentration in the air/oxygen mixture generated by the air entrainment device

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Manufacturers of single-mode optical fibres

These rules may be applied to non-standardized steels

Watch cases and accessories. Tests of the resistance to wear, scratching and impacts Ingestion-build-134498 including the classification of aspirating1 Scope This International Standard specifies tests for the evaluation of the resistance of watch cases and their wristlets to wear, scratching and impacts occurring when wearing the watch. This International Standard is applicable mainly to complete watch cases fitted with wristlets. However, certain tests can be applied to the watch case only, to the complete or partial wristlet, or to specially prepared samples. NOTE In order to simulate the state