National standards for safety footwear
China's safety shoes standards, the current is GB21148-2007, China safety shoes standards, basic reference to European standards to develop.GB4014-83 leather safety shoes; GB7054-86 rubber surface crash safety boots. Applicable to electroplating workers, pickling workers, electrolytic workers, distributors, Chemical operators, etc.. Note: acid shoes can only be applied to the general low concentration acid workplace; avoid contact with hot, sharp injury upper or sole leakage; wear shoes on the washing liquid pH, the application of water after use and dry, avoid direct sunlight or drying.
1, change of hardness (IRHD) of sulfuric acid, hydrochloric acid, sodium hydroxide H= + 10. (the test results are +6, +4, +3, meet the standard)2, quality change (%) of sulfuric acid, hydrochloric acid, sodium hydroxide m= + 2 (in accordance with the standard test results for +0.6, +0.5, +0.6).3, tensile properties (%), sulfuric acid, hydrochloric acid and sodium hydroxide tensile strength change decreased by less than 15 (test results are -8, -6, -4, conform to standard).4, elongation at break (%), sulfuric acid, hydrochloric acid and sodium hydroxide change no more than + 20 (test result is -8, -5, -4, conform to standard).
