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DE?? ??
?? 14??? ?? ??? ??? ??? ??.
?? ???? ?? ??? ??? ??? ??? ????: ??? ??, ????, ?? ??.
German Institute for Standardization, ?? ??
- DIN 50451-6 E:2012-11 ??? ??? ?? ??? - ?? ? ?? ?? ?? - 6?: ??? ????? ??(NH4F) ? ??? ????? ??? ?? ????? 36? ?? ??
- DIN 50451-6:2014 ??? ??? ???? ?? ??? ?? ? ?? ?? ?? 6?: ??? ??? ??? ????? ?? ?? ??? ? ??? ????? ??(NH4F)?? 36? ?? ??
Professional Standard - Chemical Industry, ?? ??
Group Standards of the People's Republic of China, ?? ??
Japanese Industrial Standards Committee (JISC), ?? ??
Korean Agency for Technology and Standards (KATS), ?? ??