Thanks. The part that was confusing was I could not find it in the Niosh pocket guide. Chemistry was not my strong point. It looks to me like the concentration being handled affects the precautions. I am getting the mask and also will be using disposable coveralls, full face shield when pouring 12%, safety glasses the rest of the time when diluted. Any other safe practices recommended? As I research some of the effects such as tissue necrosis is pretty interesting. Thanks for the responce
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