... °C.Application Used as fire-preventing agent for fabric ,timber,and paper; as water softener for boilers, as food additive,buffer agent ... to acidty,as glaze,solder,baking powder,tanning ... %≤0.10.15Sulfate,as SO4 %≤0.056Chloride, as Cl %≤0.0147Frioride,as F %≤0.0058Heavy metal,as pb %≤0.0019Arsenic,as As %≤0.0003 dsp ...