--White exiguous acicular or oblique-pillar crystal. Smell-less,tast-bitter.Easily efflorescent at dry air.

--Speciific gravity is 1.68.

--Freely soluble in water . Soluble in its own water at 67.5oC.Slightly soluble in ethanol and glycerin.

--Dcomposing is heatedup.Lossing 4 crystal water at 70-80oC.About at 200oC,lossing all of its crystal water becomes anhydrous compounds.



Use:

--Mainly used in fertilizer, tanning, pringting and dyeing,activator,paper-making,plastic,porcelain,pigment ...