Molecular formula:  KHC₄H₄O₆

Molecular Weight:  188.17

Appearance:  White or yellowish crystalline powder.

Assay:  99.5%min

Sulfate (SO₄^2-):  0.02% max

Readily oxidizable substance:  Qualified

Heavy metal( as Pb)：  0.002% max

As (as As₂O₃):  0.0004% max

Loss on drying:  0.5% max

Application :  Used as food additive. 

Packing:  25kg/kraft bag