久久五月丁香激情综合,成人a大片在线观看,久久精品国产99久久72部,国产精品国产三级国快看本,久久婷婷人人澡人人爽人人爱

Appearance:Light yellow crystalline

Purity:99%min.

Melting point:232.0-234.0

3-Nitrosalicylic acid :0.5% max.

Single impurity  :  0.5% max.

Residue on ignition :0.5% max.

Packing: 25kgs cardboard drum