Appearance: white or off-white crystalline powder

Melting point: 179℃~183℃

Identification:

1)    Chemical identification: Negative reaction

2)    UV : with the largest absorption at wave-length 225nm and 280nm

3)    IR:  Absorption spectrum conforms with one of Reference substance

Test :

1)    PH: 5.5-7.5

2)    Relative substances:

Toluene, Pyridine: Conforms

Methanol, Dichloromethane:  Conforms

3)    Loss on drying:  0.5% max.

4)    Residue on ignition:  0.1% max.

5)    Heavy metal:  20ppm Max.

Assay ( HPLC ):  98.5% max.

Packing: 25kg /fibre drum