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