Appearance : White or light yellow crystalline powder Assay :99.0% min. Heavy metals :5ppm max. Colour (Gardner-10% aqueous solution) :1.0 max. Loss on drying a.5.0% max b. 3.0% max PH value :1.2-2.2 UV Absorbance Max @285nm 460 min. UV Absorbance Max @325nm 290 min. Melting Point (ípC) :140 min. Turbidity in water (EBC) :1.5 max 500KG per lot no.