Item	Excellent	Grade 1	Grade 2
Appearance	White	White or yellowish	Primrose
Melting Point °C ≥	132	132	131
Content %<G.C> ≥	99.5	99	98
Loss on Drying %≤	1	1	1
Ignition Residue %≤(on sulfate base)	0.1	0.1	0.1
Sensitivity to Zinc	Up to Stanard	Up to Stanard	Up to Stanard