ITEM	Specification
	Premium grade	First grade
Sodium Borate 10 Hydrous (Na2B4O7·10H2O)%≥	99.5%	95.0%
Sodium carponate (Na2CO3) % ≤	0.1%	0.2%
Insoluble matter in water % ≤	0.04%	0.04%
Sodium Suitate (Na2SO4) % ≤	0.1%	0.2%
Sodium Chloride (NaCl) % ≤	0.03%	0.05%
Iron (Fe) % ≤	0.002%	0.005%