Industrial precipitated calcium carbonate

Our company's industrial precipitated calcium carbonate(light calcium carbonate) is produced according to HG/T2226-2000 standard. The specifications are as the following:

Item	Index
	National industrial standard	Enterprise standard
Calcium carbonate(CaCO3) (based on dry basis) % ≥	97.0	98.0
PH value(10% suspension)	9.0-10.5	9.0-10.0
Volatile matter below 105°C% ≤	0.70	0.20
Insoluble substance in hydrochloric acid % ≤	0.20	0.20
Settling volume ml/g ≥	2.6	2.6-3.0
Iron(Fe) % ≤	0.10	0.10
Manganese(Mn) % ≤	0.008	0.008
Residue on sieve: 125µm test sieve% ≤ 45µm test sieve% ≤	0.010 0.40	0.010 0.15
Whiteness.drgess ≥	90.0	94.0
Water-soluble substance % ≤		0.2