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Limestone precipitation light calcium carbonate index | |||||||||||||||
Precipitated light calcium carbonate Index Item | HG/T 2226-2010 | ||||||||||||||
Rubber and plastics | Coatings | Papermaking | |||||||||||||
Top grade | First grade | Top grade | First grade | Top grade | First grade | ||||||||||
Calcium carbonate (CaCO 3 ) % ≥ | 98 | 97 | 98 | 97 | 98 | 97 | |||||||||
PH value | 9-10 | 9-10.5 | 9-10 | 9-10.5 | 9-10 | 9-10.5 | |||||||||
Volatile at 105 °C% ≤ | 0.4 | 0.5 | 0.4 | 0.6 | 1.0 | ||||||||||
Insolubles in hydrochloric acid% ≤ | 0.1 | 0.2 | 0.1 | 0.2 | 0.1 | 0.2 | |||||||||
Sediment Volume ml/g ≥ | 2.8 | 2.4 | 2.8 | 2.6 | 2.8 | 2.6 | |||||||||
Iron (Fe)% ≤ | 0.05 | 0.08 | 0.05 | 0.08 | 0.05 | 0.08 | |||||||||
Manganese (Mn)% ≤ | 0.005 | 0.008 | 0.006 | 0.008 | 0.006 | 0.008 | |||||||||
Sieve residue | 125μm test sieve % ≤ | Passed | 0.005 | Passed | 0.005 | Passed | 0.005 | ||||||||
45μm test sieve % ≤ | 0.2 | 0.4 | 0.2 | 0.4 | 0.2 | 0.4 | |||||||||
Whiteness ≥ | 94 | 92 | 95 | 93 | 94 | 92 | |||||||||
Oil absorption (g/100)≤ | 80 | 100 | -- | -- | -- | -- | |||||||||
Black point ≤ | 5 | ||||||||||||||












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