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Index item | Top-Grade | First-Grade | Second-Grade | Qualified |
Wollastonite Content % ≥ | 90 | 90 | 70 | 60 |
SiO2 Content% | 48-52 | 48-52 | 4-59 | 41-59 |
CaO Content % ≥ | 45-48 | 45-48 | 40-50 | 38-50 |
Fe2O3 Content % ≤ | 0.2 | 0.2 | 0.8 | 1.5 |
Loss of ignition% ≤ | 2.5 | 2.5 | 6.0 | 9.0 |
Whiteness% ≥ | 90 | 90 | 75 | — |


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