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Excellent-grade | First-grade products | Second-grade products | Qualified products | ||||||||
F-40 | F-40 | F-55 | F-60 | F-40 | F-55 | F-60 | |||||
HF% Min | 40.0 | 40.0 | 55.0 | 60.0 | 40.0 | 55.0 | 60.0 | ||||
H 2 SiF 6 % Max | 0.02 | 0.2 | 0.4 | 0.5 | 0.6 | 1.0 | 1.0 | ||||
H 2 SO 4 % Max | 0.02 | 0.05 | 0.08 | 0.1 | 0.6 | 0.8 | 1.0 | ||||
Fe% Max | 0.005 | 0.01 | - | - | - | - | - |