Item

Grades

chemicals，%

min

impurity，max

F

Al

Na

SiO₂

Fe₂O₃

SO₄²

P₂O₅

H₂O 550℃ for 1 hour

Special 1

61

30.0

0.5

0.28

0.10

0.5

0.04

0.5

Special 2

60

30.0

0.5

0.30

0.13

0.8

0.04

1.0

Grade 1

58

28.2

3.0

0.30

0.13

1.1

0.04

6.0

Grade 2

57

28.0

3.5

0.35

0.15

1.2

0.04

7.0