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| Index name |
Top-grade
|
First grade
|
Qualified product
|
| Appearance(eye) |
Off-white or light yellow powder
|
||
| Initial Melting point, ℃≥ |
99.0
|
98.0
|
96.0
|
| Loss on heat, % ≤ |
0.20
|
0.30
|
0.50
|
| Ash, % ≤ |
0.20
|
0.30
|
0.40
|
| Residue on screen(149um), % ≤ |
0.00
|
0.05
|
0.10
|