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
|