ITEM
|
TOP GRADE
|
FIRST GRADE
|
Appearance
|
Grayish-white or light yellow powder
|
|
Purity, %≥
|
98
|
96
|
Melting point, ℃≥
|
173.0
|
171.0
|
Heating loss, %≤
|
0.30
|
0.40
|
Ash content, %≤
|
0.30
|
0.30
|
Residue(150μm), % ≤
|
0.00
|
0.10
|