ITEM
|
TOP GRADE
|
FIRST GRADE
|
Appearance
|
Milky white or light yellowish brown powder
|
|
Purity, %≥
|
98
|
96
|
Melting point, ℃≥
|
106.0
|
104.0
|
Heating loss, % ≤
|
0.30
|
0.40
|
Ash content, % ≤
|
0.30
|
0.40
|
Residue(150μm), % ≤
|
0.10
|
0.10
|
Insoluble in methanol, % ≤
|
1.0
|
1.50
|