Superior
product
|
First
grade
|
Qualified
product
|
|
Thiourea%
≥
|
99.00
|
98.50
|
98.00
|
Heating loss
% ≤
|
0.40
|
0.50
|
1.00
|
Ash %
≤
|
0.10
|
0.15
|
0.30
|
Water
insoluble substance % ≤
|
0.20
|
0.05
|
0.10
|
Thiocyanate%
≤
|
0.02
|
0.05
|
0.10
|
Melting
point℃
|
171
|
170
|
|