USD $1.00-10.00 / Kilogram
USD $2,000.00-2,000.00 / Metric Ton
USD $1.00-10.00 / Kilogram
specification:(enterprise standard of china)
quality specification |
standard value |
||
analysis pure |
chemical pure |
industrial grade
|
|
operative norm |
white cryst.powder |
white cryst.powder |
white cryst. powder |
(%) ≥ |
99.8 |
99.6 |
99.4 |
moisture content(%) ≤ |
0.5 |
0.5 |
0.5 |
m.p℃ |
132-134 |
131-135 |
130-136 |
residue of ignition (%) ≤ |
0.025 |
0.05 |
0.1 |
insolubility in water |
clarify
|
clarify
|
clarify
|
sulfates (so²¯))(%) ≤ |
0.005 |
0.01 |
0.01 |
chloride (cl)(%) ≤ |
0.001 |
0.002 |
0.002 |
gallic acid |
qualified |
qualified |
|
acetone solution |
light yellow to colorless colorless colorless colorless |
yellow to colorless |
|
ph |
4.0-4.4 |
3.9-4.5 |
|
heavy metal(pt) ≤ |
5.0 |
5.0 |
5.0 |