|
subject |
standard |
|
character |
White or almost white powder with moisture absorption |
|
acidity |
Ph=5.0～7.0 |
|
moisture |
≤5.0% |
|
Heavy metal |
20ppm |
|
Free iodine |
The toluene layer is colorless |
|
Free iodide |
200ppm |
|
Solvent residue |
Methanol ≤0.3%, n-butanol ≤0.3% |
|
Ignition residue |
≤0.1% |
|
About the material |
A≤0.1%，B≤0.5% |
|
content |
97.0～101.0% |
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