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% |