|
subject |
standard |
|
character |
White or yellowish powder with moisture absorption |
|
acidity |
5.2～6.5 |
|
moisture |
≤1.5% |
|
Heavy metal |
20ppm |
|
Free aromatic amine |
0.1% |
|
Free iodine |
The toluene layer is colorless |
|
Free iodide |
20ppm |
|
Solvent residue |
Ethanol 0.4% or less |
|
Ignition residue |
≤0.1% |
|
About the material |
≤3.0% |
|
N-acetylates |
≤1.5% |
|
Isomer ratio |
E1+Z1=40.0～51.0%, E2+Z2=49.0～60.0% |
