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% |