| Appearance | Light yellow crystalline powder |
| Purity | Not less than 99.0% |
| Melting Point | Not less than 134.0℃ |
| Loss on Drying | Not more than 0.5% |
| Light Transmittance(0.5% Toluene Solution) | At 300nm-400nm: Not more than 1% |
| At 450nm-550nm: Not less than 90% | |
| At 500nm: Not less than 95% |