Physical and mechanical properties of products
| Item | Unit | Control index | test index | Test method | |
| Exterior | - | no different color | no different color | Visual inspection | |
| Intrinsic viscosity | dl/g | 0.685±0.015 | 0.678 | GB/T1793 2-2013 |
|
| Carboxyl content | mol/t | 16±4 | 15.41 | ||
| Color value (drying) | L | - | ≥75 | 77.75 | |
| b | - | 6±2 | 7.8 | ||
| Alien particles | wt% | ≤0.4 | 0 | ||
| 100-grain weight | g/100 | 3±1.5 | 2.62 | ||
| Water conent | wt% | ≤0.4 | 0.05 | ||
| Titanium Dioxide(TiO2) | wt% | 0.28±0.03 | 0.31 | ||
| Phosphorus content | (mg/kg) | ≥6500 | 6,980 | ||
| Diethylene glycol content | wt% | 1.3±0.30 | 1.39 | ||
| Melting point | ℃ | 260±2 | 260.2 | ||