| ITEM | STANDARD VALUE |
| Bloom g | 60-260 |
| Viscosity (6.67%;Mpa.S) | 2.5-9 |
| Transparency | ≥300 |
| Material | Bovine Leather |
| PH | 4.0-7.2 |
| Moisture | ≤12% |
| Ashes | ≤2.5% |
| Smell | None |
| Exterior | Light yellow or brown irregular particles |
| Conclusion | Product conforms to QB/T 1995-2005 |
| Shelf life | Within two years from the production date |
| Storage | Store in original packaging in a dry place, in a green house |