| 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 | 
 
 
 
 
 
 
 
 
 
