- Dirt content (%wt) < 0.16 max
-Ash content (%wt) < 0.80 max
- Volatile matter content (%wt) < 0.80 max
- Nitrogen content (%wt) < 0.60 max
- Initial Wallace Plasticity (Po) > 30.0 min
- Plasticity Retention Index (PRI) > 40.0 min
- Mooney Viscosity ML (1+4) 100๐ C 80+/-10