| CHARACTERISTICS | ( Europeans En 159 B 333 ) | ORINDA VALUE |
| Deviation in Length | ± 0.5% | ± 0.2% |
| Deviation in Thickness | ± 0.5% | ± 0.3% |
| Deviation in Squareness | ± 0.6% | ± 0.2% |
| Deviation in Wedging | ± 0.5% | ± 0.2% |
| Deviation in Flatness | ± 0.5% | ± 0.3% |
| Water Absorbtion | > 10% | 14-16% |
| Resistance to scratch on MOH's scale | min 3 | min 3 |
| Resitance to Abrasion | PEA Group || | |
| Chemical Resistance | Resistance to all acids alkaline except hydrofluoric acid |
Resistance to all acids alkaline except hydrofluric acid |
| Bending strength | > 150 Kg / cm 2 | > 180 to 200 Kg / cm 2 |
| Crasing | 1 - Cycle | No Crasing at 3 - Cycle |