A borosilicate crown glass that is relatively hard, does not scratch easily, and performs well in chemical tests. It also has excellent transmittance, as low as 350 nm.
Properties:
| Index of Refraction (@587.6nm) | 1.51680 |
| Abbe Factor (vd) | 64.20 |
| Density (gm/cm3) | 2.52g/cm3 |
| -30° to +70° (per °C) | 7.1 × 10-6 |
| +20° to +300° (per °C) | 8.3 × 10-6 |
| Transformation Temperature (°C) | 557 |
| Young Modulus (dynes/mm2) | 8.20 × 109 |
| Climate Resistance | 2 |
| Stain Resistance | 0 |
| Acid Resistance | 1.0 |
| Alkali Resistance | 2.0 |
| Phosphate Resistance | 2.3 |
| Knoop Hardness | 610 |
| Poisson’s Ratio | 0.206 |
| Dimension （mm） | 1000mm |