Zero Expansion Glass
Lw1 is a zero expansion glass ceramic characterized by excellent homogeneity, excellent chemical stability, and an extremely low thermal expansion coefficient. Lw1 has become the material of choice for aviation control systems, microlithography, telescope mirrors, and any other application where temperature extremes could adversely affect the performance of precision instruments.
| Physicochemical Properties | |
| Density | 2.54 |
| Young's Modulus | 90.67 |
| Poission's Ratio | 0.246 |
| Refractory Index | 1.54 ± 0.01 |
| Expansion Coefficient | 0 ± 1.0 |
| Knoop Hardness | 626 |
| Humidity Resistance | 1 |
| Acid Resistance | 3 |
| Durability of Acid DA |
0.03% weight loss in 65°C chromic acid solvent for 1h 0.28% weight loss in 80°C hydrochromic acid solvent for 1h |
| Transmittance (visible light) | T5mm > 90% T10mm > 85 |
| Bubble and Inclusion | B |