Auer Lighting offers various shapes and designs of coated filters using BOROFLOAT® 33, a floated borosilicate glass 3.3. The material combines superior transmittance with high thermal and mechanical stability.
| Linear thermal expansion coefficient α 20/300°C [K-1] | 3.3 x 10-6 |
| Permanent operating temperature [°C] | 450 |
| Short-time operating temperature [°C] | 500 |
| Refraction index nd (λ= 587.6 nm) | 1.471 |
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