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Verusil is a transparent, synthetic fused silica. It is manufactured solely from synthetic raw materials using a special Sol-Gel process.
It is characterized by its high chemical purity. Verusil typically has an OH-Content of approx. 300 ppm and is mainly used in optical (non-imaging), analytical and technical applications.
By applying a special subsequent purification step, the purity of Verusil can be further increased on request and the content of OH groups can be reduced to almost zero.
Thermal Properties
| Thermal expansion coefficient: | 5.5 x 10-7 • K-1 (20 °C – 500 °C) |
| Softening point: | 1,460 °C |
| Max. working temperature - short term: | 1,100 °C |
| Max. working temperature - long term: | 925 °C |
| Thermal expansion coefficient: |
| 5.5 x 10-7 • K-1 (20 °C – 500 °C) |
| Softening point: |
| 1,460 °C |
| Max. working temperature - short term: |
| 1,100 °C |
| Max. working temperature - long term: |
| 925 °C |
Chemical Properties
| Trace impurities [ppm / weight] | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Al | Ca | Cu | Fe | K | Li | Mg | Na | Ti | Zr |
| < 0,50 | < 0,75 | < 0,02 | < 0,30 | < 0,75 | < 0,02 | < 0,10 | < 0,30 | < 0,05 | < 0,05 |
| Trace impurities [ppm / weight] | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Al | < 0,50 | ||||||||
| Ca | < 0,75 | ||||||||
| Cu | < 0,02 | ||||||||
| Fe | < 0,30 | ||||||||
| K | < 0,75 | ||||||||
| Li | < 0,02 | ||||||||
| Mg | < 0,10 | ||||||||
| Na | < 0,30 | ||||||||
| Ti | < 0,05 | ||||||||
| Zr | < 0,05 | ||||||||
| OH-Content: | appr. 300 ppm / weight |
| Acid resistancy: | acc. Class 1, DIN 12 116 |
| Alkali resistancy: | acc. Class 1; DIN 52 332 |
| OH-Content: |
| appr. 300 ppm / weight |
| Acid resistancy: |
| acc. Class 1; Din 12 116 |
| Alkali resistancy: |
| acc. Class 1; DIN 52 322 |
Mechanical Properties
| Density: | 2,20 g / cm³ |
| Modulus of elasticity: | 70 kN / mm² |
| Bending strength: | 68 N / mm² |
| Density: |
| 2,20 g / cm³ |
| Modulus of elasticity: |
| 70 kN / mm² |
| Bending strength: |
| 68 N / mm² |
Optical Properties
| Bubble class: | 0, acc. DIN 58927 |
| Refractive index: | 1,4770 @ 350 nm |
| Bubble class: |
| 0, acc. DIN 58927 |
| Refractive index: |
| 1,4770 @ 350 nm |
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