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Spare Parts
Manufactured in 3.3 Borosilicate Glass, these sight glasses are used in several applications where a good chemical resistance and low thermal expansion coefficient are required.
Manufactured from 3.3 borosilicate glass, these sight glasses are used in various applications where good chemical resistance and a low coefficient of thermal expansion are required. Poor chemical resistance can cause the glass to react and release unwanted substances in the process, such as when non-borosilicate glass reacts with water. Special dimensions are available upon request, where the minimum diameter is 2/5" and the maximum diameter is 13.78". Thickness can be manufactured from a minimum of 1/8" and a maximum of 1 3/8".
| Property | Testing method | Obtained value |
|---|---|---|
| Thermic dilatation coefficient | ISO 7991 | 3.3 × 10⁻⁶ |
| Density at 25°C | SN 7005 13 | 2.23 g/cm³ |
| Refractive index (λ = 587.6 nm) nd | — | 1.472 |
| Maximum annealing temperature | ISO 7884-8 | 1040 ºF |
| Short-term maximum temperature | ISO 7884-7 | 932 ºF |
| Thermal shock resistance | ISO 7884-4 | 5.67 ºF |
| Young's modulus | — | 63 150 MPa |
| Poisson constant | — | 0.2 |
| Thermal conductivity 20°C – 100°C λ | — | (1.2) (w·m⁻¹)(K⁻¹) |
| Photoelastic constant | DIN 52314 | (4.00 × 10⁻⁶) (mm²/N) |
| Specific electrical resistance 10⁸ Ωcm | DIN 52326 | 482 ºF |
| Dimensional tolerance diameter | DIN 7080 | PASS |
| Property | Testing method | Obtained value |
|---|---|---|
| Hydrolytic resistance | ISO 719 | HGB 1 |
| Acid resistance | ISO 1776 | CLASS S1 |
| Alkaline resistance | ISO 695 | CLASS 2 |
| Chemical composition SiO₂ | — | Minimum content 80% |
| Chemical composition B₂O₃ | — | Minimum content 13% |
| Chemical composition Na₂O + K₂O | — | Minimum content 4.5% |
DIN parameters cover pressure resistance in terms of total diameter, observable diameter, and glass thickness, as well as permissible imperfections, chemical attack, markings, and dimensional tolerances.
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Contact us with your application details — pressure, media, and connections — and we will help you specify the right sight glass.