MAXOS® safety sight and level gauge glasses made of SUPRAX® 8488 are perfect for temperatures up to 300 °C. For higher operational temperatures we recommend safety sight and level gauge glasses made of aluminosilicate glass. These are used due to a Tg of 630 °C in applications with high temperatures up to 375 °C. It is mandatory to protect the inner side of the glass (i.e. side facing steam or liquid) with mica shield to avoid fast chemical attack.
| Pressure and thermal load | |
|---|---|
| Max. pressure | 225 bar / 3.263 psi |
| Max. temperature | 375 °C / 707 °F |
| Thermal shock resistance acc. to ISO 718 | ΔT 230 °C |
| Surface compressive stress | |
|---|---|
| s = 100 - 140 MPa (N/mm²) | |
| Coefficient of expansion | |
|---|---|
| α 20 / 300 4,8 x 10-6 K-1 | |
| Chemical characteristics | ||
|---|---|---|
| Hydrolytic resistance acc. to | ISO 719 | Class 1 |
| Acid rsistance acc. to | ISO 12116 | Class 3 |
| Alkali resistance acc. to | ISO 695 | Class 3 |
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