Glass Consultant for Longitudinal Sight Glasses according to DIN 7081
Longitudinal sight glasses made of Borosilicate glass can be used at temperatures up to 243 °C or 280 °C (depending on the design) and with ACI Mica discs protected up to 320 °C. Depending on the geometry and the design (transparent or reflective glass), longitudinal sight glasses made of Borosilicate glass can be used for very high pressures. We are happy to assist you in selecting a suitable glass. Please feel free to contact us.
Technical changes and calculation errors reserved.
Technical Properties
Water resistance according to DIN 12111 (ISO 719) Hydrolysis class 4
Acid resistance according to DIN 12116 Acid class 1
Alkali resistance according to DIN 52322 Alkali class 2
Bending tensile strength up to 150 N/mm² / 21,000 psi
Surface compressive stress ≥ 100–140 N/mm² / 14,500–20,000 psi
Parallelism ≤ 0.20 mm / 0.008 inches
T.W.B. Δ T 265 K
max. operating temperature 300 °C / 572 °F (short-term)
ACI Mica protected 320 °C / 608 °F
Operating Conditions | maximum permissible operating overpressure | maximum permissible temperature | ||
|---|---|---|---|---|
| bar | psi | °C | °F | |
| Transparent sight glasses protected without ACI Mica discs at saturated steam or hot water pressure | 35 | 500 | 243 | 470 |
| Transparent sight glasses protected with ACI Mica discs at saturated steam or hot water pressure | 103 | 1,500 | 320 | 608 |
| Reflective sight glasses at saturated steam or hot water pressure | 35 | 500 | 243 | 470 |
| Reflective sight glasses in use without steam and without technically significant glass attack | 280 | 4,000 | 38 | 100 |
| Transparent sight glasses in use with media without technically significant glass attack | 345 | 5,000 | 38 | 100 |
| High-pressure transparent sight glasses in special fittings | 414 | 6,000 | 38 | 100 |
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