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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Glass consultant longitudinal DIN 7081

All information is provided without guarantee. Errors and omissions excepted.

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Portrait von Dirk Göttgens
Portrait von Dirk Göttgens

Would you like personal advice?

Benefit from our expert knowledge in process monitoring. Our experienced team will provide you with sound advice when selecting the ideal sight glass fittings for your specific requirements. Schedule your personal consultation now!
Dirk Göttgens
Executive management
0049 (0) 2461 91634 00
dg@aci24.com
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Search... Your entries are invalid! Please contact us! Possible working pressure: Required thickness: Maximum temperature: This is a standard sight glass that we would be happy to manufacture for you. This is a sight glass according to DIN This is a sight glass according to DIN , which we would be happy to manufacture for you.