High-Quality DIN7081 Reflex Level Gauge Glass for Boilers

The quality of a sight (gauge) glass depends mainly on the chemical composition and mechanical strength of the glass material. Constant glass quality is provided through glass analyses and acid/alkaline tests. The mechanical strength is attained through thermal prestressing. The glass material is the most important component of the liquid level gauge. We manufacture our gauge glasses ourselves and use exclusively "extra-hard" borosilicate glass, which is subsequently heat-treated. LUMlGLAS gauge glasses have high mechanical strength and are exceptionally resistant to alkali and acids and boiler water (within the service limitation). Our glass testing laboratory carries out continuous quality control tests: purity of glass, flaws in glass, dimensional accuracy, etc. This ensures the high-quality standard of LUMIGLAS gauge glasses. We manufacture reflex and transparent glasses according to the most varied international standards.

• Standards-grade reliability: Produced to DIN 7081 requirements for level gauge glass to ensure consistent mechanical and thermal performance.

• Excellent chemical resistance: Borosilicate composition delivers superior resistance to acids, alkalis, and many process media compared with soda-lime glass.

• Wide operational temperature range: Depending on tempering and product variant, borosilicate level glasses can be used in high-temperature services (usage up to ~350 °C for certain toughened variants). Always verify with the specific product datasheet for your operating conditions.

• Strong thermal stability: Low coefficient of thermal expansion reduces risk from thermal shock during process upsets.

• Versatile visibility options: Available as transparent (flat) gauge glass for direct visual readout and reflex gauge glass (prismatic surface) for improved contrast in opaque or dark fluids.

Boilers, pressure vessels, reactors, storage tanks, separators, and anywhere accurate, reliable visual liquid-level monitoring is required in petrochemical, chemical, power generation, and pharmaceutical industries.

Packing & Delivery

Packing: Each piece of glass is individually packed and  in cartons

MOQ: 10 pieces. 

Delivery time: 7 days. 

Sample policy: Samples available. 

Why Choose Us

Lumistar Special Glass Technology Co., Ltd. is a national high-tech enterprise mainly engaged in the research and development, design, manufacturing, and processing of various types of ultra-high pressure glass windows and safety protection equipment, including high temperature and high pressure glass, ultra-high pressure glass tubes, ultra-high pressure glass mirrors, ultra-low temperature glass, oil well ultra-high pressure glass blasting discs, sapphire glass, microcrystalline ceramic glass, pipeline mirrors, pressure vessel mirrors, high vacuum observation windows, ultra-high pressure alkali resistant mica glass mirrors, high pressure level gauge aluminum silicon glass, explosion-proof spotlights, bulletproof and explosion-proof glass, sintered mirrors, bulletproof security posts, and bulletproof transparent materials.

• Safety-first materials & testing — for reliable visual windows.

• Engineering-ready — CAD, datasheets, and clear dimensions provided. 

•  Reduce downtime — correct specs and fast technical support. 

•  Honest pricing & practical MOQ — minimize your procurement risk. 

•  Responsible packing & on-time delivery — parts arrive ready to install.