Borosilicate Glass for Industrial Sight Glasses & Process Equipment

Industrial Borosilicate Glass — The Standard Material for Process Sight Glasses

Borosilicate glass is the primary material used in industrial sight glasses, level gauges, and observation windows across the chemical, petrochemical, pharmaceutical, oil & gas, and power generation industries. Composed of silica and boron trioxide (B₂O₃), borosilicate glass offers a unique combination of thermal shock resistance, chemical inertness, and mechanical strength that makes it indispensable for demanding process environments.

Key Technical Properties

• Thermal shock resistance: withstands rapid temperature changes (ΔT up to 120°C)
• Maximum continuous operating temperature: 450°C
• Low coefficient of thermal expansion: 3.3 × 10⁻⁶/K (borosilicate 3.3)
• Chemical resistance: resistant to acids, alkalis, solvents, and process fluids
• High optical clarity for accurate visual process monitoring
• Meets DIN 7080, DIN 7081, DIN 8902 standards for sight glass applications

Industrial Applications

• Flat gauge glass for liquid level gauges (DIN 7080 / 7081 strip glass)
• Circular sight glass discs for pressure vessel observation windows
• Borosilicate glass tubes for tubular level gauges
• Reflex and transparent sight glass replacement glass
• Reactor and vessel observation windows
• Pharmaceutical and food-grade process sight glasses

Available Forms

• Flat gauge glass strips — standard DIN sizes and custom dimensions
• Circular discs — custom OD, ID, and thickness
• Borosilicate glass tubes — various OD/ID/length combinations
• Tempered and heat-strengthened options available

Contact us for technical datasheets, standard size availability, OEM supply, and bulk pricing for industrial MRO procurement.