Shanghai Longway Special Glass Co., Ltd.
                                                                                                           
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Since 2008
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High Temperature Resistant Tempered Glass Gauge Glass for Boiler Water Level Indicator & Pressure Vessel

Price Negotiable
Price: NEGOTIATION
MOQ: 600 pieces
Delivery Time: Negotiable
Brand: LONGWAY
Product Description



High Temperature Resistant Tempered Glass Gauge Glass for Boiler Water Level Indicator & Pressure Vessel


1. Core Material & Manufacturing:

  • Base Material: High-quality, optically clear soda-lime glass or borosilicate glass.

  • Key Process: Precision-cut glass that undergoes thermal tempering and often chemical strengthening to create tempered gauge glass.


2. Defining Physical & Performance Properties:

  • Extreme Temperature & Pressure Resistance: Specifically engineered to withstand the high internal temperatures (up to 300°C+) and pressures of steam boilers and vessels without failing.

  • Thermal Shock Resilience: Withstands rapid temperature fluctuations between steam/water phases and ambient conditions without cracking.

  • High Mechanical Strength: Tempering provides superior resistance to vibration, mechanical stress, and hydraulic pressure compared to ordinary glass.

  • Chemical Durability: Resistant to corrosion and etching from hot water, steam, and common boiler water treatment chemicals to maintain long-term clarity.

  • Safety Feature: Designed to contain failure, often fragmenting into less hazardous granular pieces if critically overstressed.


3. Primary Function in a System:

  • Critical Visual Monitoring Component: Serves as the transparent window in a water level gauge or sight glass, allowing for direct, real-time visual inspection of liquid levels inside a sealed vessel.

  • Safety & Process Control: Enables operators to safely monitor boiler water levels to prevent dangerous dry-firing or overfilling, which is vital for operational safety and efficiency.

  • Pressure Boundary: Forms an integral part of the pressure-containing assembly, maintaining a leak-proof seal under demanding conditions.


4. Target Applications & Industries:

  • Steam Boilers & Generators: For fire-tube, water-tube, and electric boilers in industrial plants, laundries, and hospitals.

  • Industrial Pressure Vessels: Reactors, autoclaves, condensers, and tanks requiring level sighting.

  • Power Generation: In fossil fuel and biomass power stations for boiler drum level indication.

  • Marine & Locomotive: For steam boilers on ships and heritage steam engines.

  • Heating Systems: In large commercial and institutional heating systems.


Item Gauge glass, Sight glass
Material  borosilicate glass, Float glass, borofloat
Diameter Tolerance +0/-0.2 mm
Thickness Tolerance +/-0.2 mm
Processed By Cutting,Grinding,Tempering, Polishing
Working temperature Resisting high temperature shock
Surface Quality 80/50,60/40
Material Quality No scratches and air bubble
Transmission >90% for visible light
Chamfer 0.1-0.3 mm x 45 degree
Surface Coating Available
Usage Photography, Optics, Lighting system, industrial area.







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Have questions about our products or want to discuss a custom order? Our team is ready to help you.

Company Shanghai Longway Special Glass Co., Ltd.
Location Rm. 2111, Bldg. A, Tomson Center, No. 188, Zhangyang Rd., Shanghai, China
Contact Person Dai

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