Cobalt Blue Borosilicate Glass — Industrial Sight Glass & Level Gauge Glass

Cobalt Blue Borosilicate Glass for Industrial Applications

Cobalt blue borosilicate glass is a specialty industrial glass produced by incorporating cobalt oxide into the borosilicate glass matrix. The distinctive deep blue color serves a functional purpose in industrial environments: it reduces glare from bright process flames and high-intensity light sources, making it easier for operators to observe fluid levels and process conditions in boilers, furnaces, and high-temperature reactors.

Key Properties

• Deep cobalt blue tint — reduces glare from flames and radiant heat sources
• Borosilicate glass 3.3 base — superior thermal shock resistance
• Operating temperature: up to 450°C continuous
• Chemical resistance to acids, alkalis, and process fluids
• Meets DIN 7080 / DIN 7081 standards for sight glass applications
• Available in flat disc, strip, and custom-cut formats

Typical Applications

• Boiler drum level gauge glass (replacement for standard clear glass)
• Sight glasses on furnaces and combustion chambers
• High-temperature reactor observation windows
• Refinery and petrochemical process sight glasses
• Steam generator level indicators

Available Formats

• Flat gauge glass strips (DIN 7080 / 7081 standard sizes)
• Circular sight glass discs (custom OD/ID)
• Custom shapes and dimensions on request

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