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Maxos® Borosilicate Replacement Sight Glass | Boiler Supplies

Quality Borosilicate Flat Glass Circles

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Quality Borosilicate Flat Glass Circles In Stock

Annealed Borosilicate (Clear): For general service up to 446°F (230°C). Use 1/4" or thicker glass; max 150°F temperature differential.
Tempered Borosilicate (Clear): Handles up to 500°F (260°C) and higher pressure than annealed. Not for corrosive or extreme thermal shock environments.
Cobalt Blue Borosilicate (Blue): Reduces glare for clear flame, smoke, and ash observation in boilers and furnaces. Up to 1/4" thick.
Fused Quartz (Clear): Ideal for labs and high-temp industrial use; continuous operation up to 1742°F (950°C). Optical grade available on request.

Applications: Furnaces, ovens, observation ports, flow indicators, pressure vessels, and tanks.
Tempering Benefits: Enhances strength, scratch resistance, and thermal shock durability.
Shipping: Standard lead time 5–7 days; expedited options available.
Minimum Order: $25.00

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Items to be returned must be approved by Power Plus International, and may be subjected to a restocking fee

Notice: Due to the uncontrollable metal costs, all prices and delivery times are subject to change on a daily basis.

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*NOTE: The products described herein are not manufactured by Patterson-Kelley nor is Power Plus
International in any way associated or affiliated with "PK", Patterson-Kelley, or Harsco Corporation.

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