Molded borosilicate SUPRAX(R) 8488 glass disks to be used as a replacement for the glass in sight flow indicators, sight windows, bull’s eyes, and boiler flame view peep sights. The glass we offer is often the very same as was installed by the original equipment manufacturer.
In some cases upgrades for higher temperature and pressure are available.
Annealed (non-tempered) Borosilicate Circles are stocked in many diameters and thickness. The borosilicate material we use is Auer SUPRAX(R) 8488, similar to Schott Borofloat, or Tempax. Both have excellent optical properties for maximum visibility. Annealed borosilicate offers exceptional mechanical strength and corrosion resistance. You can feel confident using annealed "boro" in many applications throughout your plant.
Tempered Borosilicate Circles are heat hardened to give that added measure of mechanical strength needed in applications where higher pressures and greater working temperatures are present. Tempered "Boro" with its greater surface hardness and bend resistance, offers a greater margin of safety in most applications.
MAXOS® Annular Edge Replacement Circles are a size for size replacement for Pyrex Brand Annular Edge sight glass. MAXOS® is clearly a better choice!
MAXOS® sight glass is available in the exact same diameters and thickness as Annular Edge Sight Glass. MAXOS® is molded from specially formulated borosilicate 8488 glass, which gives it a superior quality over cut and ground glass. MAXOS® has a 3/4" uniform thickness as compared to a 5/8" minimum thickness of the Pyrex Annular Edge. This gives MAXOS® an extra margin of safety for your application. The MAXOS® molding process produces a uniform product with excellent optical clarity, and greater thermal shock resistance at an economical price. Testing procedures subject the sight glass to 8 times its rated pressure for maximum user safety. The SUPRAX(R) 8488-borosilicate features chemical attack resistance to all acids except hydrofluoric and hot phosphoric. MAXOS® disks are suitable for temperatures up to 572°F at atmospheric pressure. Shields* may be used on MAXOS® disks as needed for service conditions.
MAXOS® Molded Circles, stocked in many sizes, are molded from specially formulated borosilicate 8488 glass, which gives it a superior quality over cut and ground plate glass. MAXOS® molding process produces a uniform product with excellent optical clarity, and greater thermal shock resistance at an economical price. Testing procedures subject the sight glass to 8 times its rated pressure for maximum user safety. SUPRAX(R) 8488-borosilicate features chemical attack resistance to all acids except hydrofluoric and hot phosphoric. MAXOS® disks are suitable for temperatures up to 572°F at atmospheric pressure. Shields* may be used on MAXOS® disks as needed for service conditions.
The tables on this page list availble MAXOS molded sight glass discs. Although this list represents a great variety of diameters and thicknesses, your application may require a size not shown. In these cases we offer from stock and custom order, sight glass discs made from clear borosilicate place glass. They are avilable in diameters as large as 24" and up to 2.25" thickness. Tempering and hole drilling is also available.
Important Note: Regardless of the glass ratings shown never exceed the gage manufacturer’s pressure and temperature limitations.
For further information refer to the gage or sight window manufacturer’s installation, operation and maintenance instruction manual.
MAXOS® and SUPRAX(R) 8488 are registered trademarks of Auer Lighting, Bad Gandersheim, Germany
*Shields offer some resistance to chemical attack but hinder visibility.