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Borosilicate / Pyrex

Cat-i Glass maintains a large stock of raw material on site to meet most customers’ glass fabrication needs. This allows us to provide some of the fastest response times in the glass fabrication industry. Should you require a type of glass not in our stock, we can get it quickly thanks to our excellent relationship with our suppliers.

Borosilicate is known for its heat and chemical resistance. We carry different types and thicknesses in stock:

  • 0.7-25.4 mm Schott Borofloat 33
  • 1.0 mm Corning 1737
  • Tubing and Rod


Borosilicate is different from regular glass because it has a much higher melting point and lower coefficient of expansion. Therefore it performs well in different temperature extremes and environmental conditions. For these reasons, it is commonly used in:

  • Appliances
  • Lighting
  • Medical Applications
  • Sight Windows

Borosilicate was invented in the late 1800’s by German glassmaker Otto Schott. It derives its unique properties from its unique chemical composition – boron oxide replaces the soda and lime of regular glass. This mixture binds all the chemicals more tightly together, leading to a much higher melting point.

The softening point of Soda Lime and Low Iron glass is 696 degrees Celsius compared to 821 degrees Celsius for borosilicate. It is also more durable than Soda Lime and Low Iron glass. On the Mohs scale of mineral hardness which rates a diamond as 10 and chalk as 1, borosilicate comes in at 7.5 and the other types of glass at 6. Borosilicate can be heat strengthened, but it cannot be safety tempered because of its low expansion properties.


Cat-i Glass is a distributor of Schott glass products



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