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Heat-resistant Glass
Our ordinary plate glass is a soda-lime glass. Whether it is annealed or tempered is just a matter of how quickly it was cooled from a high temperature state. When referring to heat-resistant glass people are usually speaking about borosilicates and glass-ceramics. We have included ordinary tempered glass here as well since it is commonly used for some high-temperature applications.
Tempered Glass
Service temperature 400° F to 450° F
Extreme temperature 500° F
High co-efficient of thermal expansion - less resistant to thermal shock
Common uses: kitchen hot plates, fireplace screens (usually not door glass)
Pyrex™ - a borosilicate
Service temperature 450° F
Extreme temperature 900° F
Low co-efficient of thermal expansion - less resistant to thermal shock
Common uses: Fireplace doors, halogen light covers, wood stoves, and more.
Robax™ - a glass-ceramic
Operational temperature range -400° F to 1400° F
Extreme temperature 1400° F
Very low co-efficient of thermal expansion - very resistant to thermal shock
Common uses: Fireplace doors, halogen light covers, wood stoves, and more.