Heat-Strengthened Glass
Glass that has been heated and cooled similarly to tempered glass but at a slower rate, resulting in approximately twice the strength of annealed glass while breaking into larger pieces than fully tempered glass.
Technical Details
Heat-strengthened glass is produced by heating glass to approximately 1,100°F and then cooling it more slowly than tempered glass. This creates surface compression between 3,500-7,500 psi (compared to 10,000+ psi for tempered glass). It does not qualify as safety glazing on its own but is commonly used as a component in laminated glass assemblies.
Frequently Asked Questions
What is the difference between heat-strengthened and tempered glass?
Heat-strengthened glass has about half the surface compression of tempered glass (3,500-7,500 psi vs 10,000+ psi). It breaks into larger pieces and does not qualify as safety glazing alone, but is commonly used in laminated configurations.
Related Terms
See It in Action
Explore real-world applications featuring heat-strengthened glass: