Heat strengthening furnace

Heat Strengthening

Located in our 30,000 sqft factory in Cambridgeshire, our state-of-the-art Cooltemper furnace heat strengthens glass for durability where it can be used for a variety of uses. Our heat strengthened glass effectively offers greater resistance to thermal loads than standard annealed glass.

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Stand-alone heat-strengthened glass is not a safety glass, as when it’s broken the fragments are typically larger than fully toughened glass.


Heat-strengthened glass can be enhanced and used as a safety glazing material, by applying heat strengthened laminate to the process. Combined with our in-house lamination process, we can provide 9.5 and 13.5 heat strengthened laminated glass for a variety of commercial uses.

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Technical Information

A transparent and technically sound manufacturing process is incredibly important to us at Holloseal. Have a browse through our brochures and compliancy documents to understand why we are one of the UK's leading heat strengthening glass manufacturers and suppliers.

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Latest Projects

With a clear vision of the perfect sealed unit firmly within our sights, our extensive technical expertise allows us to confidently exceed expectations showcased via a diverse collection of architectural glazing projects - from ground-level treatments to bespoke curtain walling.

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Our Partners we work with ....

Guardian Glass
Asahi Glass Company
Saint Gobain