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Fire Resistant Glass - Instructions

Glazing Instructions

  • Do not allow any contact of the glazing's edges with water.
  • Do not install Pyrobel in locations where the glass temperature might exceed 45°C.
  • Always refer to the fire test reports.
  • Avoid all glass to metal contact.
  • Do not exercice any restraint on the glazing.
  • Do not damage the glazing's edges nor the protection tape.
  • Keep the rebates dry and free from agressive products (acids, organic solvents, etc.).
  • Use hardwood setting blocs or equivalent (Shore hardness A 75).
  • Provide an edge clearance of 4-5 mm.
  • Provide front and back clearances of 4-5 mm, using closed cells foam tape.
  • Provide a rebate depth of minimum 20 mm.
  • Apply a neutral silicone sealant immediately after glazing.
Fire Resistant Glass

External Glazing

For external application, or in case of direct solar radiation on the glazing, Pyrobel is available as external grade, with a UV filter. Pyrobel external grade must be correctly orientated, according to its label. The glazing must be either fully bedded using neutral silicone or installed in drained and ventilated rebates and carefully sealed wih a neutral siliconed capping. Outside applications are only permitted if the temperature limit of 45°C is not likely to be exceeded. For further advice on glazing details, please refer to the respective Pyrobel data sheets or to Metalco Glazing technical services.


For applications where fire resistant glasses with a rating of 30 minutes integrity only are required, Metalco Glazing offers Pyrobelite, a new product thinner than Pyrobel but based on the same technology, that offers comparable advantages of clearness, safety, sound reduction and availability in small to large sizes from stock.

Pyrobelite is a laminated glass assembled with only one clear intumescent interlayer. Pyrobelite meets the integrity criterion of BS 476:Part 22:1987 for a duration of 30 minutes.

Contrary to the other monolithic fire resistant integrity glasses that remain clear when exposed to fire, Pyrobelite turns opaque as its interlayer expands. This characteristic reduces the heat transfer through the glazing and ensures a safe and panic-free evacuation of the building.

Last but not least, the protection offered by Pyrobelite after formal integrity failure is still very effective, as the glazing is not likely to collapse suddenly into small glass pieces. Pyrobelite is available as 7 mm glazing for interior use and 11 mm glazing for outside use or high safety applications (class A according to BS 6206).


Glasses may be heat-treated to enhance their resistance to mechanical and thermal shocks.


Heat Strengthend Glass

Thermally Toughened Glass

Thermally Toughened HST Glass

Tempered glass table