Weatherseal performance matters in windows, that's why our windows are supplied with Q-Lon pre-inserted into all sections.
Trust the world's best weatherseal gasket.
Great Performance everytime
The charts below show the compression performance and set when compared with competitor gaskets, this demonstrated the recovery of the gasket after compression thus ensuring consistent performance after your windows are opened and closed, particularly if they are left closed for a long time.
The graph below shows the weather performance against competitor gaskets and demonstrates that Q-Lon provides less air leakage over a wide temperature range when compared to our competitors.
Setting the standard
Expanding the choice
Unrivalled thermal and acoustic insulation
The world’s best weatherseal gasket. Excellent compression recovery of 99%.
Window Energy Rating – The future of energy efficient windows from the BFRC.
Our comprehensive suite of products are available in a range of standard and prestige finishes.
Achieved using three panes of glass which create two insulating cavities.