All our windows are supplied with Q-Lon pre-inserted into all sections.
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.
- Best acoustic and thermal performance across the widest temperature range
- 99% memory recovery
- Retains shape year after year
- Low operating forces reduces wear and tear and gives ease of operation
- Leaves no rigid sprue after welding
- 20 year guarantee.
Great performance every time
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.