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Q Lon Weatherseal Gasket

Weatherseal performance matters in windows, that’s why the Eagle Collection is 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.

Q Lon Weatherseal GasketQ Lon



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.

Q Lon Graph



Progress Windows fitted fascias, soffits, a porch and fence for us. We were so delighted with the finished job that we decided to have the back windows replaced as well. The workmen were really friendly and nothing was too much trouble. We can highly recommend Progress Windows.



Christine & Brian S

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