There are gaskets. Then there’s Q-Lon – it has excellent compression recovery of 99%, giving constant height at corners for improved weathering and does not produce weld sprue. Furthermore, it provides low operating forces on gearing which in turn ensures ease of operation for the user. Weatherseal performance matters in windows, that’s why the Diamond Suite is supplied with Q-Lon pre-inserted into all sections.

Made with a unique combination of materials and with technical performance unparalleled by any other material used in weatherseals, Q-Lon offers the highest standard of sealing function – even under extreme conditions. Continuous research and development, as well as strict material inspection and quality inspections, have made Q-Lon one of the best established sealing systems in the industry today.