There are gaskets. Then there's QLon - known as the 'rolled in gasket', it has excellent compression recovery of 99%, giving constant height at corners for improved weathering and does not produce weld sprue.
All our windows feature the innovative Q-Lon weather seals. Offering exceptional performance over a wide temperature range, they don’t shrink or stretch. Instead they retain their original shape year after year to maintain an excellent weather seal.
The unique construction actively absorbs noise pollution, increasing acoustic insulation. Immune to rot, mould, mildew, UV and ozone, CFC-free Q-Lon weather seals will last the lifetime of a window.