Manufacturer page.

Q-Lon sealing strips consist of a rigid core overlaid with highly elastic PU foam with a smooth, dirt-repellent, and hard-wearing PE foil. Q-Lon sealing strips are used in construction, e.g., on windows and doors, and meet all conceivable requirements for an optimal, long-lasting seal. Q-Lon strips do not have to be welded or glued in corners but simply mitred using special cutters. Q-Lon has been extensively tested by independently certified test facilities that clearly demonstrate its superior performance over other commonly used seal materials and constructions. It has been shown that Q-Lon seals retain their properties and performance significantly better over time when, after 10,000 cycles of window and/or door opening and closing, other materials lose their ability to meet the normal operational requirements.