Clad PU foam seal, groove fit, special section

Clad PU foam seal: an open-cell polyurethane foam core wrapped in a thin film, carried on a rigid leg that pushes into the frame groove. The mill states it keeps its spring at high and low temperatures and resists air, water, oil, weather and ageing. Sold by the metre.

The stem is 4.4 mm wide. Dimensions marked on the section drawing: 10/12mm, 6mm, 6mm, 4.4±0.2mm.