About us NP Polytech are specialists in the supplies ready-made and custom-made of PVC & TPV glazing gaskets, weather stripping and weather seals and sealing system to the window, door, curtain wall and building industries.NP Polytech product quality and customer satisfaction is our business with high standard of quality control to ensure superior quality components.NP Polytech manufacturers and distributes weather seals, weather stripping, extruded seals, door sales and glazing gasket to the window and door system.