Door and window seals have a smooth surface. In terms of material selection, manufacturers with higher requirements generally use EPDM or thermoplastic EPDM. The main performance of EPDM products: non-toxic, environmental protection, aging resistance, high temperature resistance, stable performance, good summer and winter performance. The steel frame is three-component and is not easy to deform and shrink. Seals for doors, windows and curtain walls. This product has good elasticity and anti-migration ability, which can effectively block noise, dust and wind and rain.