Sealing strips play an important role in waterproofing, sealing and energy saving in plastic steel doors and windows, aluminum bridges and wooden doors and windows with broken bridges, sound insulation, dustproof, antifreeze and warmth. It must have strong tensile strength, good elasticity, and also need good temperature resistance and aging resistance. In order to ensure the tightness of the rubber strip and the profile, the cross-section structure size of the rubber strip must match the plastic steel door and window profile. Sealing rubber strips are generally used for casement doors and windows, hanging windows, and folding doors and windows. The main functions are dustproof, insect-proof, waterproof, soundproof, and sealed.