Selection Guide for Door & Window Rubber Sealing Strips

The structural selection and spec matching of rubber sealing strips are critical to the sound insulation,water tightness and air tightness of doors and windows. Different window types require tailored sealing strip structures. Key selection points are as follows:

1. Casement Windows: Choose D-shaped or P-shaped Hollow Structures

Hollow D/P-shaped strips are ideal for casement windows, as their internal cavity compresses to form an air buffer layer when the window closes. This layer boosts the fit tightness between the strip, frame and sash, cutting down air and sound leakage. Its sound insulation is 30% higher than solid strips of the same material, effectively blocking outdoor noise. The hollow design also offers superior resilience, resisting plastic deformation from repeated opening and closing for long-lasting sealing performance.

2.Sliding Windows: Opt for U-shaped Winged Structures

Sliding windows tend to have gaps during operation, a problem conventional strips struggle to solve. U-shaped winged strips are engineered for sliding windows: the U-shaped main body clips securely into the frame notch, while the side wings fill gaps in real time as the window slides. This structure delivers exceptional water tightness of 0.3MPa (equivalent to hydrostatic pressure at 3 meters water depth), preventing rainwater penetration and frame mildew even in heavy downpours.

3.Spec Selection: Follow Window Frame Notch Dimensions

Sealing strip specs directly impact compression and sealing effects. **The cross-sectional size of the strip shoul be 15%-20% larger than the notch size**. This ensures sufficient compression to fully seal the gap between the notch and sash when the window closes. A too-small strip causes poor sealing (air, sound, water leakage), while an oversized one increases opening/closing resistance and accelerates strip aging due to over-compression. Always measure the notch width and depth precisely before selecting the right strip spec.