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Using Weatherstrip Coatings on Frameless Doors

( 05/28/2019 ) Written by: Anaelle

Maximal Protection for Your Minimalist Design

Frameless doors, originally a feature of high-end sports cars, have become fashionable in mass automotive markets. They are not only aesthetically pleasing, but have functional advantages, as well. By eliminating the large pillar that is standard in ordinary framed design, blind spots are reduced, making the vehicle safer to drive. And, with thicker glass and a direct connection to the sealing strip, frameless doors are quieter.

Weatherstrip Coating

The direct connection between window glass and the secondary sealing strip does introduce some challenges, however. While framed doors have glass run channels (grooves made of rubber or plastic that provide a seal for the window glass), frameless doors do not have this protection. Therefore, frameless doors have stricter requirements for the secondary door sealing coating, especially in terms of abrasion resistance and noise reduction. It is well-known in the sealing industry that the goal of achieving abrasion resistance in sealing coatings generally conflicts with the goal of achieving noise reduction. Sipiol® weatherstrip coatings innovatively solve this problem, accomplishing both. The addition of particles in the coating creates a very low coefficient of friction, improving the sliding resistance of the glass, while at the same time easily solving the noise and “squeakiness” of the windows.

In the European market, Sipiol is widely used by automotive OEMs on frameless doors and convertibles. Frameless door designs are popular on new energy vehicles. Specifically, Sipiol 1025-21 can be found on frameless door models by a major electric vehicle (EV) company and also in the secondary door sealing of medium and large EV sport utility vehicles (SUVs).