SEKIUSI
S-LEC Film Division Digital Movie・Catalog



Quietness greatly boosts car comfort, and how to reduce engine, road, and wind noise are major issues in vehicle design. SEKISUI has focused on the fact that noise enters through the car’s windows, leading to the successful development of the S-LEC™ Sound Acoustic Film sound insulation interlayer film that dramatically increases sound insulation performance. This film is employed in cutting-edge and environmentally-friendly vehicles, as well as in a variety of other cars on the world’s roads.



Three layers made of ultra-thin sheets shut out sound.

S-LEC™ Sound Acoustic Film sound insulation interlayer film is achieved by the three-layer extrusion technology that produces a film consisting of a sound insulation layer (core layer) and two layers of standard interlayer film (external layers) that sandwich the core layer. With this technology, the sound insulation performance of the film is improved while it also maintains the basic performance of standard interlayer films.

Article:"Multi-Layer Technology for Noise Reduction"


[Sound Insulating]The loudest sound range is made quietest.

In humans, most audible sounds range from 1,000 to 4,000Hz. The Sound Acoustic Film improves the sound insulation effect by 5dB compared with standard interlayer films. These frequencies are very similar to the frequencies of the sound of wind, a source of loud noise when an automobile is in motion, and therefore, the noise of wind is substantially reduced. Furthermore, the film’s superior damping performance effectively controls 100 to 500Hz frequency vibration energy from the engine and reduces the noise that resonates across the glass.




  • Differences in sound insulation performance most pronounced for sounds in the range of 1,000 to 4,000Hz to which the human ear is most sensitive.
  • S-LEC™ Sound Acoustic Film realizes sound reduction differences of over 5dB at most compared with standard laminated glass.