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�fs windows, leading to the successful development of the S-LEC SAF (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�fs roads. S-LEC SAF 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" In human's most audible sound range from 1000 to 4000Hz, our Acoustic Film achieves 5dB of sound control effect that is higher than those of other normal interlayer films. *Most distinctively high sound control performance in human's most audible sound range from 1000 to 4000Hz *5dB of sound control effect at the maximum compared with other normal laminated glass The effect of 5dB difference in actual environment Top of this page