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Background

The key challenges facing car manufacturers today are reducing engine, road and wind noise to enhance cabin comfort. Sekisui dedicates their efforts and interlayer PVB technologies to further improve sound transmission loss. S-Lec Film for automotive laminated glass dramatically reduces the transmission of exterior noises, such as traffic, wind, and other ambient disturbances.

Technology

Three-layered technology that collectively absorbs unwanted noise

S-LEC™ Sound Acoustic Film is composed of two layers of normal resin and an interior layer of sound control resin.

S-LEC™ Sound Acoustic Film is constructed from a patented three-layer extrusion technology. The outer layers provide mechanical strength and enable adhesion to the glass. The inner layer absorbs unwanted sound frequencies. With this technology, the sound insulation performance is improved, and still maintains the functionality of standard interlayer film.

Performance

Unwanted audible sound and noise disturbances experienced within the automotive cabin, such as traffic and wind, are located in the 1,000 to 4,000 Hz range. S-LEC™ Sound Acoustic Film improves sound transmission loss of these noises by 10dB compared to standard PVB interlayer film. S-Lec Film’s superior dampening performance controls low frequency vibration energy from the engine (100 to 500Hz) that resonates across the windshield.

Acoustic Technologies Outperforming Standard Product in Audible Range

S-LEC™ Sound Acoustic Film technology outperforms standard laminated glass performance in the audible range.
S-LEC™ Sound Acoustic Film technology outperforms standard laminated glass performance in the audible range.
  • Differences in sound insulation performance are most pronounced for sounds in the range of 1,000 to 4,000Hz to which the human ear is most effective.
  • S-LEC™ Sound Acoustic Film attains sound reduction of 10dB compared with normal laminated glass.