Acoustic laminated glass
The key challenges car manufacturers face today are to reduce engine, road and wind noise to enhance
cabin comfort. S-LEC™ Sound Acoustic Film for automotive laminated glass remarkably reduces the
transmission of exterior noises, such as traffic, wind, and other disturbing sounds.
The high quality sound insulation of the S-LEC™ Sound Acoustic Film lies in its multi-Layer
extrusion technology where the acoustic PVB layer (core PVB layer) is placed between two PVB
interlayer films (outside PVB layers). This method significantly improves the sound insulation
performance, while maintaining the same basic benefits and thickness of our standard interlayer.
SEKISUI S-LEC is the world’s first to introduce sound insulation multi-layer technology and the
industry leader in sound acoustic PVB interlayer films for automotive laminated glass, enhancing
comfort for the majority of cars around the globe.
Noise in cabins is mainly caused by noise entering through the windshield and noise transmitted
through the body of a vehicle, such as engine, fans, and exhaust noise. There is however more to
cabin noise than just noise transmitted from outside. In addition, pseudo-noise also has a big
impact on a vehicle’s noise reduction. Pseudo-noise is caused by air turbulence vibrations impacting
vehicles’ windshield and windows. The turbulence is created as air passes over the hood, wipers,
A-pillar, and side-view mirrors. Pseudo noise can’t be assessed using Sound Transmission Loss (STL)
testing, which is the most common test method to measure the extent to which sound energy is reduced
as sound passes through certain materials.
Our NEW acoustic grade, SV grade, is developed to improve
the damping performance and significantly reduces vibration noise, which cannot be assessed through
STL testing. Using the film not only in windshields but also in side windows can greatly enhance the
cabin quietness and comfort, making driving a unique, luxurious experience.
Acoustic interlayers for electric vehicles
As CO2 reductions for a better environment is a continuous item on the global vehicle development
agenda, the shift to EVs is rapidly expanding. As a result, noise sources that were previously
hidden by the noise from the engine become recognizable, and glass windows are required to provide
even better sound insulation performance than before.
Laminated glass with S-LEC™ Sound Acoustic Film can reduce the thickness of the glass while
improving sound insulation performance, reducing the weight of the glass and extending the driving
range of EVs.
The effect can be further enhanced with our SV grade.
For glass panoramic roofs, environmental conditions such as wind friction and rain drops create
additional noise levels that occupants can experience inside a vehicle. Acoustic performance for
panoramic glass roofs is a key feature we see in vehicles on the road today.
Combinations with Sound
We offer the following combinations of multiple functions into one film:
- Head-Up Display
S-LEC™ films are currently available in a wide range of standard colours and custom colour
S-LEC films are unique in their ability to offer a wide format gradient
colour that transitions from 2% to >70% Visible Transmittance (Tvis)
enhancing the exterior design and driver experience.
Leave discomfort at the curb. S-LEC™ Solar Control Film with fine
particle dispersion technologies enables comfortable and efficient
vehicle designs for passengers.
S-LEC™ Wedge-shaped Film enables highly focussed, visibly clear HUD
images for a seamless driving experience.