Acoustic PVB TechnologyAcoustic PVB Technology Extending the Frontiers of Extending the Frontiers of

Performance GlazingPerformance Glazing

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TopicsTopics

• Introduction to sound

• Basic principles of acoustics

• Glazing acoustical performance

• Acoustic PVB technology

• Summary

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What is Sound?What is Sound?

• Pressure waves in air

• Intensity can be measured at different wavelengths or frequencies

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Human Audio CapabilityHuman Audio Capability

• Human ear is sensitive to sound in range of 500-8000Hz

Hearing range 20 – 20k Hz

Most sensitive hearing 500 – 8k Hz

Human voice range 100 – 8k Hz

Key voice range for conversation

2k – 6k Hz

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Threshold of HearingThreshold of Hearing

Most sensitive

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Acoustics : Basic PrinciplesAcoustics : Basic Principles

Sound Transmission Loss of a material

=ability to minimize sound

passing through it

..SourceReceiver

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0

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63 100 160 250 400 630 1000 1600 2500 4000 8000

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6mm mono

Sound Transmission LossSound Transmission LossSpectrumSpectrum (eg. : Monolithic Glass) (eg. : Monolithic Glass)

Critical Frequency Dip

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Sound Transmission RatingSound Transmission Rating

A single number rating method to allow asingle value to be given to a TL spectrum.

– Sound Transmission Class, STC– Outdoor-Indoor Transmission Class, OITC– Weighted Sound Reduction Index, Rw

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Glazing Acoustical PerformanceGlazing Acoustical Performance

• Various types of glazing configurations :

Multi-ply Laminated

Laminated Insulating

Double Laminated Insulating

InsulatingMonolithic Laminated

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Glazing Acoustical PerformanceGlazing Acoustical Performance

• The three basic features – Glass thickness– Insulating glass air space thickness– Interlayer damping

Glass

Spacer

Interlayer

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• Increase in glass thickness will increase sound insulation performance

• Highest STC for readily available glass is

~37 (for 12 mm glass)

Glazing Acoustical Performance Glazing Acoustical Performance

Increasing Glass ThicknessIncreasing Glass Thickness

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12mm mono10mm mono6mm mono3mm mono

Glazing Acoustical Performance Glazing Acoustical Performance

Increasing Glass ThicknessIncreasing Glass Thickness

STC 29

STC 32

STC 35

STC 37

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• Creating an air space between two panes of glass also increase sound isolation performance

• Usually is most effective for an air space thickness >12mm

Glazing Acoustical Performance Glazing Acoustical Performance Airspace Insulating GlassAirspace Insulating Glass

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Glazing Acoustical Performance Glazing Acoustical Performance Airspace Insulating GlassAirspace Insulating Glass

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63 100 160 250 400 630 1000 1600 2500 4000 8000

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6mm - 25mmAS - 6mm

6mm - 12mmAS - 6mm

12mm mono

6mm mono

STC 37

STC 32

STC 40

STC 42

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• Using an interlayer in between 2 panes of glass (laminated glass) can create damping effect.

Glazing Acoustical Performance Glazing Acoustical Performance Laminated GlassLaminated Glass

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0

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3mm - 0.76mmSaflex - 3mm

6mm mono

Glazing Acoustical Performance Glazing Acoustical Performance Laminated GlassLaminated Glass

STC 34

STC 32

Critical Frequency Dip

Damping Performance

from Interlayer

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Glazing Acoustical Performance Glazing Acoustical Performance Double Laminated Insulating GlassDouble Laminated Insulating Glass

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6.76mm -25mm AS -6.76mm

6mm - 25mmAS - 6mm

STC 44

STC 42

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Acoustics PVB TechnologyAcoustics PVB Technology

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• PVB based interlayer with added damping properties compared to regular PVB.

Acoustics PVB TechnologyAcoustics PVB Technology

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• similar safety and impact performance compared to regular PVB of same thickness.

• added acoustic damping properties, enabling better sound insulating performance.

• no special handling & processing required from lamination standpoint.

Acoustics PVB TechnologyAcoustics PVB Technology

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0

10

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63 100 160 250 400 630 1000 1600 2500 4000 8000

One-third Octave Band Frequencies (Hz)

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3mm - 0.76mmSaflex QS - 3mm

3mm - 0.76mmSaflex - 3mm

6mm mono

Acoustics PVB Technology Acoustics PVB Technology Sound Transmission Loss (6mm)Sound Transmission Loss (6mm)

STC 34

STC 32

STC 35

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Ford Focus

Mercury Milan

Buick Enclave

Buick Lacrosse

Ford Taurus

Mercedes S Class

Automotive AdoptionsAutomotive Adoptions

Ford F150 Platinum

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• Sound is pressure wave in air.

• Human ear is sensitive to sound in range of 500-8000Hz & respond is not linear

• Acoustic performance of glazing can be expressed by TL spectrum or single value rating.

• Acoustical performance of glazing can be improved by increasing glass thickness, air-space or using damping interlayer.

• Acoustic PVB uses tri-layer technology to further improve acoustic performance of glazing while maintaining the requirements of safety glass.

SummarySummary

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