Download STC 34 STC 32

Acoustic PVB Technology
Extending the Frontiers of
Performance Glazing
Topics
•
•
•
•
•
Introduction to sound
Basic principles of acoustics
Glazing acoustical performance
Acoustic PVB technology
Summary
2
What is Sound?
• Pressure waves in air
• Intensity can be measured at different
wavelengths or frequencies
3
Human 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
4
Threshold of Hearing
Most sensitive
5
Acoustics : Basic Principles
Sound Transmission Loss
ability to minimize sound
=
of a material
passing through it
.
Receiver
Source
6
Sound Transmission Loss
Spectrum (eg. : Monolithic Glass)
Sound Transmission Loss (db)
60
50
40
30
6mm mono
20
Critical
Frequency Dip
10
0
63
100
160
250
400
630
1000
1600
2500
4000
8000
One-third Octave Band Frequencies (Hz)
7
Sound Transmission Rating
A single number rating method to allow a
single value to be given to a TL spectrum.
– Sound Transmission Class, STC
– Outdoor-Indoor Transmission Class, OITC
– Weighted Sound Reduction Index, Rw
8
Glazing Acoustical Performance
• Various types of glazing configurations :
Monolithic
Insulating Laminated
Laminated Double Laminated
Insulating
Insulating
Multi-ply
Laminated
9
Glazing Acoustical Performance
• The three basic features
– Glass thickness
– Insulating glass air space thickness
– Interlayer damping
Interlayer
Glass
Spacer
10
Glazing Acoustical Performance
Increasing Glass Thickness
• Increase in glass thickness will increase
sound insulation performance
• Highest STC for readily available glass is
~37 (for 12 mm glass)
11
Glazing Acoustical Performance
Increasing Glass Thickness
Sound Transmission Loss (db)
60
STC 37
50
STC 35
40
STC 32
30
STC 29
20
12mm mono
10mm mono
6mm mono
3mm mono
10
0
63
100
160
250
400
630
1000
1600
2500
4000
8000
One-third Octave Band Frequencies (Hz)
12
Glazing Acoustical Performance
Airspace Insulating Glass
• Creating an air space between two panes
of glass also increase sound isolation
performance
• Usually is most effective for an air space
thickness >12mm
13
Glazing Acoustical Performance
Airspace Insulating Glass
STC 42
Sound Transmission Loss (db)
60
STC 40
50
STC 37
STC 32
40
30
6mm - 25mm
AS - 6mm
20
6mm - 12mm
AS - 6mm
10
12mm mono
0
6mm mono
63
100
160
250
400
630
1000
1600
2500
4000
8000
One-third Octave Band Frequencies (Hz)
14
Glazing Acoustical Performance
Laminated Glass
• Using an interlayer in between 2 panes of
glass (laminated glass) can create
damping effect.
15
Glazing Acoustical Performance
Laminated Glass
Sound Transmission Loss (db)
60
Damping
Performance
from Interlayer
50
STC 34
STC 32
40
30
20
Critical
Frequency Dip
10
3mm - 0.76mm
Saflex - 3mm
6mm mono
0
63
100
160
250
400
630
1000
1600
2500
4000
8000
One-third Octave Band Frequencies (Hz)
16
Glazing Acoustical Performance
Double Laminated Insulating Glass
60
Sound Transmission Loss (db)
STC 44
50
STC 42
40
30
20
6.76mm 25mm AS 6.76mm
10
6mm - 25mm
AS - 6mm
0
63
100
160
250
400
630
1000
1600
2500
4000
8000
One-third Octave Band Frequencies (Hz)
17
Acoustics PVB Technology
18
Acoustics PVB Technology
• PVB based
interlayer with
added damping
properties
compared to
regular PVB.
19
Acoustics PVB Technology
• 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.
20
Acoustics PVB Technology
Sound Transmission Loss (6mm)
Sound Transmission Loss (db)
60
STC 35
50
STC 34
40
STC 32
30
3mm - 0.76mm
Saflex QS - 3mm
20
3mm - 0.76mm
Saflex - 3mm
10
6mm mono
0
63
100
160
250
400
630
1000
1600
2500
4000
8000
One-third Octave Band Frequencies (Hz)
21
Automotive Adoptions
Mercury Milan
Mercedes S Class
Ford F150 Platinum
Ford Focus
Buick Enclave
Buick Lacrosse
Ford Taurus
22
Summary
• Sound is pressure wave in air.
• Human ear is sensitive to sound in range of 5008000Hz & 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.
23
Thank You
www.saflex.com
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