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As the premier polymer science company, DuPont is uniquely able to offer a range of glass laminating products that meet rapidly growing demands and new standards for improvements in glass security and safety with durable aesthetics. DuPont offers the products, the knowledge and final systems value for the entire glass industry to meet these needs effectively and profitably. 1. Butacite® polyvinyl butyral interlayer (PVB) has been continuously improved over the past 67 years from
its inception as the preferred material for safety glass. It has established all of the advantages of laminated glass: Safety and security, sound dampening; ability to offer solar control for energy savings; protection of interiors from fading; and added beauty.
2. SentryGlas®Plus interlayer (SGP) for laminated safety glazing is the latest innovation in DuPont’s family
of glass laminating products. It extends the performance of laminated glass beyond current technologies. SentryGlas® Plus Interlayer offers five times the tear strength and 100 times the rigidity of conventional PVB interlayer. Because of its added strength, clarity, durability, fabrication and installation ease, it is an excellent candidate for demanding applications in the architectural market place. It can offer improved ballistic protection or thinner constructions than are now possible with conventional laminated glass.
• SentryGlas
® Plus Is Designed for Today’s Architectural Needs.
–Same Safe Breakage and Fragment Retention. –Enhanced Impact Performance; Greater Security from Range of Threats; e.g. Severe Weather and Man-Made Threats, –No Head Impact Criterion, Greater Retention: Can Use Stiffer, Tougher Interlayers. –More Demanding Strength/Deflection Performance Both Pre & Post Glass Breakage; Overhead Glazing. –Greater Durability/Lifetime Demands at Elevated Temperatures. –Excellent Weather and Edge Stability. Engineering Strain, e
0 1 2 3 4 5
Engi
neer
ing
Stre
ss, σ
a (M
Pa)
0
10
20
30
40
PVB LaminateIonoplast (SentryGlas(R) Plus) Laminate
Strain Rate ~ 0.1/s
-10 0 10 20 30 40 50 60
Temperature oC
100
101
102
103
Sto
rage
You
ng's
Mod
ulus
(M
Pa)
1 Hz
sgplus_1Hz.axg
SentryGlas(R) PlusButacite(R)
Figure 1. SentryGlas® Plus vs. PVB for Laminated Glass SentryGlas® Plus is elasto-plastic, high tear energy (5 x PVB). Glass transition temperature ~ 55°C. (Stiffness 30 – 100 x PVB).
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Figure 2. Strength Attributes • SentryGlas® Plus laminates stronger than PVB laminates. • SentryGlas® Plus laminate shows near equivalence to monolith glass of same total thickness.
Pure Bending
Nominal Laminate Thickness (mm)
0 5 10 15 20 25 30 35 40
Pure Bending
Nominal Laminate Thickness (mm)
0 5 10 15 20 25 30 35 40
Def
lect
ion
Rel
ativ
e to
PV
B
0.0
0.5
1.0
1.5
2.0
EVASafe(TM)
PVB Reference SentryGlas(R) Plus
T = 23oC1.52 mm Interlayer
Laminate Dimension = 2m
0.4
0.6
0.8
1.0
1.2
1.4
1.6
SentryGlas(R) PlusPVB ReferenceEVASafe(TM)
T = 23oC1.52 mm Interlayer
Laminate Dimension = 2mnate
Stre
ngth
Rel
ativ
e to
PV
B L
ami
Figure 4. Relative Deflection
SentryGlas® Plus laminates show improved stiffness properties over other interlayers.
Good opportunities to reduce glass thickness.
Property and design information available from DuPont.
Figure 3. Relative Strength SentryGlas® Plus laminates show
improved strength properties over other interlayers. • Good opportunities to reduce glass thickness, particularly for thicker laminates.
Especially beneficial for point-supported glass.
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Reflected Impulse, Ir (kPa.ms)
10 100 1000 10000
Ref
lect
ed P
ress
ure,
P
r (kP
a)
1
10
100
1000
Reflected Impulse, Ir (psi.ms)
10 100 1000
Ref
lect
ed P
ress
ure,
Pr (
psi)
1
10
100Glass First Crack
PVB Laminate Tear
GSA: C GSA: D
7.5 mm PVB Laminate1.25 m x 1.55 m
Ionoplast Laminate: Minimal HazardIonoplast Laminate, Enhanced Attachment
Figure6• Weathering Behavior Extensive weathering tests Natural, Florida Exposure (> 7 yrs);
Enhanced, EMMA Arizona; Simulated, Xenon ASTM.
SGP exhibits none of the edge defects that sometime develop in traditional PVB laminates.
No change in color or haze.
Figure 5. Blast Test Performance 37.8 psi (261 kPa) - 258 psi.ms (1,779
kPa.ms). Solves DOS needs for Embassy program. Provides cost-effective solution versus glass-
clad polycarbonates.
Figure 8. Aesthe SOAC Proje SGP with su
Figure 7. SentryGlas® Secure™ --Patent
SentryGlas® Plus adheres well to metals, such as Al.
Enhanced post-glass breakage performance.
Design flexibility and aesthetics. Interlayer becomes primary structural
component in system.
tics and Light Control
ct per write glass
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5mm HS / 2.29 mm Interlayer / 5 mm HS0.75 m x 1.2 m Plate
5 kg steel ball dropped from 3 m
Time, (Seconds)
0 200 400 600 800 1000 1200 1400 1600 1800
Cen
ter D
ispl
acem
ent,
(mm
)
0
50
100
150
200
250
300
SGP-LamiPVB-Lami
Load ramped to 330 kg.
Figure 9. Creep Loading: Post-Glass Breakage
Polymer tear energy is a major variable in determining impact performance. Impact performance is inversely proportional to adhesion. Polymer debonding a necessary precursor to polymer stretching and energy dissipation (analogous to
CMCs). Post glass breakage performance as determined by in plane displacement of fragmented laminate
affected strongly by polymer modulus. Improved stiffness and tear energy gives superior performance
Table 1. Performance data
Material Performance SGP PVB Standard
Density (g/cm3) 0.95 1.07~1.08 ASTM D-792Coefficient of linear expansion ( °C –1)
10~15x10-5 (-20°C ~32 °C) 4x10-4 ASTM D-696
Tensile strength (Mpa) 34.5 20 ASTM D-638Tear strength (Tear energy) (MJ/m3 ) 50 10-15 ASTM D-638CSS (Mpa) >20.7 Du Pont Elongation (%) 400 275 (ASTM D-412) ASTM D-638HDT @ 66 PSI 43°C ASTM D-696Haze <2% <2 YID % <2.5 10-15 (interlayer) Refractive index 1.5 1.47~1.5 UV cutoff wavelength (nm) 310 380 UV screening ( %) 3C+0.38+3C 99.98 99.98
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