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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