SHIELDS Premier Windscreens, Shields, and Canopies Formed and SUPERCOATED Polycarbonate 
   
 

   TECHNICAL DATA

Technical Data for SHIELDS® SUPERCOATED™ Windshield Material

  Criteria Technical data Value / Result
1   A) % Light transmission
     (clear material)		 ASTM D 1003 88-89%
B) Anti-glare NA NA
2 A) Impact strength at -30°F Available only at 0°F  
● Notched izod ASTM D 256 18 ft-lbs. / IN
● Dynatup/dropping dart 5lb. Ball dropped
40 Feet		 >200 ft-lbs.
B) Impact strength at +70°F Available only at 32°F  
● Notched izod ASTM D 256 18 ft-lbs. / IN
Dynatup/dropping dart 5lb. Ball dropped
40 Feet		 >200 ft-lbs.
C) Impact strength at +160°F Available only at 73°F  
● Notched izod ASTM D 256 18 ft-lbs. / IN
● Dynatup/dropping dart 5lb. Ball dropped
40 Feet		 >200 ft-lbs.
3 A) Tensile strength ASTM D 638 9,500 psi
B) % Elongation to break ASTM D 638 –
Modulus of Elasticity 		110% +
340,000 psi
4 Resistance to    
a) UV UV Light Transmission Essentially opaque at all wavelengths below 385 nanometers
QUV-G53 Accelerated Weathering equiv. to approx. 10 years outdoor exposure <5.0 index at 10 Years
b) Scratch/abrasion ASTM D 1004 Z26.1 < 2% Haze
5 ESCR to    
a) Diesel   PASS
b) Windshield washing fluid   PASS
c) Soap & other cleaning agents   PASS
d) Brake fluid   PASS
e) Sea/salt water   PASS
f) Lubricants/mineral oil   PASS
6 Weight £ 0.9 than glass Polycarbonate is 50-54% lighter than glass When compared to like thickness
7 Flexural strength ASTM D 790 13,500 psi        
8 Expected life   10+ years*
9 Ease of molding/fabrication Fabrication – fairly easy Molding – cannot be molded after being formed & coated by manufacturer (FORM/TEC Plastics)
10 Ease of repair/replacement Replacement – easy Repair – Limited

*must have proper care

POLYCARBONATE - Sheet Typical Property Values

 

Property

Test Method

Units

Value
PHYSICAL

Specific Gravity

ASTM D792

—

1.20

Refractive Index @77°F

ASTM D542A

—

1.586

Light Transmission (Average), 1/8” disk

ASTM D1003

%

88

Rockwell Hardness

ASTM D785

—

M70

Water Absorption, Equilibrium, 24 hours
                @73°F
                @212°F

ASTM D570

%

.15
.35
.58
MECHANICAL

Tensile Strength
                @ Yield   
                Ultimate

ASTM D638

psi

 
9,000
9,500

Tensile Modulus

ASTM D638

psi

345,000

Flexural Strength

ASTM D790

psi

13,500

Flexural Modulus

ASTM D790

psi

345,000

Flexural Endurance @ 1,800 cycles/min,
73°F, 50% RH

ASTM D671

psi

1,000

Compressive Strength

ASTM D695

psi

12,500

Compressive Modulus

ASTM D695

psi

345,000

Elongation

ASTM D638

%

110

Poisson’s Ratio

—

—

.37

Izod Impact Strength              
                Notched @ 1/8”      
                Unnotched @ 1/8”

ASTM D256A

ft-lbs/in

 
12—16
60 (no failure)

Tensile Impact Strength, S-Type Specimen

ASTM 1822

ft-lbs/in²

225—300

Shear Strength         
                @ Yield   
                Ultimate

ASTM D732

psi

 
6,000
10,000

Shear Modulus

ASTM D732

psi

114,000

Deformation Under Load @ 4,000 psi
                @ 73°F
                @ 158°F

ASTM D621

%

 
.2
.3
THERMAL

Coefficient of Thermal Expansion

ASTM D696

in/in/°F

3.75 x 10-5

Coefficient of Thermal Conductivity

ASTM C177

Btu.in/hr.ft².°F

1.35

Specific Heat @40°C

 

cal/gm/°C

.30

Heat Deflection Temperature 
                @264 psi
                @  66 psi

ASTM D648

°F

 
270
280

Brittle Temperature

ASTM D746

°F

-211
FLAMMABILITY      
Horizontal Burn (Flame Spread) AEB ASTM D635 in <1