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Electrical Grade Sheet Laminates |
All grades of Polyply industrial sheet are produced using polyester
resin and fiberglass reinforcement. They are U.L. recognized and are
available in 36"x72" and 48"x96" sheet. Sheets are manufactured in
thicknesses ranging from 1/32" to 2" with most sizes in stock for
immediate shipment.
Polyply L-40. Low cost, general purpose flame retardant electrical
laminate which meets or exceeds NEMA GPO-2 requirements.
Polyply L-50. Track resistant, flame retardant laminate which meets
or exceeds NEMA GPO-3 requirements.
Polyply L-50HT. Track resistant, High Temperature laminate.
TYPICAL PROPERTIES
General Information |
Unit |
ASTM/UL TEST NO. |
Typical Average Values |
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NEMA Grade |
GPO-2 |
GPO-3 |
n/a |
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Polyply Grade |
L-40 |
L-50 |
L-50HT |
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Color |
Red |
Red |
NC |
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U.L. Recognized File Number |
E82624 |
E82624 |
E82624 |
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Mechanical Properties |
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Tensile Strength |
psi |
D638 |
9,800 |
10,000 |
10,820 |
Flexural Strength |
psi |
D790 |
22,000 |
23,200 |
26,092 |
Compressive Strength |
psi |
D695 |
32,000 |
32,800 |
35,500 |
Flexural Modules |
psi x 106 |
D790 |
1.20 |
1.23 |
1.28 |
Shear Strength |
psi |
D732 |
14,000 |
14,000 |
11,000 |
Izod Impact Strength (notched) |
ft-lb/in |
D256 |
8.0 |
8.2 |
11.3 |
Water Absorption |
% by weight |
D570 |
0.23 |
0.21 |
0.28 |
Barcol hardness |
D2583 |
50 |
50 |
50 |
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Specific Gravity |
D792 |
1.8 |
1.8 |
1.75 |
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Electric Properties |
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Dielectric Strength (- in oil) |
volts/mil |
D149 |
415 |
400 |
420 |
Dielectric Strength (Parallel in oil) |
kV |
D149 |
61 |
57 |
52.1 |
High Voltage Arc Resistance |
sec |
D495 |
200+ |
200+ |
181 |
Dielectric Constant @ 60 Hz |
D150 |
4.6 |
4.8 |
6.34 |
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Dielectric Constant @ M Hz |
D150 |
4.5 |
4.7 |
4.44 |
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Dissipation Factor @ 60 Hz |
D150 |
.014 |
.013 |
.054 |
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Dissipation Factor @ M Hz |
D150 |
.012 |
.011 |
.065 |
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Comparative Tracking Index |
volts |
D3638 |
500+ |
500+ |
600+ |
Flame Resistance Properties |
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U.L. Subject 94 |
UL94 |
VO |
VO |
HB |
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Thermal Properties |
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Coefficient of Thermal Expansion |
in/in/C x 10-5 |
D696 |
2.0 |
2.0 |
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Thermal Conductivity |
btu/hr/ft2/in/ºF |
C177 |
1.8 |
1.9 |
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U.L. Temperature Index-Electrical |
ºC |
UL746B |
130 |
130 |
220 |
U.L. Temperature Index-Mechanical |
ºC |
UL746B |
160 |
140 |
210 |
All properties are based on 1/8" thick sheet.
Unless otherwise indicated, all properties published are based on
tests performed on standard ASTM test samples and according
to ASTM test methods. Values shown are for test samples made
from production materials and they are believed to be typical. No
warranty is expressed or implied.
Nominal |
Plus or Minus |
Nominal |
Plus or Minus |
Thickness, |
Tolerance |
Tolerance |
Tolerance |
Inches |
Inches |
Inches |
Inches |
1/32 |
0.0075 |
1/2 |
0.024 |
1/16 |
0.0075 |
5/8 |
0.027 |
3/32 |
0.0090 |
3/4 |
0.029 |
1/8 |
0.0100 |
1 |
0.033 |
3/16 |
0.0125 |
1-1/2 |
0.041 |
1/4 |
0.0150 |
2 |
0.049 |
3/8 |
0.0200 |
At least 90 percent of the area of the sheet shall be within the
tolerances given, and at no point shall the thickness vary from
the nominal by a value greater than 125 percent of this specified
tolerance.
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