Polyply Composites Inc.
(616) 842-6330

 

 

 

Gpo-3 gpo3 Sheet Laminate compression molded

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

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General Information
Unit
ASTM/UL TEST NO.
Typical Average
Values

NEMA Grade

GPO-2

GPO-3

n/a

Polyply Grade
L-40
L-50
L-50HT
Color
Red
Red
NC
U.L. Recognized File Number
E82624
E82624
E82624
Mechanical Properties
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
Specific Gravity
D792
1.8
1.8
1.75
Electric Properties
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
Dielectric Constant @ M Hz
D150
4.5
4.7
4.44
Dissipation Factor @ 60 Hz
D150
.014
.013
.054
Dissipation Factor @ M Hz
D150
.012
.011
.065
Comparative Tracking Index
volts
D3638
500+
500+
600+
Flame Resistance Properties
U.L. Subject 94
UL94
VO
VO
HB
Thermal Properties
Coefficient of Thermal Expansion
in/in/C x 10-5
D696
2.0
2.0
Thermal Conductivity
btu/hr/ft2/in/ºF
C177
1.8
1.9
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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