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FABRIC BASE GRADES

SHEETS
PROPERTIES AND
CHARACTERISTICS
Resin
C
CE
Phenolic
CB
Phenolic
C-M
Melamine
C-YB
Phenolic
Graph-
itized
L
LE
LB
Phenolic
L-M
Melamine
L-YB
Phenolic
Graph-
itized
Tensile Strength, psi
Lengthwise
Crosswise
 
11,200
9,500
 
12,000
9,000
 
12,000
9,000
 
10,000
7,000
 
11,000
8,000
 
14,000
10,000
 
13,500
9,500
 
13,500
9,500
 
12,000
8,000
 
13,000
9,000
Compressive Strength, psi
Flatwise
Edgewise
 
37,000
23,500
 
39,000
24,500
 
39,000
24,500
 
38,000
24,000
 
38,000
24,000
 
35,000
23,500
 
37,000
25,000
 
37,000
25,000
 
37,000
25,000
 
35,000
23,500
‡Flexural Strength, psi (1/8" Thk.)
Lengthwise
Crosswise
 
17,000
16,000
 
17,000
14,000
 
17,000
14,000
 
16,000
13,000
 
17,000
14,000
 
15,000
14,000
 
15,000
13,500
 
15,000
13,500
 
15,000
13,500
 
15,000
13,500
Modulus of Elasticity in Flexure, psi
Lengthwise
Crosswise
 
1,000,000
900,000
 
900,000
800,000
 
900,000
800,000
 
900,000
800,000
 
900,000
800,000
 
1,100,000
850,000
 
1,000,000
850,000
 
1,000,000
850,000
 
1,200,000
900,000
 
900,000
800,000
Shear Strength, psi
12,000
11,000
11,000
13,000
11,000
12,000
11,500
11,500
11,000
11,000
‡Izod Impact, ft. lbs per inch of notch
Flatwise
Edgewise
 
3.20
1.90
 
2.30
1.40
 
2.30
1.40
 
0.55
0.50
 
2.30
1.40
 
2.50
1.10
 
1.80
1.00
 
1.80
1.00
 
0.80
0.60
 
2.50
1.00
‡Bond Strength, lbs.
1800
1800
1800
1600
1600
1600
1600
1600
1500
1500
                     
Dielectric Strength, VPM
Perpendicular to laminations
Short Time Test
1/16"
1/8"
200
150
500
360
500
360
300
200
-
-
200
150
500
360
500
360
300
200
-
-
‡Dissipation Factor, 1 megacycle
Condition A
0.100
0.055
0.055
0.050
-
0.100
0.055
0.055
0.050
-
‡Dielectric Constant, 1 megacycle
Condition A
7.00
5.50
5.50
6.50
-
7.00
5.80
5.80
7.00
-
Insulation Resistance, megohms
Condition: 96 hrs., 90% relative humidity, 95°F
-
-
-
-
-
-
30
30
120
-
‡Arc Resistance, seconds
-
-
-
100
-
-
-
-
100
-
‡Water Absorption, %24 hrs.
1/16"
1/8"
1/2"
4.40
2.50
1.20
2.20
1.60
0.75
2.00
1.50
0.65
3.50
2.50
0.90
3.30
2.00
1.00
2.50
1.60
0.90
1.95
1.30
0.90
1.50
1.20
0.65
2.40
1.20
0.70
2.70
2.00
1.00
                     
Thermal Conductivity,
Calories/Sec./cm2/°C/cm
7 X 10-4
7 X 10-4
-
-
7 X 10-4
7 X 10-4
7 X 10-4
-
-
-
Rockwell Hardness, M Scale
103
105
105
110
100
105
105
105
115
100
Specific Gravity
1.36
1.33
1.33
1.4
1.36
1.35
1.33
1.33
1.45
1.35
Coeff. of Ther. Expansion, Cm/Cm°C
2 X 10-5
2 X 10-5
2 X 10-5
2 X 10-5
2 X 10-5
2 X 10-5
2 X 10-5
2 X 10-5
2 X 10-5
2 X 10-5
Maximum Constant Operating
Temperature, °F
225
250
250
275
225
225
250
250
275
225
Thickness
Minimum
Maximum
.031"
10"
.031"
2"
.031"
2"
.031"
2 1/2"
2 1/2"
2"
.006"
2"
.015"
2"
.015"
2"
.015"
2"
.015"
2"
Standard Colors
Natural
(variable
tan) and
Black
Natural
(variable
tan) and
Black
Natural
(variable
tan)
Natural
(white
to gray)
Gray-
Black
Natural
(variable
tan) and
Black
Natural
(variable
tan) and
Black
Natural
(variable
tan)
Natural
(white
to gray)
Gray-
Black
Standard Finishes
Semi
Gloss
Semi
Gloss
Semi
Gloss
Semi
Gloss
Semi
Gloss
Semi
Gloss
Semi
Gloss
Semi
Gloss
Semi
Gloss
Semi
Gloss
Note: Data listed above are NEMA (National Electrical Manufacturers Association) values for those grades and properties established by NEMA.   ‡Guaranteed maximum or minimum values as the case may be. Other values shown are typical values derived from a number of tests and are included for design information only.

 

   
 
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