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Industrial Laminate Specifications
Glass-Based Phenolics
NEMA G-3, G-5, G-7, G-9, G-10, G-11 Grades

904 West 6th Street, Shiner, Texas 77984 USA
Phone: 1-361-594-2941     Fax: 1-361-594-2349     E-Mail: info@boedeker.com

1-800-444-3485

BPI Home Page | Applications | Materials Guide | Contact Us!
( see also Paper, Canvas & Linen-Based Phenolics Specifications )

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GENERAL DESCRIPTION
Phenolic Laminates are made by applying heat and pressure to layers of paper, canvas, linen or glass cloth impregnated with synthetic thermosetting resins. When heat and pressure are applied to the layers, a chemical reaction (polymerization) transforms the separate layers into a single laminated material with a "set" shape that cannot be softened again -- therefore, these materials are called "Thermosets". A variety of resin types and cloth materials can be used to manufacture thermoset laminates with a range of mechanical, thermal, and electrical properties.

GENERAL PROPERTIES
Physical strength, resiliency, ease and versatility of fabrication, and excellent electrical properties make Phenolic Laminates useful as support components in a wide range of mechanical and electrical applications. Phenolic Laminates are strong, stiff, and have high impact and compressive strengths. And, they do not soften upon re-heating, so they are easy to saw, drill, tap, and machine with ordinary tools. "FR" grades are flame retardant.

Glass-based grades have the highest dimensional stability and mechanical strength, as well as low moisture absorption. However, they are not as easily machined as paper or cotton fabric laminates.

GLASS-BASED PHENOLIC GRADES

G3 Phenolic G-3 (Glass Cloth / Phenolic Resin)
This material is made from woven glass cloth and high-temperature phenolic resin. It has excellent flexural, compressive and impact strengths and is capable of continuous operation over 350°F (175°C). NOTE: G-3 is not a common material ... call for more information about availability.

G5/G9 Phenolic G-5 and G-9 (Glass Cloth / Melamine Resin)
These materials are very hard, flame resistant, and have excellent electrical properties. G-5 and G-9 have high arc and heat resistance. G-9 is recommended for humid environments. They are used for switch board panels, arc barriers, circuit breaker parts, and structural electrical parts Melamine phenolics are available in sheet, rod, and tube forms.

G7 Phenolic G-7 (Glass Cloth / Silicon Resin)
This glass-silicon laminate has good electrical properties under humid conditions, excellent heat and arc resistance, and is self-extinguishing. G-7 is used for electrical grade insulation, and for heating & appliance insulation.

G10/G11 Phenolic G-10 and G-11 (Glass Cloth / Epoxy Resin)
These glass-epoxy laminates are specified for their extremely high strength and high dimensional stability over temperature. G-10 and G-11 are used for terminal boards, high humidity applications, electrical and electronic test equipment and electric rotor insulation. G-10 and G-11 are difficult to cut or machine and may require special equipment. G-10 is slightly stronger while G-11 is a better insulator and can take higher temperatures. FR-4 is a fire-retardant G-10 glass-epoxy laminate that is used primarily in the printed circuit board industry.

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TYPICAL PROPERTIES of GLASS LAMINATES (SHEET FORM)
( mechanical properties of rod and tube forms may differ )

ASTM or UL test Property G-3 G-5/G-9 G-7 G-10 G-11
PHYSICAL
D792 Density (lb/in³)
(g/cm³)
0.065
1.80
0.067
1.85
0.065
1.80
0.065
1.80
0.065
1.80
D570 Water Absorption, 24 hrs (%) 2.65 0.60 0.10 0.10 0.20
MECHANICAL
D638 Tensile Strength (psi)
-lengthwise
-crosswise

42,000
34,000

61,600
51,100

20,000
-

45,000
38,000

43,000
37,000
D790 Flexural Strength (psi)
-lengthwise
-crosswise

40,500
34,000

61,600
51,100

30,000
-

75,000
65,000

80,000
70,000
D790 Flexural Modulus (Kpsi)
-lengthwise
-crosswise

1,800
1,400

2,000
1,700

1,600
-

2,700
2,400

3,000
2,700
D256 IZOD Notched Impact (ft-lb/in)
-lengthwise
-crosswise

12.0
11.0

12.5
8.5

13.0
-

14.0
12.0

12.0
9.0
D695 Compressive Strength (psi) 55,000 65,000 50,000 65,000 63,000
D785 Hardness, Rockwell M M110 M115 M105 M110 M112
THERMAL
D696 Coefficient of Linear Thermal Expansion
(x 10-5 in./in./°F)
-lengthwise
-crosswise
0.83
1.00
0.83
1.00
0.72
0.90
0.55
0.66
0.72
0.83
- Max Operating Temp (°F / °C) 340 / 170 285 / 140 430 / 220 284 / 140 329 / 165
C177 Thermal Conductivity
(BTU-in/ft²-hr-°F)
(x 10-4 cal/cm-sec-°C)

2.0
7.0

2.0
7.0

2.0
7.0

2.0
7.0

2.0
7.0
UL94 Flammability Rating H-B V-0 H-B H-B H-B
ELECTRICAL
D149 Dielectric Strength (V/mil) short time, 1/8" thick 460 300 350 800 900
D150 Dielectric Constant at 1 MHz 7.3 6.3 4.5 5.0 4.5
D150 Dissipation Factor at 1 MHz 0.023 0.019 0.018 0.019 0.020
D495 Arc Resistance (sec) 180 180 240 100 120
NOTE: The information contained herein are typical values intended for reference and comparison purposes only. They should NOT be used as a basis for design specifications or quality control. Contact us for manufacturers' complete material property datasheets.
All values at 73°F (23°C) unless otherwise noted.

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Boedeker Plastics, Inc.
904 West 6th Street, Shiner, Texas 77984 USA
USA TOLLFREE : 1-800-444-3485
Phone: 1-361-594-2941     Fax: 1-361-594-2349     E-Mail: info@boedeker.com

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