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| NEMA G9 is similar to
G5 but it can
be used in high humidity applications. It has high mechanical strength and
excellent electrical properties, including high arc and heat resistance.
It is also self extinguishing. It is used in the electrical industry in
switch board panels, arc barriers, circuit breakers, and as structural
electrical parts both under regular and high humidity situations.
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An electrical/mechanical grade of glass cloth laminate impregnated and cured with melamine resin. |
Sheet sizes 36 x 72, 36 x 48, 48 x 48, 48 x 96, and 48 x 108 in thicknesses .031 in. to 4 in.; cut and fabricated per drawing . |
Gray |
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Density |
124 lbs/ft3 - .072 lbs/in3 |
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Maximum operating temperature |
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electrical |
not recommended at elevated temperatures |
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mechanical |
284° F (140° C) |
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Water absorption |
0.2% |
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Hardness (Rockwell M) |
120 |
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Compressive strength |
65,000 psi |
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Tensile strength |
55,000 psi |
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Flexural strength |
75,000 psi |
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Impact strength - Izod edgewise with grain |
13.0 ft-lb/in |
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Dielectric strength |
450 vpm |
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Dielectric constant (@ 106 cycles per second) |
7.2 |
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Volume resistivity |
1.5x 107 megohm-cm |
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Arc resistance |
180 sec |
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Surface resistivity |
1.5 x 107 megohms |
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Parallel dielectric |
70 kv |
