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| NEMA FR4 has high flexural, impact, and bond strength at room temperatures. It retains good electrical properties under dry and humid conditions. It is used in the electrical industry and anywhere a high strength electrical insulator in humid or dry conditions is needed. NEMA FR4 is UL listed. |
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An electrical/mechanical grade of glass cloth laminate impregnated and cured with epoxy resin. |
Sheet sizes 36 x 48, 48 x 48, 48 x 96, and 48 x 108 in thicknesses .031 in. to 5 in.; cut and fabricated per drawing . |
Natural or Black |
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Density |
119 lbs/ft3 - .069 lbs/in3 |
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Maximum operating temperature |
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electrical |
266° F (130° C) |
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mechanical |
284° F (140° C) |
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Water absorption |
0.05% |
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Hardness (Rockwell M) |
109 |
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Compressive strength |
60,000 psi |
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Tensile strength |
50,000 psi |
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Flexural strength |
65,000 psi |
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Impact strength - Izod edgewise with grain |
12.0 ft-lb/in |
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Dielectric strength |
550 vpm |
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Dielectric constant (@ 106 cycles per second) |
5.0 |
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Volume resistivity |
6 x 106 megohm-cm |
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Arc resistance |
100 sec |
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Surface resistivity |
1 x 106 megohms |
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Parallel dielectric |
60 kv |
