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FR4 |
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FR4(Flame Retardant 4) A widely used insulating material for making printed circuit boards. It is constructed of woven glass fibers (fiberglass) that are epoxied together. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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And once again, the dielectric constant comes into play: the dielectric constant of the current industry standard for circuit board epoxies, a composite known as FR4, can range from 3. Because of the high signaling speed and limitations of the common FR4 PCB routing material, trace lengths should typically be less than 6 inches. The uncertainties in the NIST measurement of ASRs are larger in the UV and near-IR (800 nm to 1200 nm) and hence the uncertainties when using FR1, FR4, and FR6 were larger than when using the other devices. |
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