(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.
"FR4." YourDictionary, n.d. Web. 15 January 2019. <https://www.yourdictionary.com/fr4>.
FR4. (n.d.). Retrieved January 15th, 2019, from https://www.yourdictionary.com/fr4
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