FR-4, wuri ne da aka yarda da shi na kasa da kasa don ƙimar ƙarfin fiberglass ɗin da aka ƙarfafa epoxy laminated wanda ke riƙe da harshen wuta (mai kashe kansa). Bayan ƙara wani Layer na jan karfe a daya ko kowane gefe na fr4 jirgi, ya zama Copper Clad Laminate (CCL), kuma wannan shine ainihin kayan da ba ya aiki don allon da'ira da aka saba bugawa (PCB). Za a sanya sunan allon da'ira da aka buga ta amfani da FR4 azaman ainihin kayan aiki"Farashin FR4 PCB".
Ana amfani da allon fr4 PCB don tallafawa da injina da haɗa kayan aikin lantarki ta hanyar lantarki ta amfani da hanyoyin gudanarwa, waƙa, ko alamun sigina da aka zana daga ma'aunin laminate mai sanye da tagulla. Wani lokaci, ana kuma kiran PCB Printed Wiring Board (PWB) ko etching wiring board idan ba a ƙara ƙarin kayan lantarki a ciki ba.
Mafi kyawun fasaha yana ba da mafi kyawun jerin kwamitocin FR4 wanda yake akwai a cikin nau'ikan nau'ikan nau'ikan da bayanai. Mafi kyawun Fasahafr4 masana'anta a hankali yana zaɓar kayan albarkatun ƙasa masu inganci. Wannan yana ba mu damar samar da hukumar fr4 wanda ya fi sauran samfuran da ke cikin masana'antar. Yana da fa'idodi a cikin aikin ciki, farashi, da inganci.
Mafi kyawun jerin samfuran fasaha sun ƙunshi ƙananan samfura da yawa. Mufr4 pcb masana'anta yana mai da hankali sosai ga mutunci da martabar kasuwanci. Muna tsananin sarrafa inganci da farashin samarwa na samarwa. Duk waɗannan suna ba da garantin cewa hukumar fr4 tana da inganci da dogaro da farashi.