FR-4 lambar daraja ce ta kayan da ba ta da wuta, wanda ke nufin ƙayyadaddun kayan da kayan guduro dole ne su iya kashe su da kansu bayan sun ƙone.Ba sunan abu bane, amma darajar kayan abu.Saboda haka, janar PCB kewaye allon, Akwai da yawa iri FR-4 sa kayan amfani, amma mafi yawansu su ne composite kayan sanya na Tera-Function epoxy guduro tare da filler da gilashin fiber.

FR-4 epoxy gilashin zane laminate, bisa ga daban-daban masu amfani, da masana'antu ne kullum ake kira: FR-4 Epoxy Glass rufi jirgin, epoxy jirgin, brominated epoxy jirgin, FR-4, Glass fiberboard, FR-4 ƙarfafa jirgin, FPC karfafa jirgin. , M kewaye hukumar ƙarfafa jirgin, FR-4 epoxy jirgin, harshen wuta-retardant rufi jirgin, FR-4 laminated jirgin, FR-4 gilashin fiberboard, epoxy gilashin zane jirgin, epoxy gilashin zane laminated jirgin, kewaye hukumar hakowa kushin.

Sunan FR4 ya fito ne daga tsarin NEMA inda 'FR' ke nufin 'mai kare wuta', wanda ya dace da mizanin UL94V-0.Zaɓin FR4 yana biye da TG130.TG yana nufin yanayin zafin gilashin canji - yanayin zafin da abin da aka ƙarfafa gilashin zai fara lalacewa da laushi.Ga daidaitattun allunan Fusion wannan ƙimar ita ce 130°C, wanda ya fi isa ga yawancin aikace-aikace.Musamman High TG kayan iya jure yanayin zafi na 170 - 180 ° C, kamar mu abubuwa 3250. The FR-5,G11 iya jure yanayin zafi na 155 ° C.

Yawancin laminates na FR4 suna da juriya na harshen wuta ga abun ciki na bromine, halogen mara amsawa wanda aka saba amfani dashi a masana'antu don kaddarorin sa na kashe wuta.Wannan yana ba da kayan FR4 fa'idodi masu fa'ida a matsayin kayan haja na PCB dangane da amincin wuta yayin cikin filin.Hakanan yana da ɗan kwantar da hankali idan ƙwarewar sayar da ku ba ta kai daidai ba.

Duk da haka, bromine halogen ne wanda ke da guba mai guba wanda aka saki a cikin yanayi lokacin da aka ƙone kayan.Ko da ƙananan kuɗi sun isa su yi mummunan lahani ga mutane ko ma mutuwa.Don rage amfani da irin waɗannan abubuwa masu haɗari a cikin samfuranmu na yau da kullun, ana samun laminates marasa halogen FR4.

Kwanan nan mun haɓaka farar fata da baƙar fata halogen-free FR4 epoxy glassfiber laminate zanen gado, yanzu ana amfani da shi azaman allon ƙarfafa FPC a cikin iphone, zanen gado, da sauransu.