The meaning of FR4 in FR4 epoxy glass fiber board

FR4 is a code for the grade of flame-retardant materials. It represents a material specification that the resin material must be able to extinguish by itself after burning. It is not a material name, but a material grade. Therefore, it is currently used in general circuit boards. There are many types of FR-4 grade materials, but most of them are composite materials made of so-called Tera-Function epoxy resin, Filler and glass fiber.

NEMA je standard materijala koji propisuje Američko udruženje proizvođača električnih proizvoda. Odgovarajući IEC standard je EPGC202. Ne postoji domaći standard koji mu odgovara.

The closest domestic standard is 3240 epoxy laminated glass cloth board. The corresponding IEC standard of 3240 is EPGC201, and there is only a difference in flame retardancy between EPGC201 and EPGC202. Therefore, it can be simply considered that FR-4 is an improved product of 3240 with enhanced flame retardancy.

FR4 epoxy glass fiber board, the main material is imported prepreg. The colors are white, yellow and green. It still has high mechanical strength at room temperature of 150℃. It has good electrical performance in dry and wet state, flame retardant, used in electrical and electronic Insulation structural parts in other industries are carefully manufactured with imported raw materials, domestic presses and standard technology; the main specifications are 1000*2000 mm 1020mm*1220mm, because of the advantages of raw materials, it guarantees high quality, low price, and timely delivery. It has a solid customer base at home and abroad and enjoys a high reputation.

Application characteristics sharing of FR4 epoxy glass fiber board

1. Različiti oblici. Razne smole, sredstva za stvrdnjavanje i sustavi modifikatora mogu se gotovo prilagoditi zahtjevima različitih primjena oblika, a raspon može biti od vrlo niske viskoznosti do krutih tvari s visokim talištem.

2. Prikladno stvrdnjavanje. Odaberite mnoštvo različitih sredstava za stvrdnjavanje, sustav epoksidnih smola može se gotovo očvrsnuti u temperaturnom rasponu od 0 ~ 180 ℃.

3. Snažno prianjanje. Inherentne polarne hidroksilne skupine i eterske veze u molekularnom lancu epoksidnih smola čine ga vrlo ljepljivim za različite tvari. Skupljanje epoksidne smole je nisko pri stvrdnjavanju, a unutarnji napon je mali, što također pomaže poboljšati čvrstoću prianjanja.

4. Nisko skupljanje. Reakcija između epoksidne smole i korištenog sredstva za stvrdnjavanje provodi se reakcijom izravnog dodavanja ili reakcijom polimerizacije otvaranja prstena epoksidnih skupina u molekuli smole, a voda i drugi hlapljivi nusprodukti se ne oslobađaju. U usporedbi s nezasićenim poliesterskim smolama i fenolnim smolama, tijekom stvrdnjavanja pokazuju vrlo nisko skupljanje (manje od 2%).

1. Mechanical properties. The cured epoxy resin system has excellent mechanical properties.