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は、米国電気製造業者協会によって規定された材料規格です。対応するIEC規格はEPGC202です。それに対応する国内基準はありません。

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.さまざまな形。さまざまな樹脂、硬化剤、および改質剤システムは、フォームのさまざまな用途の要件にほぼ適応でき、範囲は非常に低い粘度から高融点の固体までさまざまです。

2.便利な硬化。さまざまな硬化剤を選択してください。エポキシ樹脂システムは、0〜180℃の温度範囲でほぼ硬化できます。

3.強い付着力。エポキシ樹脂の分子鎖に固有の極性ヒドロキシル基とエーテル結合により、さまざまな物質への接着性が高くなっています。エポキシ樹脂の硬化時の収縮が少なく、発生する内部応力が小さいため、接着強度の向上にも役立ちます。

4.低収縮。エポキシ樹脂と使用する硬化剤との反応は、樹脂分子中のエポキシ基の直接付加反応または開環重合反応により行われ、水などの揮発性副生成物は放出されません。不飽和ポリエステル樹脂やフェノール樹脂と比較して、硬化時の収縮率は非常に低くなります（2％未満）。

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