FR4環氧玻璃纖維板中FR4的含義

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 是美國電氣製造商協會制定的材料標準。對應的IEC標準是EPGC202。國內尚無與之對應的標準。

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、形式多樣。各種樹脂、固化劑和改性劑體係幾乎可以適應各種應用對形式的要求，範圍可以從極低粘度到高熔點固體。

2、固化方便。選擇多種不同的固化劑，環氧樹脂體係幾乎可以在0～180℃的溫度範圍內固化。

3.附著力強。環氧樹脂分子鏈中固有的極性羥基和醚鍵，使其對各種物質具有很強的粘附性。環氧樹脂固化時收縮率低，產生的內應力小，也有助於提高粘接強度。

4、收縮率低。環氧樹脂與所用固化劑的反應是通過樹脂分子中環氧基的直接加成反應或開環聚合反應進行的，不釋放水或其他揮發性副產物。與不飽和聚酯樹脂和酚醛樹脂相比，它們在固化過程中表現出非常低的收縮率（小於 2%）。