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3240

H3240-A

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H3025-A

FR-4 Covered copperplate

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FR-4 paintless board


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Epoxy laminated glass cloth board（FR-4 paintless board） GB5129.5—85

1 ．Definite and purpose

　　 This product is formed through heat pressing after the electrical industry alklifreeglass fibre cloth dips into epoxy resins. Epoxy laminated glass cloth board (glass cloth board for short) . Characteristics: high mechanical strength when high temperature, dielectric performance under high temperature, flame resistance.

2 ．Technical requirement

　 Outside appearance：
　　 Surface is smooth, no bubble, wrinkle and crackle, free from other defects as possible, such as scrape, impact pit, uneven color, but a little color spot is allowed.

Table 1:Main performance index

Sr.	Item	Unit	Test method	Index value
1	density	G/cm³	GB/T5130 section 8.2	(1.70—1.90)
2	water absorption	Mg	GB/T5130 section 8.2	Refer to table 2
3	vertical layer direction bending strength	Mpa	GB/T5130 section 8.2	≥340
4	Vertical layer direction compress strength	Mpa	GB/T5130 section 8.2	≥（350）
5	Tensile strength	Mpa	GB/T5130 section 8.2	≥（300）
6	Compact strength（Simple strut-beam method）	KJ/M²	GB/T5130 section 8.2	≥37
7	insulation resistance after water dipping	Ω	GB/T5130 section 8.2	≥5.0×10⁸
8	Mediate loss factor，1MHz hour	----	GB/T5130 section 8.2	≤0.04
9	Dielectric factor，1MHz hour	----	GB/T5130 section 8.2	≤5.5
10	vertical layer direction electric strength at （90±2）℃ transformer oil	KV/mm	GB/T5130 section 8.2	Refer to table 3
11	Parallel layer direction breakdown voltage at （90±2）℃ transformer oil	KV	GB/T5130 section 8.2	≥35

Table 2：Water absorption and electric strength

Average thickness m	Water absorption mg	Average thickness mm	Water absorption mg	Average thickness mm	Water absorption mg
0.4	≤17	2.0	≤20	10.0	≤34
0.5	≤17	2.5	≤21	12.0	≤38
0.6	≤17	3.0	≤22	14.0	≤41
0.8	≤18	4.0	≤23	16.0	≤46
1.0	≤18	5.0	≤25	20.0	≤52
1.2	≤18	6.0	≤27	25.0	≤61
1.6	≤19	8.0	≤31	单面加工至22.5	≤73

Table 3：Electric strength：

Average thickness mm	Electric strength MV/mm	Average thickness mm	Electric strength MV/mm	Average thickness mm	Electric strength MV/mm
0.4	≥16.9	1.0	≥14.2	2.2	≥11.4
0.5	≥16.1	1.2	≥13.7	2.4	≥11.1
0.6	≥15.6	1.4	≥13.2	2.5	≥10.9
0.7	≥15.2	1.6	≥12.7	2.6	≥10.8
0.8	≥14.8	1.8	≥12.2	2.8	≥10.5
0.9	≥14.5	2.0	≥11.8	3.0	≥10.2

Note：The above product is in conformity to UL with yellow card certificate No. E117719. Additonal technical requirement or color should be negotiated by supplier and purchaser.