FR4 is a fire rated electrical-grade, dielectric fiberglass laminate epoxy resin system combined with a glass fabric substrate.
The abbreviation "FR4" means: F (for flame) and R (for retardant).

FR4 grades material offer excellent chemical resistance, flame ratings (UL94-VO) and electrical properties under dry and humid conditions. FR4 also features high flexural, impact, superior mechanical strength and bond strength at temperatures up to 130°C.

No. Property Unit Requirment Test Result Test Method
1 Flexural strength A Direction MPa ≥340 593 IEC 60893-2:2003
B Direction ≥340 506
2 Modulus of elasticity in flexure A Direction MPa - 2.43 X 104
B Direction - 2.24 X 104
3 Compressive strength MPa - 598
4 Charpy impact strength(notched) A Direction kJ/m2 ≥33 75.7
B Direction ≥33 56.2
5 Shear strength parallel to laminations A Direction MPa - 64.7
B Direction - 67.8
6 Tensile strength A Direction MPa - 443
B Direction - 345
7 Dielectrical strength at 90ºC±2ºC in oil perpendicular to laminations (20s step-by-step test) kV/mm ≥11.8 15.4
8 Breakdown voltage at 90ºC±2ºC in oil perpendicular to laminations (20s step-by-step test) kV ≥35 100
9 Relative permitivity(50Hz) - - 4.77
10 Insulation resistance after immersion in water A Direction Ω ≥5.0 X 1010 1.9 X 1014
B Direction ≥5.0 X 1010 8.2 X 1013
11 Deflection temperature under flexual load(Tff 1.8) ºC - >240
12 Water absorption mg ≤25 8.8
13 Bonding strength N - 8741 IEC 60893-3-4:2003
Note: 1.In test item 3,the thickness of sample is 9.46~9.47mm.
2.In test item 7,the dimension of sample is 1.95mm~1.96mm,using Φ25mm/Φ75mm Circle Column electrode system.
3.In test item 8,the dimension of sample is 100.00mmx4.80mmx25.00mm,using Φ130mm/Φ130mm flat electrode system.
4.In test item 12,the dimension of sample is 50.10mmx50.10mmx5.00mm.
5.The indicator requirements are based on the EPGC306 type in IEC 60893-3-2:2003.

The FR4/G10 sheet is widely used high-end insulation parts processing, FPC (flexible printed circuit-board) reinforcement sheet, planetary wheel, transformer insulation baffle, high voltage switch, precision test fixture, carbon film printing, electronic insulation parts, various water sports equipment and blade-tool handle materials.

Our company was founded in 2012, located in Guangzhou city of China, and we specialize in producing G10/FR4 laminated sheet,colored G10 sheet,fiberglass rod,fiberglass tube,carbon fiber sheet,carbon fiber tube/rod,fiberglass processing products,carbon fiber processing products,thermoplastic fiberglass sheet,thermoplastic carbon fiber sheet,micarta sheet,acrylic sheet,POM sheet,POM rod,etc.We can develop and produce various insulation products according to customers' requirement.

1. Q: Are you factory?
A: Yes, We are factory.
2. Q: How about the delivery time?
A: Depends on the quantity of order,ususlly it's less than 10 work days.
3. Q: Can I get free sample for checking?
A: We can provide samples by free.
4. Q: Can you give me a discount price?
A: More quantity, more discount you can get.