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20 mil RO4003C PCB
20 mil RO4003C PCB
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What is FR4 in PCB?

  • October 19. 2022

What is FR4 in PCB?


FR-4 is a code of a grade of flame-resistant materials, which means a material specification that a resin material must be able to extinguish by itself after burning. It is not a material name, but a material grade. Therefore, general PCB circuit boards, There are many types of FR-4 grade materials used, but most of them are composite materials made of Tera-Function epoxy resin with filler and glass fiber.


FR4 PCB Spacer


FR-4 glass epoxy is a popular and versatile high-pressure thermoset plastic laminate with good strength to weight ratios. With near zero water absorption, FR-4 is most commonly used as an electrical insulator possessing considerable mechanical strength. The FR4 materials also known to retain its high mechanical values and electrical insulating qualities in both dry and humid conditions. These attributes, along with good fabrication characteristics, lend utility to this grade for a wide variety of electrical and mechanical applications.

FR-4 epoxy glass cloth laminate, according to different users, the industry is generally called: FR-4 Epoxy Glass Cloth, insulation board, epoxy board, epoxy board, brominated epoxy board, FR-4, Glass fiberboard, glass fiberboard, FR-4 reinforced board, FPC reinforced board, flexible circuit board reinforced board, FR-4 epoxy board, flame-retardant insulation board, FR-4 laminated board, epoxy board, FR-4 light board, FR-4 glass fiberboard, epoxy glass cloth board, epoxy glass cloth laminated board, circuit board drilling pad.

Main technical features and applications: 

stable electrical insulation performance, good flatness, smooth surface, no pits, thickness tolerance standards, suitable for products with high-performance electronic insulation requirements, such as FPC reinforcement boards, PCB drilling pads, glass Fiber mesons, potentiometer carbon film printed glass fiberboards, precision planetary gears (wafer grinding), precision test plates, electrical (electrical) equipment insulation struts, insulation pads, transformer insulation boards, motor insulation parts, grinding gears Electronic switch insulation board.


Bicheng specialize in high frequency PCBs over 18 years with stable and strict quality gurantee, which based on following material, but not limit to.

Rogers RO4350B, RO4003C, RO3003, RO3006, RO3010, RO3210 etc.
Rogers RT/duroid 5880, RT/duroid 5870, RT/duroid 6002, RT/duroid 6010,
PTFE F4B DK2.2, DK2.65 etc..
Taconic TLX-8, TLY-5, RF-35TC, TLF-35 etc.
Arlon AD450, AD600 etc.

We service cellular base station antenna, satellite, high frequency passive components, microstrip line and band line circuit, millimeter wave equipment, radar system, digital radio frequency antenna and other fields wordwide. We are mainly providing high frequency PCBs which built on 3 high frequency material brands: Rogers Corporation, Taconic and Wangling. Dielectric constant ranges from 2.2 to 10.2 etc.


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