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FR4 PCB Manufacturer – One-stop service

KINGFORD commonly used two-panel materials are FR4 and CEM3, they both panel is flame-retardant and environmental protection plate, most of the legal company on market all use such materials to make PCB, please kindly check FR-4 specification as follow:

Epoxy fiberglass cloth substrate, the most widely used model number is FR-4. Due to the development of electronic product installation technology and PCB technology, high Tg FR-4 products have appeared.

FR-4 epoxy fiberglass cloth substrate is a kind of substrate with epoxy resin as binder and electronic grade glass fiber cloth as reinforcing material. It’s bonding sheet and inner core thin copper-clad plate are important substrates for making multilayer printed circuit boards. The epoxy fiberglass cloth substrate has higher mechanical properties, dimensional stability, impact resistance and moisture resistance than paper substrates, it has excellent electrical performance, high operating temperature, and its performance is less affected by the environment.

In terms of processing technology, FR-4 has great advantages over other fiberglass fiber substrates. These products are mainly used for double-sided PCBs and are used in large quantities.


FR4 PCB Performance Feature

Bending strength A to the vertical layer | Normality E-1/150,150±5℃≥340Mpa
Parallel layer impact strength (simply supported beam method) ≥230KJ/m
Insulation resistance after immersion(D-24/23) ≥5.0×108Ω
Vertical laminar electrical strength (in the oil of transformer 90±2℃, PCB thickness 1mm)≥14.2MV/m
Parallel layer breakdown voltage (in the oil of transformer 90±2℃)≥40KV
Relative dielectric constant (50Hz) ≤5.5
Relative dielectric constant (1MHz) ≤5.5
Dielectric loss factor (50Hz) ≤0.04
Dielectric loss factor (1MHz) ≤0.04
Hydroscopicity(D-24/23,PCB thickness 1.6mm) ≤19mg
PCB processing of Clamp melting point 203℃
Low loss coefficientDf 0.0025
Stable and low permittivityDk 2.35

Electrical machinery and electrical equipment for insulation structure parts, include all manner of switch FPC reinforce, Electrical insulation carbon film PCB, Cushion dies fixture for computer drilling etc (PCB Test frame), it is used in a humid environment and transformer oil.