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FR4

CNC Machining

Overview

FR4 is a composite material made of woven fiberglass cloth with an epoxy resin binder. It is flame retardant and widely used as a substrate for printed circuit boards.

Mechanical Properties

Tensile Strength310 MPa
Flexural Strength415 MPa

Physical Properties

Density1,850 kg/m³
Thermal Conductivity0.3 W/m·K

Applications

PCB substrates
Electrical insulation
Structural supports
Test fixtures

Advantages

  • Flame retardant
  • Excellent electrical insulation
  • Good mechanical strength
  • Dimensionally stable

Limitations

  • Abrasive to tools
  • Dust hazard when machining
  • Not transparent
  • Limited flexibility

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