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ENGINEERING COMPOSITE

G10 & FR-4 Machining

The standard for high-strength electrical insulation. We CNC machine G10 and FR-4 glass-epoxy laminates to create robust insulators, test fixtures, and structural components with precision.

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An industrial fixture for holding a PCB, a primary application for machined G10/FR-4

A High-Performance Thermoset Composite

G10 and FR-4 are high-pressure thermoset laminates made from woven fiberglass cloth impregnated with an epoxy resin binder. They are known for their unique combination of high strength, dimensional stability, and superior electrical insulating properties, even in humid conditions.

Excellent Electrical Insulation

They are exceptional insulators with high dielectric strength and low electrical loss factors, making them ideal for mounting and isolating electronic components.

High Mechanical Strength

The woven glass reinforcement gives these materials very high strength, stiffness, and impact resistance, far exceeding most standard plastics.

Great Dimensional Stability

With a very low coefficient of thermal expansion and near-zero moisture absorption, G10/FR-4 parts remain dimensionally stable through wide temperature and humidity swings.

Machining & Applications

G10 and FR-4 are primarily processed via CNC machining from stock sheets. The woven glass fibers are very abrasive and require specialized diamond-coated or carbide tooling. We have the expertise to machine these materials while controlling dust and preventing delamination.

  • PCB Test Fixtures: The primary application. Used to create robust, non-conductive fixtures for In-Circuit Testing (ICT).
  • Electrical Insulators: Terminal boards, bus bar insulators, and mounting plates in high-voltage equipment.
  • Structural Components: High-strength structural parts where electrical insulation is also a requirement.
A machined copper busbar, which would be mounted on an insulator made from G10/FR-4

G10/FR-4 FAQ

What is the difference between G10 and FR-4?

They are very similar. FR-4 is the flame-retardant grade of G10. It contains added bromine, which gives it a UL94 V-0 flammability rating. For any application in certified electronic equipment, FR-4 is the required choice. G10 is used for general mechanical applications where a flammability rating is not needed.

What do they look like?

G10 typically has a light green to yellowish color. FR-4 is also typically a yellowish-green. Both are semi-translucent, and you can often see the woven pattern of the fiberglass cloth within the material.