Epoxy Fiberglass is an engineering composite made of epoxy resin reinforced with glass fiber, offering high mechanical strength, excellent electrical insulation, good thermal stability and low moisture absorption. This material is widely used in FR4 and G10 sheets, electrical insulation components, structural panels, CNC-machined parts and industrial boards. Due to its durability, dimensional stability and electrical performance, epoxy fiberglass is a reliable choice for electrical, electronic and industrial applications.
What is Epoxy Fiberglass?
Epoxy Fiberglass is a high-performance engineering composite consisting of woven glass fiber
reinforced with thermoset epoxy resin. This combination provides an excellent balance of
mechanical strength, electrical insulation, thermal stability and dimensional consistency.
Epoxy fiberglass materials are commonly supplied in industrial laminate grades such as
FR4 and G10 and are widely used across electrical, electronic, mechanical and industrial sectors.
Due to its low moisture absorption, high dielectric properties and good resistance to heat,
epoxy fiberglass is a preferred material for structural insulation, CNC-machined components
and load-bearing electrical applications where reliability and long service life are required.
Engineering Properties of Epoxy Fiberglass
- Excellent electrical insulation: High dielectric strength suitable for electrical and electronic equipment.
- High mechanical strength: Good resistance to tensile, compressive and impact loads.
- Thermal stability: Maintains performance under elevated operating temperatures.
- Low moisture absorption: Minimal water uptake, ensuring dimensional stability.
- Dimensional stability: Ideal for precision CNC machining and tight-tolerance parts.
- Chemical resistance: Resistant to many industrial chemicals and oils.
- Long service life: Designed for demanding industrial environments.
Industrial Applications of Epoxy Fiberglass
- FR4 and G10 laminated sheets
- Electrical insulation panels and switchgear components
- Printed circuit boards (PCB substrates)
- Precision CNC-machined components
- Spacers, bushings, brackets and structural parts
- Liners, plates and heat-resistant components
- Parts exposed to humidity and industrial chemicals
Typical Technical Properties of Epoxy Fiberglass
| Property | Typical Value |
|---|---|
| Density | 1.85 – 2.0 g/cm³ |
| Electrical insulation | Excellent |
| Tensile strength | 250 – 350 MPa |
| Continuous service temperature | Up to approx. 155°C (grade dependent) |
| Moisture absorption | < 0.2% |
| Compressive strength | 300 – 400 MPa |
FR4 and G10 Epoxy Fiberglass Grades
FR4 Grade
FR4 is a flame-retardant epoxy fiberglass laminate with excellent electrical insulation
and improved thermal resistance. Due to its self-extinguishing properties,
FR4 is the preferred choice for electrical panels, PCB substrates, insulation parts
and electrical equipment.
G10 Grade
G10 is a non-flame-retardant epoxy fiberglass grade offering
superior mechanical strength and dimensional stability.
It is commonly used for CNC-machined mechanical parts, structural components
and load-bearing applications.
Difference Between FR4 and G10
- FR4: Flame-retardant, optimized for electrical and electronic applications.
- G10: Higher mechanical performance, preferred for structural and CNC-machined components.
Frequently Asked Questions – Epoxy Fiberglass
Is epoxy fiberglass suitable for electrical panels?
Yes. Especially FR4 grade, which provides excellent electrical insulation
and flame-retardant properties for electrical systems.
Can epoxy fiberglass sheets be CNC machined?
Yes. Due to their dimensional stability and mechanical strength,
epoxy fiberglass laminates are well suited for CNC machining.
What is the main difference between FR4 and G10?
FR4 offers flame retardancy and is mainly used in electrical applications,
while G10 provides higher mechanical strength for structural and mechanical parts.
For selecting the most suitable epoxy fiberglass laminate for your application,
consult the technical team at Tosee Teflon.