FR5 is a fire-retardant glass epoxy material that provides superior thermal and electrical insulation. Aside from its fire retardant characteristics, FR5 is identical to G11 glass epoxy material. FR5 is a perfect thermoset for applications requiring excellent dimensional stability and mechanical strength with the ability to resist high temperatures while preventing the spread of fire or flames.

For these reasons, FR5 is generally a suitable substitute for projects that specify G11 material. However, manufacturers cannot substitute G11 for applications that require FR5, particularly if a fire retardant material is needed.

FR5 Material Properties and Composition

Glass epoxy materials contain a glass-fiber matrix and an epoxy resin. While FR5 and G11 share the same material properties, FR5 is also similar to FR4 material, with the ability to resist higher temperatures. FR5 offers a comprehensive range of material benefits, including superior chemical resistance, high tensile strength, low moisture absorption, and high impact strength.

The primary material properties of G11 and FR5 glass epoxy include the following:

  • Specific gravity: 1.82
  • Tensile strength: 63,000 pounds per square inch (psi)
  • Flexural strength – LW -A 0.125″: 75,000 psi
  • Shear strength: 22,000 psi
  • Bond strength: 2,200 psi
  • Hardness (Mohs Scale): 112
  • Flammability rating: 94HB
  • Maximum operating temperature: 180 degrees Celsius (356 degrees Fahrenheit)
  • Izod impact strength at 49 degrees Celsius -LW: 12.00
  • Water absorption over 24 hours: 0.20
  • Coefficient of thermal expansion in degrees Celsius (x10-5): 1.10

Types of FR5 Materials We Supply

Atlas Fibre is among North America’s top suppliers of thermoset composite laminates. We offer various forms of FR5 materials in stock, including:

  • Sheets: Various lengths, widths, and thicknesses.
  • Tubes: Numerous lengths, wall thicknesses, and diameters.
  • Rods: Many different lengths and diameters.

In addition, our customization abilities enable us to supply nearly any length, thickness, or diameter of glass epoxy material you need. Our experts can help you choose the perfect material fit that matches your application’s specifications.

FR5 Uses and Applications

Glass epoxy is one of the most practical and effective materials for electrical applications requiring high-performance insulation. Since FR5 is a thermoset, no melting will occur in high-temperature applications. Additionally, because of its fire-retardant properties, FR5 is highly popular among automakers.

Specific applications include the following:

  • Sealing and gasket components
  • Static electrical and induction system insulators
  • Heating elements
  • Rocket cases
  • Cryogenic insulation
  • Circuit board holders
  • Antenna insulators

Contact Atlas Fibre for More Information About FR5

If you want to learn more about FR5, G11, or any other thermoset materials we offer, the expert team at Atlas Fibre can assist you. We pride ourselves on our top-class customer service, helping each client select the most practical and cost-effective material solutions to meet the requirements of their unique applications. We also boast one of the industry’s largest selections of in-stock materials, enabling us to offer some of the industry’s shortest turnaround times.

Get in touch with us online or call 847-565-1996 to request pricing or to obtain additional product specifications.

*Atlas Fibre LLC provides this data as information only and does not imply any warranty for its use or application. Test results for a specific sheet or lot are available for a fee upon request.