Glass Melamine

Although G5 glass melamine was popular in the manufacturing sector decades ago, it has largely been replaced by G9 material for most industrial applications. While both compositions are nearly identical, the primary difference between G9 and G5 is that G9 has better resistance properties against environmental elements. For these reasons, manufacturers can safely substitute G9 for projects indicating the need for G5 laminates.

G5 glass melamine contains woven glass fabric and a melamine resin coating. It has superior hardness and flame resistance with outstanding electrical properties in low or high humidity conditions. G5 also offers excellent physical strength and arc resistance while meeting 94V-0 UL flammability requirements.

G5 thermoset laminates comply with MIL-I-24768/1 and NEMA G9 standards.

G5 Material and Composition Properties

One of glass melamine’s most significant benefits is that it maintains its ability to deliver superior electrical insulation even in humid or wet conditions. G9 and G5 thermosets have high machinability, excellent mechanical strength, and outstanding dimensional stability.

Specific physical properties include the following:

  • Specific gravity: 1.90
  • Tensile strength: 70,000 pounds per square inch (psi)
  • Flexural strength: 55,000 psi
  • Shear strength: 18,000 psi
  • Bond strength: 1,900 psi
  • Hardness (Mohs Scale): 115
  • Flammability rating: 94V-0
  • Maximum operating temperature: 140 degrees Celsius (284 degrees Fahrenheit)
  • Izod impact strength at 49 degrees Celsius: 12.5 foot-pounds per inch
  • Water absorption over 24 hours: 0.60
  • Coefficient of thermal expansion in degrees Celsius (x10-5): 1.50

Types of G5 and G9 Materials We Supply

At Atlas Fibre, we stock a comprehensive range of glass melamine materials ready to ship to your facility. As one of the largest suppliers of thermoset composites in North America, we offer various glass melamine forms, including:

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

Aside from our in-stock options, we have complete customization capabilities to provide any size, diameter, or thickness of glass melamine you need. Our experienced team can help walk you through all the available options to help you find the best material fit for your project requirements.

G5 Applications and Uses

Glass melamine is one of the most practical, effective, and cost-efficient solutions for electrical applications in outdoor environments. Some of the primary uses of G5 and G9 materials include:

  • Circuit breaker components
  • Arc barriers
  • Terminal boards
  • Switchboard panels
  • Switch mounts
  • Motor wedges
  • Flare bases
  • Specialty terminal blocks

Learn More About G5 and G9 Glass Melamine With Atlas Fibre

If your operation requires a glass melamine thermoset with excellent flame, heat, and arc resistance, G9 composite material could be the perfect choice. If you have any questions about how G9 differs from G5 and whether G9 meets your project’s specific needs, the experts at Atlas Fibre can guide you. Our primary goal is to help you choose the perfect material option that delivers the highest performance while meeting the specifications of your application.

Contact us online or call 847-565-1996 for additional information or a quote.

*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.