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G10 FR4

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G10/FR4 Machining

To meet the needs of our diverse client base, American Micro Industries works with a wide range of materials and processes. As a partner to everyone we do business with, we specialize in matching the client and the job with the best possible solution.

Garolite G10/FR4 is one of the most versatile and widely used laminates for a variety of applications. It's also one of our most popular material options. On this page, you'll find detailed information about G10/FR4's specifications, applications and benefits, as well as a look at some potential alternatives.

What Is Garolite G10/FR4?

Garolite G10/FR4 is a thermoset glass-reinforced laminate first introduced in the 1950s. It is made from an alkali-free electrical glass cloth that has been impregnated with an epoxy resin and treated with pressure and heat. The result is a product that is strong and stable and meets UL 94V-0 standards for flame retardance.

AMI can source G10/FR4 in a variety of shapes and configurations to meet the needs of your project.

Properties and Characteristics

GR10/FR4's material characteristics make it an excellent laminate for applications requiring a minimum 0.005” thickness. Its superior electrical properties are consistent across temperatures and humidity levels. It meets MIL-I-24768/28 GEB-F requirements.

G10/FR4 has the best dielectric strength — up to 500 volts/mil — of any phenolic we work with. It also offers 70,000 PSI of flexural strength, as well as good bond strength and impact resistance, and low water absorption and dissipation factors.

Our product is naturally green in color, though we can special-order other colors as well. A copper-clad version is also available.

Potential Applications

G10/FR4's properties make it an ideal choice for complex, high-precision electrical insulator projects. Electrical insulators restrict the flow of an electrical current, providing protection for anyone who comes in contact with them while ensuring the completion of the circuit and the structural integrity of the product.

Some of the many products that use G10/FR4 material include:

  • Lighting fixtures and other switches
  • Timers, transformers and other electrical controls
  • Arc barriers
  • Terminal and printed circuit boards

And more. For information about whether or not G10/FR4 is the right choice for your project, contact AMI to speak with one of our engineers directly.

Material and Processing Options

Garolite G10/FR4 is available in 36" by 48" sheets up to 0.005” thin, as well as rods and tubes in a range of sizes. We are fully equipped to process G10/FR4 material using the following methods:

  • Die cutting: Die cutting is a fast and cost-effective way to mass-produce parts made from thin material sheets. Our capabilities include rotary die cutting, steel rule die cutting, kiss cutting and more.
  • Laser cutting: Laser cutting uses highly precise lasers to create custom shapes in GR10/FR4 and other materials. Laser cutting's extreme precision makes it the best choice for any project requiring tight dimensional tolerances or other complex specifications.
  • CNC machining: CNC machining uses computer controls to automate feed rate, coordination, speed, location and other machining processes. This allows for a faster turnaround of large orders with exceptional consistency and a high level of quality control.

Each project has different requirements, which means there is no such thing as a one-size-fits-all solution when working with G10/FR4. One benefit to working with AMI is that we have the in-house capabilities to take on any job — we'll recommend the right process for your application based on our in-depth industry expertise and experience with all types of phenolic machining.

Other Garolite Phenolics

G10/FR4 is just one of the phenolic laminates we work with. Other Garolite materials available for your project include:

  • G11/FR5: G11/FR5 is closely related to G10/FR4 but offers improved insulation and performance at higher temperatures. Like G10/FR4, it has good mechanical and dielectric properties in both dry and wet conditions. However, G10/FR4 is slightly harder.
  • G5/G9: G9 or G5 — both terms refer to the same product — is a phenolic laminate made with a melamine resin binder. G5/G9 is among the hardest phenolics on the market today, offering dimensional stability, caustic resistance and arc resistance in addition to its superior strength.
  • G7: Garolite G7 is suitable for use as electrical, heating and appliance, or MIL-I-24768/17 GSG-compliant insulation thanks to its heat and arc resistance. It is made with a silicone resin binder which provides good dielectric properties under both dry and humid conditions.
  • GPO1: GPO1 is phenolic made from glass-woven cloth and polyester resin. It has a mechanical thermal index of 329°F, which makes it suitable for use in Class F insulation systems.
  • GPO3: GPO3 is an electrical-grade version of GPO1 that features 180-second arc-resistance. It meets UL 94V flammability standards, making it ideal for manufacturing arc-resistant electrical insulation found in high-voltage switchgear, transformer parts, bus bar supports, TV components and more.

For detailed specifications and more information about alternatives to G10 Garolite sheets, please contact the AMI office directly.

Choosing the Right Material

Your choice of material plays a role in the quality of your part or product. It's for this reason that AMI offers G10/F4 Garolite sheets alongside other phenolic options. Choosing the right material for your project requires careful consideration of several factors:

  • How the part will be used and the stresses it will be subjected to
  • What environment it will be used in
  • What stress load it will be subjected to
  • What level of dimensional tolerance will be required
  • Your budget and your timeline for completion

Reviewing the material properties of G10/FR4 should be your first step in determining whether or not it's right for you. For help or other technical assistance, talk to AMI today.

Working With AMI

Having the right materials is only one component of bringing a product to market. Partnerships with machining or die cutting experts are essential to ensuring your project meets its benchmarks.

AMI provides fast turnaround times for all machining and cutting projects. We offer low tooling costs and no minimum order requirements, which makes it easy to keep your project on budget.

We are a partner to manufacturers, defense contractors and other demanding clients. We do whatever it takes to achieve total satisfaction, 100% of the time. To request a quote or learn more about the benefits of working with Garolite G10, contact us by phone or email at your convenience.

Features of our machined and die-cut G10/FR4 insulators include:

  • Glass Base Epoxy Binder
  • High Flexural, Impact and Bond Strength
  • Good Electrical Properties
  • 500 volts/mil Dielectric
  • 70,000 PSI Flexural Strength
  • Green in Color (Natural)
  • Special Order in a Variety of Colors
  • Copper Clad also available
    (Single or Double Sided)

G10 FR4 is available in:

Micarta ® Phenolics

Contact Us to Learn More About G10/FR4 Capabilities

Contact American Micro Industries today to learn more about our custom G10/FR4 machining and die-cutting capabilities and to request a no-obligation quote. Give us a call at 1-866-765-9191 or fill out and submit our convenient online contact form and we will get back to you as quickly as possible.

No Minimum Order  -  Low Tooling  -  Fast Turn Around


G10/FR4 - 36" x 48" Sheet Stock

GTN005 0.005"
GTN010 0.010"
GTN015 0.015"
GTN020 0.020"
GTN025 0.025"
GTN031 0.031"
GTN045 0.045"
GTN062 0.062"
GTN093 0.093"
GTN125 0.0125"
GTN187 0.187"
GTN250 0.250"
GTN375 0.375"
GTN500 0.500"
GTN625 0.625"
GTN750 0.750"
GTN875 0.875"
GTN1000 1.000"
GTN1250 1.250"
GTN1375 1.375"