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Fiberglass Sheets (G10/FR4) – Natural



ACP’s G-10/FR4 Fiberglass Sheets are solid, high strength laminates consisting of fiberglass prepreg reinforced with high strength epoxy resin.

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ACP’s G-10/FR4 Fiberglass Sheets are solid, high strength laminates consisting of fiberglass prepreg reinforced with high strength epoxy resin. They are versatile all-around laminates suited for pattern templates, surface sheeting or anywhere a flat, smooth fiberglass sheet is required. The Natural Fiberglass Sheet is manufactured without any tints or pigments, leaving only the natural fiberglass color.

Fiberglass Sheets are Autoclave cured at high temperatures and pressure to ensure a strong, rigid product that cannot be re-shaped after cured. Unlike wet layup, Autoclave curing consistently yields flat, lightweight sheets with minimal voids, waves or buildups.

Our Fiberglass Sheets are FR4 grade fire retardant and can be safely substituted where G10 is called for. Beyond their electrical insulating properties, Fiberglass sheets exhibit great dimensional stability and superior adhesive properties. They have extremely high mechanical strength, good dielectric loss properties, good electric strength properties and excellent chemical resistance, not only at room temperature but also under humid or moist conditions.



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Physical Properties

  • Thickness: .005″,.010″ +/- .002″
  • Thickness: .015″ +/- .003″
  • Thickness: .020″ +/- .004″
  • Thickness: .030″ +/- .006″
  • Length/Width: +/-0.50″
  • Material: G10/FR4
  • Resin Matrix: Epoxy
  • Color: Natural
  • Finish: Smooth Gloss, Smooth Matte*

Technical Properties

  • Tensile Strength, Lengthwise: 40,000 psi
  • Tensile Strength, Crosswise: 35,000 psi
  • Compressive Strength, Flatwise: 60,000 psi
  • Compressive Strength, Edgewise: 35,000 psi
  • Flexural Strength, Lengthwise: 55,000 psi
  • Flexural Strength, Crosswise: 45,000 psi
  • Modulus of Elasticity in Flex, Lengthwise: 2.7 psi x 106
  • Modulus of Elasticity in Flex, Crosswise: 2.2 psi x 106
  • Shear Strength: 19,000 psi
  • IZOD Impact, Flatwise: 7 ft lbs per in of notch
  • IZOD Impact, Edgewise: 5.5 ft lbs per in of notch
  • Rockwell Hardness M Scale: 110
  • Specific Gravity: 1.82
  • Coefficient of Thermal Expansion: 0.9 cm/cm/deg C x 10-5
  • Water Absorption: 0.25% per 24 hrs on .062″ thick
  • Flame Resistance: 94V-0
  • Bond Strength: 2,000 lbs
  • Max Operating Temperature: 285°F

Please note: All data to be used as a guide only; not a specification. *Surface finish may contain minor blemishes or imperfections – they will not impact the performance of the product.

 ~Weight per ft²

  • .005″: 0.38 oz.
  • .010″: 1.4 oz.
  • .015″: 2.6 oz.
  • .020″: 3.4 oz.
  • .030″: 4.8 oz.


Need something different? We’ve got you covered. As a leading manufacturer of composite structures you can rely on us to provide rapid, cost-effective and high-quality solutions to meet and exceed your project requirements.

We MAKE it. Our design and manufaacturing team can work with you to fabricate custom fiberglass sheets. Options include:

  • Fiber Selection: Carbon Fiber, Fiberglass, Kevlar®, Other
  • Thickness
  • Layup/Construction
  • Surface Finish
  • Sizes up to 60″ x 120″*

*ACP has a maximum work envelope of 60″ x 120″. Available options are contingent on tooling and material availability. KEVLAR® is a registered trademark of E.I. du Pont de Nemours and Company and is used with permission.

We CUSTOMIZE it. We can tailor our stock products to meet your needs by offering the following services:

  • CNC Machining
  • Cutting
  • Silk-Screening
  • Painting
  • Clear Coating
  • Countersinking
  • Bonding


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