G-10 (FR-4 Grade)

Strong enough to meet your needs with a host of specialized electrical properties, low water absorption, and fire retardancy, G-10 FR-4 grade is the go-to material for your electronic parts, robotics endeavors, and marine applications.

  • Available thicknesses range from .063″ – .375″
  • Waterjet cut composite (+/- .009″ cutting tolerance)
  • 2-4 day lead time before shipping
  • USA sourced

Starting from $29

Low Water Absorption
Superior Electrical Properties
Fire Retardant

What is G-10 (FR-4 grade)?

Our G-10 is made up of a mixture of epoxy resin and glass cloth, so you know it’s got strength under pressure. With superior electrical insulation properties, when both wet and dry, it’s the most widely used insulator for electrical applications in the industry. It boasts incredibly high mechanical strength and rigidity and has excellent dimensional stability over a wide temperature range, along with low water absorption rates.

Honestly, G-10 FR-4 is used most often in laminate circuit boards, but it does have a great many uses including insulating washers and transformer components. You’ll also find it used in firearm and knife grips due to its ability to take texture and color well. Any time you’re interacting with consumer electronics, you can assume that you’re in the vicinity of G-10 somewhere.

What can you make with G-10?

If you need something to get wet and be lightweight while doing it, G-10 is the material for you. Often used in marine applications for housings and electronic components, this versatile composite is able to withstand harsh marine environments. Some spearfishermen even use it as the primary material for their spear guns due to its lightweight nature and low water absorption.

Machining G-10 FR-4 parts can be challenging for some, but that’s why you come to SendCutSend with your designs, you can trust us to handle the heavy lifting for you and let you focus on the big picture.

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Material Details

.063″ G-10 (FR-4 grade)

Advertised Thickness .063″ | 1.6mm
Gauge N/A
Thickness Tolerance Positive .008″
Thickness Tolerance Negative .008″
Cutting Process Waterjet
Cut Tolerance .009″
Top/Bottom Finish Identical both sides
Sourced from USA
Available Operations
Deburring No
Bending No
Countersinking No
Tapping No
Anodizing No
Plating No
Powder Coating No
Hardware No
Tumbling No
Design Considerations
Min Part Size 1″ x 2″
Max Part Size 46″ x 30″
Min Hole Size .070″
Min Bridge Size .063″
Min Hole to Edge Size .020″
Tab and Slot Tolerance .015″
Material Composition G10 is a thermoset resin formed by the polymerization of phenol and formaldehyde, which can then be impregnated with glass cloth material to form an industrial laminate.
Density 112.32 lb/ft^3
Tensile Strength (Yield) Lengthwise: 45 ksi
Crosswise:  38ksi
Shear Strength Lengthwise: 75 ksi
Crosswise:  65 ksi
Comprehensive Strength 65 ksi
Flexural Modulus Lengthwise: 2.7 ksi
Crosswise:  2.4 ksi
Isod Impact (Notched), ft-lb/in Lengthwise: 13 ksi
Crosswise:  14 ksi, 12 ksi
Rockwell Hardness M110
Elastic Modulus  
Poisson’s Ratio  
Thermal Conductivity 2 BTU-in/hr-ft^2 °F
Flammability Ratings VO
Magnetic No

Our G10/FR-4 steel is guaranteed

We guarantee awesome quality parts. If you’re not 100% happy, we’ll give you a refund or remake on the spot – no questions, no hassle.

Plastic, composite, and wood materials cut on our CNC machine will have small tabs.

These tabs hold your parts in place while being cut to ensure the best accuracy possible. Click below to learn what to expect and how to best design with these tabs in mind.

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We proudly use hardware by PEM

Flush stud, M8 x 1.25, .472" Zinc plus Clear Chromate

Thread SizeM8 x 1.25
Hole size in sheet (+0.003/-.0.000).315″
Minimum sheet thickness0.94″
Maximum sheet thickness.347″
Fastener materialSteel
Minimum distance hole C/L to edge0.378″
When determining the distance between two or more fasteners, you can calculate the distance by the formula, C/L to edge + 1/2 the diameter of the second mounting hole..535″
Recommended panel materialSteel/Aluminum
Coating typeZinc
Aluminum material ranges (5052, 6061, 7075)0.100″-0.250″
Steel material ranges (CRS, HRPO, HR)0.104″-0.250″

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We proudly use hardware by PEM

Flush Standoff, 4-40, .250" Zinc plus Clear Chromate

Thread Size4-40 x .250″
Hole size in sheet (+0.003/-.0.000).168″
Minimum sheet thickness0.040″
Maximum sheet thickness.125″
Fastener materialSteel
Minimum distance hole C/L to edge0.230″
When determining the distance between two or more fasteners, you can calculate the distance by the formula, C/L to edge + 1/2 the diameter of the second mounting hole..314″
Recommended panel materialSteel/Aluminum
Coating typeZinc
Aluminum material ranges (5052, 6061, 7075)0.040″-0.125″
Steel material ranges (CRS, HRPO, HR)0.048″-0.119″