FR-4 and G-10 are the most versatile all-around of the laminate grades and are made by impregnating an epoxy resin binder into continuous glass woven fabric.  G10/FR4 has extremely high mechanical strength, good dielectric loss properties, and good electric strength properties, both wet and dry.  G10/FR4 are widely used in the electronics field – primarily because water absorption is virtually nil, rendering it an excellent insulator.

The difference between G10 and FR4 is that FR4 is a fire-retardant grade of G10.  FR4 can be safely substituted when G10 is called out, while G10 can never be substituted where FR4 is called for.

Color: yellowish to light green

G10 specifies to MIL-I-24768/2 (GEE),  MIL-P-18177 GEE and LP-509

FR4 specifies to MIL-I-24768/27 (GEE-F) and MIL-P-18177 GEE-F

CCT Precision Machining is an industry leader in FR4/G10 Machining.  We are able to maintain tolerances, create features and produce parts that even the material manufacturers deem impossible. By using high speed spindles capable of turning at 30,000 RPM, tightly controlled work envelopes and cutting edge work holding systems, CCT Precision can machine high pressure laminate components from the most simple part to the most intricate part on any of the 25+ machines in our facility.

  • 27” x 15” x 13” Work Envelope
  • Tolerances to +/- .00025” (0.006 mm)
  • Hole Diameters to 0.003” (0.076 mm)

If precision machining of FR4/G10 parts is what you are looking for, Request a Quote today.

Mechanical ASTM Test Method Value Units
Strength to Weight Ratio - - ksi
Specific Gravity @73 F D792 1.82 -
Tensile Strength @73 F, (ult)/(yld) D638 40,000 psi
Tensile Modulus of Elasticity @73 F D638 - psi
Tensile Elongation at Break @73 F D638 - %
Flexural Strength @73 F D790 55,000 psi
Flexural Modulus of Elasticity @73 F D790 2,700,000 psi
Shear Strength @73 F D732 19,000 psi
Comprehensive Strength, (% Deformation) @73 F D695 60,000 (10) psi
Comprehensive Modulus of Elasticity @73 F D695 - psi
Hardness, Rockwell, Scale as noted @73 F D785 M110 -
Hardness, Durometer, Shore D @73 F D2240 - -
Izod Impact, (Notched) @73 F D256 Type A 7.0 ft-lb/in of notch
Coefficient of Friction, (Dry vs Steel) Dynamic - - -
Limiting PV, (with 4 to 1 factor of safety applied) - - psi-ft/min
Thermal ASTM Test Method Value Units
Coefficient of Linear Thermal Expansion @73 F E-831 (TMA) - in/in/F
Heat Deflection Temperature @264 psi D648 - F
Tg-Glass transition termperature, (Amorphous) D3418 - F
Melting Point, (VS=Vicat Softening Temp.) D3418 - F
Continuous Service Temperature in Air, (Max.) - 285 F
Thermal Conductivity - - BTU-in/hr-ft2-F
Electric ASTM Test Method Value Units
Dielectric Strength, Short Term D149 400 Volts/mil
Volume Resistivity D257 - ohm-cm
Dielectric Constant @10E6 Hz D150 5.2 -
Dissipation Factor @10E6 Hz D150 0.025 -
Flammability @3.1 mm unless noted UL94 V-0 -
H2O ASTM Test Method Value Units
Water Absorption, Immersion, 24 hours D570(7) 0.10 % by weight
Water Absorption, Saturation D570(7) - % by weight