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Heavy Copper Printed Circuit Boards

Epec has been building heavy copper circuit boards with traces and copper planes of up to 6 ounces for over 20 years. Our expertise is in producing at a reasonable cost, heavy copper PCBs that are of proven designs. Our engineering team can work with you to review your design to make sure that they can be manufactured with the highest quality at the best overall cost.

Be sure to check out our blog post on heavy copper circuit board strength & survivability for additional information.


Industries Served Using Heavy Copper Circuit Boards

  • Welding Equipment
  • Solar Panel Manufacturers
  • Power Supplies
  • Automotive
  • Electrical Power Distribution
  • Power Converters

Heavy Copper Printed Circuit Board

Heavy Copper PCB Capabilities

  • Maximum Number of Layers = 16
  • Laminate – FR-4 (All Tg Ranges), Teflon, Ceramic
  • Finished Thickness = .020" - .275"
  • Green, Blue, Red, Black, Clear & White Solder Masks & Legend Inks
  • Minimum Soldermask Clearance – 6 mils
  • Minimum Solder Dam Width – 5.5 mils
  • Hot Air Solder Leveling (HASL)
  • Immersion Gold (ENIG) & Immersion Silver
  • Blind & Buried Vias
  • Minimum Drill Bit Hole Size = .012"
  • Minimum Holes Size - .008" +.005"/-.008"
  • Maximum Hole Aspect Ratio = 10:1
  • Maximum Copper Weight = 6 oz. (UL Approved)
  • Controlled Impedance +/- 10%
  • Minimum Silkscreen Line Width – 8 mils

Production Minimums

Measured in Inches Hoz 1oz 2oz 3oz 4oz 5oz 6oz
Min. Conductor Width 0.004 0.005 0.006 0.007 0.008 0.009 0.010
Min. Conductor Spacing 0.004 0.006 0.008 0.012 0.014 0.017 0.020
Min. Pad to Pad Spacing 0.004 0.006 0.008 0.012 0.014 0.017 0.020
Min. Conductor-to-Pad Spacing 0.004 0.006 0.008 0.012 0.014 0.017 0.020
Min. PTH Annular Ring 0.006 0.006 0.008 0.009 0.011 0.013 0.014
Min. VIA Annular Ring 0.006 0.006 0.008 0.009 0.011 0.013 0.014
Min. Distance - Hole to Board Edge 0.010 0.010 0.010 0.010 0.010 0.010 0.010

See our EXTREME Copper PCBs for information on copper weights over 6 oz.

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Heavy Copper Circuit Boards

15 Ways To Design Reliability Into Your Heavy Copper PCBs

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15 Ways To Design Reliability Into Your Heavy Copper PCBs - Ebook
Celebrating 65 Years of Manufacturing Excellence  Learn More →
America's Oldest. A History of Innovation.

Today at Epec, the customer comes first, and everything we do must be put through that filter. Whether it is developing e-commerce platforms to make it easier to work with us, or creating a NPI (new product introduction) process that helps our customers get to market faster, or the other 10 new projects we have in process, we must focus on building the new. By doing that every day, and by always making the customer our top priority, we plan on being here for another 65 years and then some.

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Celebrating 65 Years - Epec Engineered Technologies