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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 more than 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 and survivability for additional information.


Industries Served Using Heavy Copper Circuit Boards

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

Heavy Copper Printed Circuit Board

Contacting Your PCB supplier for Heavier Copper Circuit Boards

Knowing when to contact manufacturing for heavier copper circuit board designs will help save cost on your product. Redesigns can quickly sink your budget. Having a willing manufacturing service to help you succeed at the prototyping level is a win for both of us as a team.

Materials are costly, and lead times are typically longer for heavy copper laminates and not always in stock. As a leading manufacturer in heavy copper and extreme copper PCBs, we understand the process and what is needed to get the job done right the first time.

When designs are too tight for processing and scrap happens, we all lose. We have engineering available 24/7 to process DFM and to provide feedback information to you on what changes need to be made to help us both succeed. Engineering will process your design for manufacturing request and provide a detailed response, including photos and locations of possible troubled areas.

Engaging with your printed circuit boards manufacturing service is critical to the success of your prototype or production orders going smoothly.

Heavy Copper PCB Capabilities

Consider the following capabilities when thinking of using heavier copper designs. Provide information to production about the PCB. What is the end product the part will be installed into? Will it be exposed to the elements, extreme heat, or extreme cold or water?

Prototyping is common in heavy copper product, UL approvals, and timelines. Knowing more helps us to help you succeed. Is this going to be an ongoing project for years to come? We have several options for production to produced small to large volume, or, is it a small one-time buy?

Explore stocking programs, EAU cost savings, and Kanban. All options are available at Epec.

  • Maximum Number of Layers = 20
  • Laminate - FR-4 (All Tg Ranges), Teflon, Ceramic
  • Finished Thickness = 0.020" - 0.275"
  • Green, Blue, Red, Black, Clear and 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 = 0.012"
  • Minimum Holes Size - 0.008" +0.005"/-0.008"
  • Maximum Hole Aspect Ratio = 10:1
  • Maximum Copper Weight = 6 oz. (UL Approved)
  • Controlled Impedance +/- 10%
  • Minimum Silkscreen Line Width - 8 mils

Production Minimums

Below is a set of guidelines for data design to follow when it comes to layout. Not all circuit boards are alike, so not all designs fit into all production facilities. For these reasons, we have created a top-notch supply chain to produce all your heavy copper PCB requirements. Following these rules will allow for manufacturing to produce your PCB with standard process setting, decrease time to produce, and minimize fallout.

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 70 Years of Manufacturing Excellence
America's Oldest. A History of Innovation.

Over the past 70 years, the electronics manufacturing industry has changed dramatically as the industry continues to adapt to evolving demands and technology. Epec is at the forefront of innovation, with the expertise and agility to move at the speed of today’s businesses. 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 new product introduction (NPI) process that helps our customers get to market faster, 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 70 years and then some.

Learn more about our 70 year story →





Celebrating 70 Years - Epec Engineered Technologies