The Candor Advantage for Heavy Copper PCBs

With our Panel Plating Technology heavy copper boards have superior even plating. We can put 6 oz of copper evenly in the hole as well! With our PPG liquid photo resist. deep trenches have no issues and close to perfect etching is achieved.

Benefits of Heavy Copper PCBs

Copper PCBs are designed with thicker copper layers than traditional PCBs, making them an attractive option for boards with their improved carrying capacity, enhanced durability, and increased thermal management. They are ideal for high-power applications, and the thickness of copper PCBs ranges from 3 oz to 20 oz, above the standard 1 oz. Heavy Copper PCBs can be improved through Panel Plating Technology.

There are several benefits of Heavy Copper PCBs, such as:

  • Higher Carrying Capacity
  • Increased Thermal Management
  • Enhanced Durability
  1. Higher Carrying Capacity

    Heavy Copper PCBs can handle higher currents that go through copper layers. These thicker copper layers allow PCBs to carry higher currents without overheating or altering a board’s characteristics. They are ideal for power electronics that require higher currents. Heavy Copper PCBs can handle currents 30 amps or larger, depending on the thickness of the layers and the way the board is designed.

  2. Increased Thermal Management

    Proper performance and reliability in electronic appliances depend on critical heat dissipation. Heavy Copper PCBs are specially designed to enhance thermal performances, because of thicker copper layers. These copper layers provide enhanced thermal mass that dissipates heat away from critical components, reducing the risk of thermal damage. Heavy Copper PCBs are ideal for use in devices where heat dissipation is a significant problem, such as high-power applications.

  3. Enhanced Durability

    Heavy Copper PCBs have enhanced durability, making them a more attractive option for PCBs facing mechanical stress or increased thermal cycling. Their boards are more robust and less susceptible to wear and tear during these applications. They also have higher lifespans than traditional PCBs, meaning they are ideal in situations that require more reliable boards.

Heavy Copper Circuit boards are ideal for applications in Power Electronics, the Automotive Industry, and the Aerospace Industry, where wear and tear, thermal cycling, and reliability are especially important. Heavy Copper PCBs are needed when higher currents and thermal management are crucial issues, such as power supplies, motor controllers, automotive electronic systems, aerospace applications, and other systems where the temperature fluctuates rapidly. Mechanical stress is also a consideration, especially where harsh environments must be accounted for.

Quality Assurance and Testing

Heavy Copper Circuit Boards must undergo rigorous quality assurance and testing to ensure that they can withstand extreme temperatures, mechanical stress, and advanced wear. Quality assurance processes and testing procedures significantly boost the reliability of Heavy Copper PCBs, and ensure that these boards can stand up to continuous use in advanced systems.

All Heavy Copper PCB products undergo a rigorous quality inspection process that guarantees defect-free PCBs on delivery and meets the highest quality standards. The Heavy Copper PCB inspection process includes an initial comprehensive inspection of the article, an automatic inspection that looks for any defects, an X-ray inspection to detect anything not visible to the human eye, a final quality assurance inspection, and a function test.

Candor’s quality assurance and testing processes strive to continuously improve product performance. All Candor products are well-tested, reliable, and meet high standards. We are a green company that cares about the quality of our environment, which is why we implement eco-friendly solutions throughout our Heavy Copper PCBs design processes. Candor delivers top-notch products with reliable shipping, timely delivery, and consistently thoughtful design.

Candor uses only the most high-quality heavy copper material, which exceeds class 3A elongation, purity, and tensile strength. Achieve all of the benefits of an even distribution of power on your board. The heavy copper PCB is ideal for high-current applications and provides significant thermal sinking capabilities.

You want your printed circuit board to made out of the best material possible. The quality should be high, and the precision should be nearly perfect. Candor’s PCBs has all of that and more.

We make your printed circuit boards out of heavy copper. The material we used is top-rated for companies across Canada and the United States. It surpasses class 3A elongation, as well as tensile strength and purity.

Your tensile strength and elongation on the board tell you how rugged the plating used is. The higher the measurements are will tell you how many more heating cycles your board will handle. Our levels surpass conventional board shop measurements.

The heavy copper boards, mixed with the panel plating technology, gives our boards and even, superior plating. We can distribute the copper evenly across the whole manufactured panel with our panel plating technology. The result – a consistent design that we can fabricate quite simply. Uneven distribution can result in a failing printed circuit board.

Our PPG liquid photoresist achieves almost perfect etching on your heavy copper PCB. We use a wet process that delivers better results than using dry films. The result is no adhesion failures, defects and better etching lines. The whole process is quick, saving you time and money.

So if you are looking for a durable, constant and nearly perfected printed circuit board, our heavy copper boards will achieve those results. Ask us to learn more and request a quote to build your next circuit board.

We’ve worked with Candor for over twenty years, and continue to be happy working with them. They are our first choice for PCB’s and provide a reliable and quality product. Candor has helped us create a number of special boards for our products with environmental issues such as dielectric, thermal and humidity requirements. They always provide on time service and good feedback whenever questions are raised. Candor always adapts to our needs and requirements making it easy to work with them.

Dana L.,  

“I have been using Candor for over a decade and there are always there for customers. The customer service and engineering group it up there with the TOP GUNS. If the customers have any issues Candor is there for you to make it right. The board quality and manufacturability ability is top notch and have solutions to your needs. “


Frequently Asked Questions (FAQ)

What are the differences between a standard PCB and heavy copper PCB?

There are a few differences between Standard PCBs and Heavy Copper PCBs, such as:

  • Heavy Copper PCBs have a standard thickness of 3 oz, while traditional PCBs have a thickness of 1 or 2 oz.
  • Heavy Copper PCBs are used in power electronics over normal circuits.
  • Heavy Copper PCBs have higher conductivity.
  • Heavy Copper PCBs provide better heat distribution and thermal cycling.
  • Heavy Copper PCBs have sturdier mechanical stability.

What are the weight and thickness of heavy copper PCB?

Copper thickness is measured in ounces, and factors of weight and thickness make Heavy Copper PCBs different from other types of printed circuit boards by making them ideal for electronic devices such as power supplies, aerospace devices, and automotive devices. Heavy Copper PCBs typically weigh about 3 oz or more.

What are the applications of heavy copper PCB?

There are many applications of Heavy Copper PCBs, including:

  • Solar Power Converters
  • Automotive Industries
  • Military Equipment
  • Protective Relays
  • Rail Traction Systems
  • Nuclear Industries
  • UPS Systems
  • Welding Equipment
  • Safety and Signal Systems
  • Aerospace Manufacturing

How is heavy copper PCB fabricated?

Heavy Copper PCB fabrication combines a thick plating of copper with the weight of an appropriate substrate. This is done via a through-hole circuit, making all Heavy Copper PCBs a reliable wiring platform. The boards are manufactured with plating and etching techniques—these techniques in PCBs are used to add copper thickness through sidewalls and plated holes. Perfect etching is achieved through several methods to ensure unwanted copper is removed from the circuit board.


Heavy Copper PCBs do require unique plating and etching methods to ensure there is extra copper thickness. The fabrication of Heavy Copper PCBs is incomplete by standard etching techniques and requires additional steps and resources compared to standard PCBs. Streamlined manufacturing processes such as PPG liquid photoresist cut out the many problems related to conventional manufacturing processes.


Contact us today to begin your custom Heavy Copper PCB project. Candor’s engineers are happy to build you a prototype specific to your needs. 

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