Definition: In the PCB industry, the thickness of copper foil is usually expressed in ounces (OZ). 1OZ is equal to 28.35 grams, and in this industry, the thickness of 1OZ copper foil is defined as the thickness corresponding to the weight of 1OZ (i.e. 28.35 grams) of copper foil covering an area of one square foot. Based on the density and quality relationship of copper, the approximate thickness of 1OZ copper foil can be calculated to be 35 micrometers (μ m). Therefore, copper thickness of 2OZ or above refers to copper foil thickness reaching or exceeding 70 microns.
Standard: In practical applications, PCBs with copper thickness of 2OZ or above are usually considered as thick copper plates or ultra thick copper plates. These materials have higher current carrying capacity, better heat dissipation performance, and higher mechanical strength.

High current carrying capacity: Due to the increase in copper foil thickness, thick copper plates can carry larger currents, making them suitable for high-power circuits and situations that require large currents to pass through.
Good heat dissipation performance: Thick copper plates have better heat dissipation performance, which can effectively reduce the heat generated by circuits during operation, and improve the reliability and stability of circuits.
High mechanical strength: The thicker copper foil layer gives the PCB higher mechanical strength, allowing it to withstand greater external forces and pressures, making it suitable for applications that require higher mechanical strength.
Corrosion resistance: The thick copper foil layer can provide better corrosion resistance and extend the service life of the PCB.

Power module: Thick copper plates are widely used in power modules, such as power adapters, primary power supplies, secondary power supplies, etc. These power modules need to withstand large currents and voltages, so thick copper plates are required to ensure the reliability and stability of the circuit.
Automotive electronics: Automotive electronic components also require thick copper plates to carry large currents and provide sufficient mechanical strength. For example, car chargers, car inverters, etc. all require the use of thick copper plates to make circuit boards.
Microwave and aerospace: Thick copper plates also have certain applications in high-tech fields such as microwave and aerospace. These fields have extremely high performance requirements for circuit boards, requiring the use of materials with high reliability, stability, and mechanical strength.
Other fields: In addition, thick copper plates are widely used in network base stations, hybrid integrated circuits, high-power circuits, and other fields.

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