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Copper Clad

What is Copper Clad FR-4?

Copper clad is FR-4 glass epoxy sheet laminated with copper. Sheets ranging in thickness from .007″ to .250″ are laminated either one side or two sides with copper. The thickness of the copper is measured in ounces per square foot with a typical range of 1/2 ounce to up to 2 ounces. Of course, the sheet thickness and the copper clad weight can be specified outside these typical ranges.

Copper Clad FR-4 has become the standard of the printed circuit industry. This product possesses high mechanical strength, good machinability and consistent drilling qualities, such as minimum bit wander and excellent hole plate-through.

The resin for FR-4 is brominated to provide a UL 94 V-0 fire resistance without degrading the laminate quality or performance. No other retardants or additives are introduced to the material.

With circuitry traces getting narrower, spaces tighter, and plated through holes occupying a greater percentage of circuit board requirements, the dielectric strength and qualities of FR-4 are critical to both high yield and product reliability.

“Properties”, “Applications” and “Availabilities” for the Copper Clad are at the bottom of this page.

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Copper Clad
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Properties, Applications and Availabilities for Copper Clad

Properties Applications Availabilities
UL 94 V-0 rated Television, radio and studio products Sheet: .007″ to .250″
High mechanical strength Military hardware Copper Cladding: (oz/ft²) 1/2, 1, 2
Good machinability Telecommunications Standard Color: Copper
High electrical properties Business machines  
Consistent drilling qualities Medical electronics  
Chemical resistant Computers and peripheral equipment  
Excellent dielectric strength Instrumentation  
  Consumer products  
  Industrial controls  
  Games and recreation  
  Automotive and transportation  

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