Copper-Invar-Copper PCBs

Copper Invar Copper was introduced into the printed circuit board industry to combat the differing coefficient of thermal expansion encountered when bonding very dissimilar materials together.

In high temperature environments Copper Invar Copper is sometimes use to strengthen the printed circuit board and control expansion.

Copper Invar Copper is a layer of invar which is a nickel containing iron alloy sandwiched in between two layers of copper.

Copper Invar Copper is readily available in the two thicknesses shown below:

Total Thickness

0.06″ (0.152mm)

0.10″ (0.254mm)

Copper

0.019mm

0.051mm

Invar

0.113mm

0.152mm

Copper

0.019mm

0.051mm

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