PCB | September 26, 2006
Bleeding Edge: Extreme Printed Circuit Boards -- "Down the Hole"
"Down the Hole" oil-well sensing is one example of an extreme printed-circuit application in severe conditions, featuring very high temperatures of 200° C and high pressures of 2000 psi.
The biggest problem to solve is the laminate's ability to withstand high temperature without delaminating and without cracking the vias. A few companies, such as Rogers and Panasonic, sell a new very-high-TD laminate at 440° C, featuring good copper-bond strength and improved thermal-cycle crack resistance.
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