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Is water break test also applicable to FR-4?

2007

We currently encountering bubbles on our flex cicuit. We attach PSA to flex and adhere it
on FR4. We did a lot of stuff on lamination to optimize the process but still got bubbles. Then I come up with idea of contamination on FR4.I am doing "water break test" but am not
full confident if I am doing it right.

Jose G. Lachica
Flexible Circuit - Cavite, Philippines

Your best definition of a "water break test" is found in Standard Test Method for Hydrophobic Surface Films by the Water-Break Test Document Number: ASTM F22. It details to exacting detail all the nuances of performing the test and how to interpret it.

Milt Stevenson, Jr.
Syracuse, New York
2007

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