A 10:1 ratio for LPI mask versus thermal cure mask is certainly very steep
and seems to me a little excessive.

It is true that LPI masks cost more and that the processing is more
complicated. On the other hand, there tends to be less rework with LPI masks
and you should not have "mask on pads" type problems.

I would think that a 3:1 ratio would be about as bad as you should ever
expect.

Larry Fisher
Dexter Electronic Materials

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