After switching from No-clean flux to Water soluble (Kester)we encountered voids problem (X-ray and microsectioning). Reducing the apperture sizes made the voids smaller but did not eliminate them. So we had to go back to No-clean. Any idea why voids occur? Will appreciate any answer.

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2/23/2017 12:46:33 PM
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2/23/2017 12:46:33 PM
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2/23/2017 12:46:33 PM
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2/23/2017 12:46:33 PM
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