Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Blisters

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#38631

Blisters | 21 December, 2005

We have small blisters all over the bottom side of a heatsink the measures apprx 4" x 12", flat surface. Is there any chance someone can refer me to some standard or specs for usability, personally I think these little blisters would be ok and not interfer with heattransfer. The blisters are maybe 2-3mil in diameter and no more than 2mil in height.

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#38640

Blisters | 21 December, 2005

If we received heatsinks with blisters on the contact surface, like you describe, we'd reject them. We want that surface to be perfectly flat. Google "heatsink flatness" for more. For instance: http://www.heatsink-guide.com/content.php?content=heatsinkinfo.shtml

We know of no industry standard or specification for usability.

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