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December 1999

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Subject:
From:
Geoff Layhe <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 17 Dec 1999 10:09:43 -0000
Content-Type:
text/plain
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text/plain (28 lines)
Hi All,

Can anyone help with this problem a PCB fab customer of mine has?
Process - Electrostatic spray solder mask.
Problem - Soldermask missing from areas. This seems to be related to the
base laminate (FR4). When two identical boards on two different batches
of laminate are processed side by side the problem is always on one
batch. What effect could the laminate have?
What other factors could cause the problem?

TIA
Geoff layhe
www.lamar-uk.co.uk

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