Gold PCB in the wave needs higher preheat than HASL for via and through
hole filling on some soldering machines. On other equipment, no changes are
required for complete filling. I won't state brands on Technet to avoid
advertising.
Contact me off line if this is the problem you've encountered.
Aric Parr
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Subject: [TN] Gold Plating and solderability ?
Author: JB <[log in to unmask]> at INTERNET