First, let me clarify what I think is your question.  Your 
reference is to IPC-A-610B, section 4.1, Table 4-1.  No such 
table exists in IPC-A-610A.

There is no given percentage for a maximum quantity of pinholes 
as long as the wetting requirements described in Table 4-1 are 
met.  This is stated in the SPECIAL NOTE in section 4.1, page 52 
in the middle of the first column on the page.  Wetting to the 
lead and PTH barrel are the key characteristics which must be met 
assuming the minimum hole fill is met.

Obviously, the more pinholes or voids in a solder joint the more 
likely that this will effect wetting between lead and barrel.  
Hopefully, I've addressed your question.

Bruce Wooldridge
DSC Communications
Vice Chairman, IPC-A-610 Task Group
214/519-6170
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______________________________ Reply Separator _________________________________
Subject: Pinholes
Author:  [log in to unmask] at SMTPLINK
Date:    09/28/95 04:47 PM


To clarify IPC-A-610A Section 4.2 Table 4-1. We are unclear on what 
percentage of pin holes are allowable on supported holes.

Please help !

Please respond ASAP

Thanks