Olivia,

I have run into this on various occasions - the key is, if you cannot
see it, it is not there. In other words if you can see the PTH, but you
cannot tell if the solder is at least up to 50% fill (Class 2 with
internal heat robbing layer) - then you have to take the position, that
it is a defect. You have to see it to pass it.
However, as with most of 610-C & J-STD-001, if you can PROVE your
process does in fact accomplish the minimum 50%, then it is acceptable.
The proof may cost more and take so much time, it may not be worth it.
And since it is a process that is being relied upon to give you the
minimum 50%, you better have it fully documented.

Tom



Olivia Mc Dermott wrote:
>
> In the event of a dispute over the vertical fill of 50% for class 2, how do
> you determine if there is a 50% fill when no solder is evident on primary
> side of PCB and you can't determine any solder in the barrel. PCB thickness
> prevents determination.
>
> _________________________________________________________________
> Join the world’s largest e-mail service with MSN Hotmail.
> http://www.hotmail.com
>
> ---------------------------------------------------------------------------------
> Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL
> Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
> Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
> information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
> ---------------------------------------------------------------------------------

---------------------------------------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt delivery of Technet send the following message: SET Technet NOMAIL
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
---------------------------------------------------------------------------------