I would not like anyone to qualify using one material and production using
the other! Any significant process or material change (thermal/chemistry)
after the qualification shall have written notification with information
provided by the vendor, in a reasonable advance time zone (4 to 6 weeks)...
Any vendor went ahead did on their own without any notification is putting
their "brand name" on line. It is not acceptable from my point of view...(On
the other hand, if the information was provided to your company on time, but
not communicated to the right personnel, such as production Engineer or
QA..well, it is the assembly company's fault)...Anyway, it should not
happen...jk
At 02:16 PM 9/2/99 EDT, you wrote:
>Hi ya'll!
>
>Well, I'm making some progress about this mask flaking deal. So I thought I'd
>share what I've learned thus far. To refresh, I have a board here that loses
>all it's mask off of every bit of copper after 3-4 washes in a Electrovert
>MCS-1000 cleaner that we run Kyzen Aquanox XJN in at a 30% concentration. The
>board is assembled with RMA based flux, that's why the Kyzen. The wash is
>140º F., and the rinse is 120º F.
>
>The fab vendor says it's our cleaning process that's doing it, but I first
>contended that it's either the mask, or the masking process. They came back
>and pointed out that we're assembling 3 other boards with dryfilm mask, so
>why isn't there problems with the other 3 assemblies? So I says;
>hmmmm...(babbling to myself as usual...hehehe)
>
>There is one difference between the flakey board and the other three, the
>flakey board is a PCI card that has gold plated fingers while the other 3
>doesn't have any gold plated on them at all...
>
>But I went back in the stockroom and looked at the bare fabs of the other 3,
>and could obviously see that a different brand dryfilm mask had been used
>with them.
>After a conference call today with the fab vendor, we did find out that there
>WAS two different masks being used. I'm not trying to slam any mask over the
>other, just relating my experiences, but the flakey mask is a DynaChem KM,
>and the other is a Dupont 8140. They said they would switch over to the
>Dupont mask....(I'm thinkin' to myself, WHY didn't they do that months ago
>when all this started? Especially since they built 3-different lots of boards
>with the DynaChem mask after first receiving the first complaints? They had
>at least TWO chanches to switch! But nooooo...)
>
>The $30,000 dollars we got into components and assembly labor on boards that
>have bare-naked traces and vias is still being contested, because they said
>they complied with the drawing since no certain mask was specified, just the
>IPC spec, basically saying that's it's our problem we use Kyzen Aquanox XJN.
>Sounds kinda' lame to me, but thank goodness at least I'm outta that loop!
>
>Least now I know what kinda dryfilm mask NOT to use with Kyzen (I'd rather
>not have to deal with dryfilm at all, but whatcha gonna do?)
>
>-Steve Gregory-
>
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