Steve, 30% concentration of Kyzen? Is this stuff pre-diluted? It is my experience that good cleaning will result at concentrations of less than 10%. Most folks I know would prefer to run at less than 5%, 'cos it costs less - but 30%?? Please enlighten me or have I missed the plot..... Regards, Graham Naisbitt [log in to unmask] WEB: http://www.concoat.co.uk CONCOAT Ltd Alasan House, Albany Park CAMBERLEY GU15 2PL UK Tel: +44 (0) 1276 691100 Fax: +44 (0) 1276 691227 ----- Original Message ----- From: Stephen R. Gregory <[log in to unmask]> To: <[log in to unmask]> Sent: Thursday, September 02, 1999 7:16 PM Subject: [TN] Dryfilm mask adhesion, the saga continues... > 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- > > ############################################################## > TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c > ############################################################## > To subscribe/unsubscribe, send a message to [log in to unmask] with following text in > the body: > To subscribe: SUBSCRIBE TECHNET <your full name> > To unsubscribe: SIGNOFF TECHNET > ############################################################## > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional > information. > If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or > 847-509-9700 ext.5365 > ############################################################## > ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################