Hey Pat, I don't know Uralane but are you doing this in a Cleanroom environment? If so what Class and flow type? Have you tried letting the boards cure in a cleanhood or something? Hans Air Force Material Command - We keep them flying! ~~~~~~~~ Hans M. Hinners WR-ALC/LYPME Bldg. 640 Materials Engineer 380 Second Street, Suite 104 Manufacturing Eng. Sec. Robins AFB GA 31098-1638 912-926-1970 (Voice) 468 - 1970 (DSN) 912-926-7974 (Fax) [log in to unmask] > I need help with a problem I have been fighting for 6 months. We > currently use Uralane 5750 on hi-rel PWA's used in space applications. > Our method of applying is the brush method per NHB5300.4(3J) April 85. > > The quality requirements state that "Coating shall be free from > contamination or foreign material. Any contaminant visible under 4- to > 10- power magnification shall be cause for rejection." > > My problem seems to be the properties of Uralane 5750. It seems to remain > tacky after it is cured and this appears to attract all airborne > particles. Our CSI and GSI inspectors naturally crank up the scopes to > 10 power. I used Humiseal 1B31 in the same environment and do not have > the same problems. > > My main customers Boeing and TRW have both issued CAR's against this > process as it realates to contamination. I am in need of any input that > may help me improve my process. I am a NASA certified Instructor in > Conformal Coating and Staking and have not been able to solve this > problem. > > Any information that would aid me in continuing my career would be greatly > appreciated. > > Pat Lujan > Senior Mfg. Eng. > BFGoodrich Data Systems Div. > Albuquerque New Mexico USA > 505.938.5373 > > ############################################################## > 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 ##############################################################