Contronic Devices makes a good flex mask that is easy to put on and remove. Their number is 714.897.2266 ask for Robert. This is probably the best way to avoid the problem. Regards, Ramon > -----Original Message----- > From: Morse, Carrie [SMTP:[log in to unmask]] > Sent: Thursday, January 15, 2004 10:27 AM > To: [log in to unmask] > Subject: Re: [TN] Solder Sticking To SS Screws > > Joe, > We use OA flux and do not have a problem with SS screws. Anyone else out there having a problem with OA flux and SS hardware? (Make sure they are SS and not Zinc Plated or something else.) > > Latex mask is easy to use and we have found a mask that is not messy. > We apply it straight from the bottle or using a dispenser. > > Kapton dots can also be used -- those are a bit neater, but, a bit more expensive. > > Nylon screws do exist and we do not have problem with those going thru wave either. > > -Carrie > > -----Original Message----- > From: Kane, Joseph E [mailto:[log in to unmask]] > Sent: Thursday, January 15, 2004 10:20 AM > To: [log in to unmask] > Subject: [TN] Solder Sticking To SS Screws > > > Because connector screws get Loctite, we use stainless steel temporary > hardware on bottom sides of some of our motherboards, and screw heads and > washers travel through the solder wave. With the switch from RMA to OA > flux (Alpha 3355-HB), we find that solder now adheres to the hardware. > Here are some of our options: > > 1. Use latex temporary solder mask on hardware. Of course, this will be > messy and labor-intensive. > > 2. Find some 2-56 x 1/2" screws in a material that Sn63 won't stick to. > Could they make a screw this small in nylon or diallyl pthalate? > > 3. Apply some kind of plating or Teflon coat. Of coarse, with buildup on > the thread, they may not mate anymore. > > 4. What about a spray-on coating? Would it be worth trying an anti-seize > like molybdenum disulfide? > > Joe Kane > BAE SYSTEMS Controls > Johnson City, NY > > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 1.8e > 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) > To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: http://listserv.ipc.org/archives > Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 > ----------------------------------------------------- > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 1.8e > 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) > To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: http://listserv.ipc.org/archives > Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 > ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------