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
-----------------------------------------------------