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
-----------------------------------------------------
|
