Steve:

First off this spec has been cancelled as of June, 1995.(you must know this
by now)

But if your customer specifies Mil-Std-2000A, just follow the spec. If you
refer to the spec, see paragraph 4.6.3 which addresses the use of
"non-rosin" fluxes. You can use OA fluxes if you follow whats written in the
spec. In fact, the first method called out in the spec just simply requires
that you send a letter to your customer asking them for approval to use OA
flux. If they approve and put it it in writing, you're all set. We actually
did this on one program.

Otherwise, follow the testing called out in Appendix A using the IPC-B-36
boards. This test can get expensive. So you'll have to somehow justify the
expense.

You might want to tell your customer to specifiy something else instead of
this cancelled spec. I also understand the mentality that you'll run into
when asking the customer this question. The answers will be typically,
"We've always done it that way."

To answer your final question, the answer is, "It makes no difference." Just
as long as you follow the spec.

Bill Kasprzak
Moog Inc.

> -----Original Message-----
> From: Stephen R. Gregory [SMTP:[log in to unmask]]
> Sent: Friday, June 16, 2000 3:34 PM
> To:   [log in to unmask]
> Subject:      [TN] Generic question about Flux types...
>
> Hi ya'll!!
>
> I gotta generic question about flux types. We do quite a few boards here
> that
> still call out that the assembly is to be built to MIL-STD-2000 specs, and
> as
> has always been here, RMA flux is always used. My question is, what is the
> REAL reason to use an RMA?
>
> I've been under the impression that because a RMA is not as active as an
> OA,
> any residues that might be left behind from the RMA wouldn't be as
> harmfull
> as OA residues would be. But if you always ensure that you clean your
> boards
> thoroughly, what difference does it make whether you use an RMA or an OA?
>
> -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 Keach Sasamori at [log in to unmask] or
> 847-509-9700 ext.5315
> ##############################################################

##############################################################
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 Keach Sasamori at [log in to unmask] or
847-509-9700 ext.5315
##############################################################