Hi Brian
I was certain that QQS 571/MIL 14256 contained the phrase:
This specification applies to fluxes which are not generally removed.
On checking I see this is not the case. On the contrary, they both say
RMA contains active... and must be removed....
So those words must have been in one of their then contemporaries [DTD 599
BT249 and similar].
Oh well, I suppose by now better to have a garbled memory than none at all
:)
Regards
Mike
ü Please consider the environment before printing this e-mail-----Original
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From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
Sent: Wednesday, February 16, 2011 4:22 PM
To: [log in to unmask]
Subject: Re: [TN] RMA flux and IPA
For me, the short answer is don't! I'm sure the subject has been touched
upon many times already. As Mike says, all you are doing is diluting the
active components in the alcohol and letting them dry on again exactly
in the places where you want them least.
However, I disagree with Mike on one point and that is that RMA flux did
have to be cleaned off with specific solvents according to the 28 809
standards for military purposes. It was not permitted to use it as a no
clean flux. That having been said, many people did use it as a no clean
flux for non-military applications, with varying degrees of success.
Despite what many people think, these fluxes did contain halide
activators, although the quantity was limited.
In my opinion, if you need the utmost in reliability, you should do a
proper clean with RMA fluxes or use a suitably qualified no clean flux,
which will give you the reliability that you desire.
Brian
On 16/02/2011 17:17, Phillip Bavaro wrote:
> What happens when the RMA liquid flux used to hand solder thru hole
components
> is cleaned using an IPA bath and a brush? Most comnponents come out
bright and
> shiny but happens underneath the bodies? Ionic testing doesn't pick up
> anything. Thanks in advance.
>
> Phil
>
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