Classically activities used to go R RMA RA OA IA

In practice activities were something like this scale according to supplier
and type within supplier range:
R
  <-RMA->
           <--RA-->(SRA)>
              <--------- OA ---------->

with IA well over to the right of the page/screen. The OA and IA being
highly active and needing 100% removal, also the super active rosin
[although this was never an "official" designation, nor even admitted by
some suppliers!].

OA fluxes were water soluble and for this reason most people still tend to
equate water soluble fluxes with high activity.

This is not automatically the case these days, some water soluble fluxes can
have only the same activity as no cleans. They are just water soluble after
soldering instead of solvent soluble, but it's a reasonable assumption.

Regards

Mike Fenner

Applications Engineer, European Operations
Indium Corporation
 T: + 44 1908 580 400
M: + 44 7810 526 317
 F: + 44 1908 580 411
 E: [log in to unmask]
W: www.indium.com
Leadfree: www.Pb-Free.com



-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Phil Nutting
Sent: Wednesday, February 26, 2003 6:54 PM
To: [log in to unmask]
Subject: [TN] RA vs. RMA vs. OA flux


Can anyone define for me which flux is the most active?  There was a
discussion today around how the OA fluxes were not as good as the old RA or
RMA fluxes relative to being active and how well they "clean" a component
lead during the soldering process.  I used to swear by the old standby of
Kester 44 core and 1544 flux.  After working with OA fluxes I like the end
product of the OA fluxes better.  Yes the cleaning requirements are
different, but that is a separate discussion.

Thanks in advance for your comments.

Phil Nutting

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