Steve, that part number smacks of a PRC-DeSoto polysulphide. We use
PR1783-2 here which is a manganese dioxide cured polysulphide and is
again basically a fuel tank sealant (don't think it's mil released
though. That cures at room temp in 24hrs and we've found that we can
accelerate the cure at 55degC. We use it for staking and component
bonding too. Good adhesion, nice and flexible, just what the doctor
ordered.
Regards
Ian Fox
Lead Materials and Process Engineer
Aero Engine Controls
A Rolls-Royce plc and Goodrich Corporation Joint Venture
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: 11 February 2009 14:34
To: [log in to unmask]
Subject: [TN] Staking Question/Help...
Morning All!
Well, survived all the storms we had last night. Actually, it wasn't bad
in Tulsa as it was to the south and to the west of us.
They think there was a tornado that touched down in a city called Pawnee
to the west, one in Edmond to the south, and there were eight lives lost
in Lone Grove last night. Really early for tornado season here...
Anyways, we're building a board that has a requirement to stake some PTH
radial parts and they reference MIL-S-8802, Class B2 as the material to
be used for the staking. Our buyers purchased a 2-part material from
Bergdahl called PR-1440 Class B. So I got the datasheet and started
looking at how to use it, and discovered that the fastest that I can
cure it is 7-days at 250 F., or 14-days at room temperature. That really
puts a kink in our schedule...
I'm not very familiar with that spec, but what I can find is that most
everything I find that is listed and complies with it, is actually
aircraft fuel tank sealant. Why they want to use that is beyond me, but
that's what is on the drawing so that what we'll use.
I'm wondering if any of you know of anything that will cure quicker than
that and complies with the above spec? Any help is appreciated.
Steve
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