any of your high Pb possibly not going survive high vibration environment
(unless it is very low profile and large area contacts).  you might need
secondary support.  Press fit also not very good for high vib... unless
your mech eng group root out all the resonance... (never know when you
installed into the box, and start running on what kind of road, etc.
etc.).  depend upon what you intend to solder (250C, not many chip goes
that high if it is continuous, even it is 10% user life... you are out
there.  don't be a penny pinch... if I were you...). life support or
mission critical always need redundancy = don't drop on my head, unless it
is one shot deal (boom, it is gone type).  go for the safe bet rather than
live on the bleeding edge.  my 1.6 cents (I am old with fainted heart).
                     jk

> Cost is not a primary concern(to be spoken like a true government
> contractor) ;-D
>
> The final product is considered Life Support/Mission Critical and failure
> is not acceptable.
> This design however is pushing the limit of what I consider solderable. I
> have recommended
> We review a press-fit for production on it but and getting pushback from
> the Mech Eng.
>
> Jeff
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
> Sent: Wednesday, April 01, 2015 12:59 PM
> To: [log in to unmask]
> Subject: Re: [TN] HIGH Temperature Solder
>
> come on, Jeff, you can always go after Au-Sn...
>                   jk;-)
>> Hi Jeff - here are a couple of other choices:
>>
>> 10Sn88Pb2Ag
>>
>>
>>
>> 1Sn97.5Pb1.5Ag
>>
>>
>>
>> 97Pb3Ag
>>
>>
>> Nothing wrong with you 90Pb10Sn either. Make sure you select a flux core
>> that has good thermal stability as your soldering temperatures are much
>> hotter than what you deal with when using the Sn63Pb37 alloy. Also
>> consider
>> what the cleaning (or not cleaning) issues you may have to deal with.
>>
>>
>> Dave Hillman
>>
>> Rockwell Collins
>>
>> [log in to unmask]
>>
>> On Wed, Apr 1, 2015 at 9:20 AM, McGlaughlin, Jeffrey A <
>> [log in to unmask]> wrote:
>>
>>> I need to spec a high temperature wire solder for hand soldering. I
>>> need
>>> to have a solidus of greater than 250 degrees C. Is 90Pb10Sn my
>>> best/only
>>> choice or is there something else I should look at?
>>>
>>> Jeffrey McGlaughlin, C.I.D.
>>> Engineering Designer
>>> Avionics Systems & Tech Refersh
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