Hi Cecilia,

> I need some help on the following topic.
> Is there any information available on using water soluble flux and paste
> in the military/defence industry? 
> 
        You can check IPC-HDBK-001 for general information on soldering.
        ANSI/J-STD-004 covers the requirements for soldering fluxes.
        For the US Military, MIL-F-14256F, which was cancelled, covers
fluxes.
        ANSI/J-STD-001B covers the requirements for Soldered Electrical
Assemblies
        For the US Military, MIL-STD-2000A, and MIL-S-45743E, both cancelled
without replacement, covered soldering).

> Does anyone have experience with this kind of flux system for military
> applications?
> 
        I haven't been around long but we are required to use what the
customer specified in the original order which is usually RMA flux for us. 

> How does the residues from water soluble flux affect the reliability of
> the product?
> 
        Others with more experience could give you a better picture of
reliability issues.
        Residues on the board shouldn't be ionic otherwise a short could
develop between pins/connectors over time.
        Nonionic residues can be a trap for ionic ones. Our customers don't
like to see dirty boards and neither do we.

        Alot of Military products I've seen require the boards to be
conformally coated and so the boards have to be clean very well after
soldering.

        Hans

Air Force Material Command - We keep them flying!
~~~~~~~~
Hans M. Hinners                                 WR-ALC/LYPME Bldg. 640
Materials Engineer                                      380 Second Street,
Suite 104
Manufacturing Eng. Sec.                         Robins AFB GA 31098-1638
912-926-1970 (Voice) 468 - 1970 (DSN)   912-926-7974 (Fax)
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> Cecilia Alkhagen
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