Hi Stein -
There are a number of water soluble, acid fluxes that you could use for
your tinning operation for several manufacturers. I have seen the Superior
30 work well in several applications. I am surprised that the ESA
specification (this is one spec I have never seen) allows the use of a acid
flux in place of a RMA, especially for space applications. Whatever acid
flux you do choose I would suggest you run some cleanliness tests to assure
yourself that your tinning process does not leave a  residue on the
components that could lead to corrosion. Good Luck.


Dave Hillman
Rockwell Collins
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[log in to unmask] on 09/17/97 06:50:40 AM

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Subject:  [TECHNET] Pretinning - Flux




     Technetters,
     I have some problems pretinning some components stored for 5 years.
     The components shall be used in space equipment and according to
     ESA-PSS-01-708 we can use rosin based flux (RMA) for pretinning. If
     RMA flux are inadequate, corrosive water-soluble acid flux can be
     used.
     For our components RMA flux does not do the trick.
     1) Does anyone know a good method that can be used?
     2) Does anyone know suppliers of corrosive water-soluble acid fluxes?
     3) We have heard of a flux type called SUPERIOR 30. Can anyone tell me
        about suppliers of this flux?
     Thanks,
     Stein Davidsen
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