Ivan

  We used a wax type for dross reducing agents, they really worked great,
but the wave solder machine vendor claimed about a potential failure at
solder pump system, the failure mechanism were based on liquid wax to mix
with powder dross at pump helices and force the motor. In fact, at
preventive maintenance disassembly the pump helices were covered by a kind
of cream that were different from the powder dross that normally happens
before we used the wax. After we stoped the use of the wax, the vendor said
that we were using too much wax on the solder pot.
  I still dont know if the wax isn't good or we used too much ...
  Today we use solder alloy prepared inside inert atmosphere ( Nitrogen )
this process reduces the oxid formation.

Jorge Dourado de Santana
Maintenance / Process Engr
Microtec - Brazil




> -----Original Message-----
> From: Ivan Barrios [SMTP:[log in to unmask]]
> Sent: 13 de Dezembro de 1999 14:03
> To:   [log in to unmask]
> Subject:      [TN] Dross Reducing agent
>
> What is an industry standard (or current experience)  on dross produced
> (relationship of adding new solder versus removing dross for, i.e. for
> every
> pound of solder added we remove X amount of dross kind of deal)
> Also, has anybody had any experience with using dross reducing agents
> (Kind of
> like a detergent to sprinkle at removal of dross) to separate Good solder
> form
> the oxides. I have acompany (no names ) that is trying to sell me on this
> stuff
> and I would like to hear past experiences with this type of additives.
> Any and all replies will be greatly appreciated
>
> Ivan Barrios
>
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