Frostiness in electropolishing pharmaceutical fittings
We have had problems with electropolishing of stainless steel pharmaceutical fittings. Even with the same heat number, some come out fine, while others from the same batch come out frosty on the I.D..
What are the variable to watch for to make all the parts come out okay.
Specific gravity? How often change of acid bath? Voltage, amps, and times? Other suggestions?Robert Fill
Etching is usually due to excess water or insufficient current density. A first guess is that since the problem is on I.D.s, the cause is low current density.
Ted Mooney, P.E.
Pine Beach, New Jersey
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