plastic plating fixture

[rmetzger]

Any good suggestions for a material (plastic) for a manifold for a plating fixture using the following:

1% potassium silver cyanide
1% potassium carbonate
in DI water
This solution comes out to a pH of about 14

Its use will be infrequent but it needs to last a number of rounds of parts. Also a good o-ring / gasket material suggestion for the seals would be appreciated.
thanks
Ron

 

[kenvlach]

I'm not clear on what you want.

Do you want a rack for holding parts? If so, unless only doing immersion plating, it must be metal for electrical conductivity. Except for contact points, racks are usually coated with a PVC plastisol which is then baked at about 400^oF. Maybe powder coating with polyethylene will work for such mild conditions.

I suggest that your solution pH is about 9, and operates at room temperature. Yes?

Almost any plastic will work for tanks & gaskets for a room temperature, slightly alkaline cyanide solution. Natural polypropylene is a common tank material.

But, when all else fails, read the instructions. What does your chemical supplier's product bulletin say?
Technic

http://www.technic.com/chm/silver.htm

MacDermid

http://www.macdermid.com/electronics/pdf/Sterling.pdf

Atotech (formerly M&T Harshaw)

http://www.atotech.com/start.php3?cl_my_id=843681