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topic 10687

Dichromate seal temperature


I would like to know if the temperature of dichromate seal really has to be 194-212 degrees as it states in some specs. I work in an anodizing shop currently trying to become NADCAP certified,but the temp required to work to these specs are a concern. Our current temp is about 170 which seems to work fine and passes all tests. Is there away around this and still comply to these specifications? Any input would be greatly appreciated.


Steven Pennett
- Natick, Mass

First of two simultaneous responses2001

Steven, to answer your question, no there is no getting around the specification requirements. NADCAP was formed and supported by several leaders in the industry. Its sole purpose was to maintain high quality and consistency through the industry. However, depending on the specification, the customer is able to specify operations "equivalent to" the desired specification.

Best of Luck.

Ira Donovan, M.S.F.
Kansas City, Missouri

Second of two simultaneous responses2001

The higher temp gives a better seal. There is no way around it if you have to certify to the spec. If the spec is only a reference then the customer might give you a waiver for his use only. That is highly unlikely since it does not serve any purpose for him to do it. Why should he accept an adequate seal when he can have a good seal?

The higher temp requires a little more electricity, a little more DI water and a little more exhaust, than the 175. It is not really that big a deal to comply with the spec.

James Watts
- Navarre, Florida

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