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plating, anodizing, & finishing Q&As since 1989




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Hardcoat as a Dynamic Seal Surface

September 30, 2008

I plan on using hard anodize as a seal surface (mates with a lip seal on a rotary joint to retain low pressure lubricating grease.) Can I expect any wear/leakage issues with the hard anodize

Justin Smith
product designer - Bismarck, North Dakota, USA

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October 1, 2008

It should work very well, but you may want to consider lapping it to be certain it is smooth.

Jeffrey Holmes, CEF
Spartanburg, South Carolina

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October 1, 2008

If the part is not flexed or mechanically abused in that area, it should work. (IE: the anodize is not damaged or cracked) This also assumes that there is not a thermal coefficient of expansion problem with dissimilar metals. Winters are cold in ND and summers can be really hot in the sun.

James Watts
- Navarre, Florida