UHMW or delrin for coating rod?

Discussion in 'Alternative Processes' started by gmikol, Jan 23, 2010.

  1. gmikol

    gmikol Member

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    Hi All--

    I didn't find anything with a search...

    Everyone seems to use glass for a coating rod, but I've got some UHMW polyethylene and some Delrin rod lying around. Is there any reason I shouldn't use either of these for coating? Both are non-porous and non-reactive, and fairly rigid.

    Any experience or advice??

    --Greg
     
  2. Photo Engineer

    Photo Engineer Subscriber

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    I would say either is OK, but try it and see.

    PE
     
  3. donbga

    donbga Member

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    When I used coating rods, I tried a plastic one and hated it. The plastic tends to drag compared to glass rods.
     
  4. Rick A

    Rick A Subscriber

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    I've never done any coating, however there is a major difference between glass, UHMW plastic, and Delrin. The difference is glass is microscopically porous, where the plastics are not, and actually slippery. I use both plastics for woodworking jigs and fixtures. I'm no chemist, so I couldn't tell the specifics, but both have an apparant self-lubricating property, that allows other materials to slide along them with relative ease,like they are lubed. That being said, the pores on glass give a cling factor the other materials dont have. So the only thing left to do is what Photo Engineer said, try it and see.

    Rick