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IndustryArena Forum > Hobby Projects > Steam and Stirling Engines > low friction and low temp packing question
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  1. #1
    Join Date
    Nov 2004
    Posts
    202

    Smile low friction and low temp packing question

    I have got to set up with a display engine that will run on low pressure air.

    Pressure will be less than 5 psi so I am looking for a packing material that has low friction, but still has reasonably low leakage.
    Cheap is good too.

    Any suggestions?

    Thanks,
    Bob B.

  2. #2
    Join Date
    Oct 2005
    Posts
    2392
    Delrin (polyacetal) would be my choice for a small air engine. Besides being good for highish temps (>100'C high for plastic) it is springy and allowing for that can be made into its own seal that doesn't need lube. Its very slippery on polished metal.

    Something like a cupped piston would work fine as the cupped part could be thin walled and the springyness of the material (maybe compined with the air pressure) would make it a good seal, without the drag of orings or other seals. Its a plastic commonly used in small pump and valve type devices because of those properties.

  3. #3
    Join Date
    Nov 2004
    Posts
    202
    Quote Originally Posted by RomanLini View Post
    Delrin (polyacetal) would be my choice for a small air engine.

    Thank you,

    Thanks sounds like exactly what I'm looking for.
    I have already located a source and will order some tomorrow.
    (Today is a Holiday here.)
    Cheers,
    Bob B.

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