O Ring material choice

[Tony MartyrParticipant @tonymartyr14488]

I am building a Beam Engine which is using O rings rather than graphite stuffing for the piston seal and those for the valve stem. The best supplier site offers rings of the correct size but with a choice of material which includes: nitrile, fluorosilicone, neoprene, polyurethane, silicone and viton. Which should I use for a low friction steam engine?

Tony

[Tony MartyrParticipant @tonymartyr14488]

[JasonBModerator @jasonb]

I have silicon on the traction engine in my avitar both for the piston and all glands but on my larger stationary engines I use Vitron on the piston. You will really need to lap or at the least hone the bore so it does not abrade the ring.

J

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