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Gasket material


Jimmidaboot

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Silicone might be the only material for that application. Natural rubber is degraded by heat and the corrosive nature of alcohol vapour. Just lay down a bead of Permatex ULTRA COPPER, allow it to set up a bit, then join the two surfaces.

Great work, and I applaud your skill at coppersmithing!

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I was wondering about EPDM material? Do you or anyone else on here know anything about it? The silicone would certainly be convenient, but I will need something to take up some space, as the mating surfaces are not flush and smooth. Thank you for the kind words on smithing! You're too kind.

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Suggest you check out the following link

http://adiforums.com/index.php?showtopic=2522&hl=neoprene&st=0

There was some discussion about gasket material.

I built my own still and had the same problem with uneven flanges

I use "O" section closed cell neoprene. Depending on diameter it will seal some very uneven flanges

Pete

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Hey Jimmy... Im sure there is someone in your area that cuts gaskets... The guys I use here in Albuquerque can make any shape gasket out of any material ... I have them make flange gaskets from silicone and EPDM that are 1/4 to 1/2" thick.... They are GPS supply in Albuquerque

http://gpssupplyco.com ....

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EPDM is generally considered the material of choice, it is highly resistant to alcohol. HOWEVER, I suspect that it is less suitable for high-proof, high-temperature application than people realize. We have it located in part of our column. Over time, we have noted that the EPDM has loss flexibility. This could be due to a further vulcanization (it is a form of rubber). Which concerns us, because if any chemistry is going on, there is also a possibility of leaching. The dienes in EPDM crosslink in the presence of sulphur during normal vulcanization. We have thought to replace some of the gaskets with high-temperature silicone gaskets. Note that the ethanol resistivity of silicone rubbers varies depending on the type. Donutboy, if your EPDM guru wants to pipe in, that would be great. I don't think there is any problem using it in lower temperature or lower proof applications, but I am a little suspect about in the column or stillhead.

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