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Using Buna-N o-rings as a trivet
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dp Brewing Company



Joined: 08 Jul 2013
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PostLink    Posted: Tue Feb 07, 2017 7:21 pm    Post subject: Using Buna-N o-rings as a trivet Reply with quote


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I'm still looking for something good to put under my pots for brewing. Anyone ever used Buna-N o-rings? I see I can get a 17" one pretty cheap on Amazon. Figured I use a 17" as my outside and buy a couple smaller ones to get to the center.

Anyone have any thoughts on that? or is it a dumb idea?

https://www.amazon.com/462-Buna-N-O-Ring-Durometer-Round/dp/B0051XYJA8/ref=as_li_ss_tl?s=industrial&ie=UTF8&qid=1486494234&sr=1-7&refinements=p_nominal_outside_diameter_string:17+inches&linkCode=ll1&tag=theelectricbrewery-20&linkId=f01a3debaf4e487c18a6209a0df10f05
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silverspoons



Joined: 21 Dec 2010
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Location: Webster NY


PostLink    Posted: Tue Feb 07, 2017 7:31 pm    Post subject: Reply with quote

HOW ARE YOU GOING TO USE THEM.. I'M CONFUSED

SILVERSPOONS
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dp Brewing Company



Joined: 08 Jul 2013
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PostLink    Posted: Tue Feb 07, 2017 7:44 pm    Post subject: Reply with quote

silverspoons wrote:
HOW ARE YOU GOING TO USE THEM.. I'M CONFUSED

SILVERSPOONS


Was planning on laying them out on the table and setting the pot on top of them.
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dp Brewing Company



Joined: 08 Jul 2013
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PostLink    Posted: Tue Feb 07, 2017 7:50 pm    Post subject: Reply with quote

They can handle heat up to 250 degrees. Figured they would give a small buffer under the pot.
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Ozarks Mountain Brew



Joined: 22 May 2013
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Location: The Ozark Mountains of Missouri


PostLink    Posted: Tue Feb 07, 2017 11:22 pm    Post subject: Reply with quote

my thoughts on my set up since the elements are very near the bottom Im thinking I could be losing some heat out the bottom so why not use a layer of reflectix and a 1" or 2" insulation board under, I have several layers on the outsides of my kettles and I could bring one down to cover up the board and make it seamless
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ParadiseBrew



Joined: 09 Dec 2014
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Location: paradise, ca


PostLink    Posted: Wed Feb 08, 2017 5:25 am    Post subject: Reply with quote

what are the pots going to sit on? if it's a metal table then you don't need to spend the money... just another thing to keep on your mind if you need to clean them, keep track of them etc.... if you are going to keep your pots on a wood table or something then i would just get a small sheet of the rubber stall mat from a local farm store and cut them to the right size with a saw. That way you can go a bit larger or exact size and the half sheet (4'X4') is cheep and black and just works. But if they are sitting on a metal table don't worry about!
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dp Brewing Company



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PostLink    Posted: Wed Feb 08, 2017 12:57 pm    Post subject: Reply with quote

ParadiseBrew wrote:
what are the pots going to sit on? if it's a metal table then you don't need to spend the money... just another thing to keep on your mind if you need to clean them, keep track of them etc.... if you are going to keep your pots on a wood table or something then i would just get a small sheet of the rubber stall mat from a local farm store and cut them to the right size with a saw. That way you can go a bit larger or exact size and the half sheet (4'X4') is cheep and black and just works. But if they are sitting on a metal table don't worry about!


Thanks for the reply. I thought about that but didn't know the amount of heat those pads could take. Last thing I want is them to melt to the bottom of my pot. This is on a wooden table. I also thought about those felt pads that lowe's sells. The thicker ones but then I thought back to about them not holding up to the heat well. Maybe I'll try the farm store pads and see what happens.
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dp Brewing Company



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PostLink    Posted: Wed Feb 08, 2017 1:41 pm    Post subject: Reply with quote

What got me to think about the Buna-n at first was the fact that I should replace all my keg lid o-rings soon. Figured I could throw a few under the kettle and see how it does.
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kal
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PostLink    Posted: Wed Feb 08, 2017 2:02 pm    Post subject: Reply with quote

The issue with materials like nitrile rubber (also known as Buna-N) and silicone is that they're fairly dense and do not work as well as an insulator as open-fibre materials, cork, etc.

When you boil you're pushing heat out for 60+ mins so it doesn't take long for the silicone or nitrile rubber to 'saturate' with heat and pass it through. Something like cork works considerably better.

If you're on a stainless table, you don't need anything. Though I do usually use 4 of these under my boil kettle:

http://www.theelectricbrewery.com/Large-cork-heat-mat

Kal

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dp Brewing Company



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PostLink    Posted: Wed Feb 08, 2017 2:59 pm    Post subject: Reply with quote

Thank you, that was the kind of info I was looking for.
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dp Brewing Company



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PostLink    Posted: Thu Feb 09, 2017 4:27 pm    Post subject: Reply with quote

I found these at Menards. Only $9 for four 12" squares. Looks to be about 3/8" thick maybe 1/2". I didn't measure. Seem to be about the right size for my pots. Don't cover the whole bottom but cover most.


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kal
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PostLink    Posted: Thu Feb 09, 2017 5:11 pm    Post subject: Reply with quote

Make sure the cork you're using is meant for heat. Some cork that may be dyed may 'cook' when you heat it. Those look like they may be for making bulletin boards or possibly even floor tiles? (Not sure).

Kal

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dp Brewing Company



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PostLink    Posted: Thu Feb 09, 2017 5:27 pm    Post subject: Reply with quote

Well darn, I thought I was in the clear. They are for bulletin boards. I just assumed if it was cork I was in the clear. You know what they say about assuming...
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kal
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PostLink    Posted: Thu Feb 09, 2017 5:33 pm    Post subject: Reply with quote

They may be fine, just giving you a heads up as you're using it for something that it was never intended for (high heat) which may have consequences you didn't think of / realize.

Kal

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dp Brewing Company



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PostLink    Posted: Thu Feb 09, 2017 5:42 pm    Post subject: Reply with quote

I appreciate the heads up! I may have to do some testing with old crappy pots.
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chastuck



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PostLink    Posted: Fri Feb 10, 2017 12:00 am    Post subject: Reply with quote

Have a look athis thread right near the bottom. I use rubber playground mats, which really work well for my Blichmann pots. http://www.theelectricbrewery.com/forum/viewtopic.php?t=28369&highlight=playground
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dp Brewing Company



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PostLink    Posted: Fri Feb 10, 2017 2:51 pm    Post subject: Reply with quote

I did a little test last night with just water. I was completely amazed how slow the bottom of the kettle is to heat up. After 30 minutes of heating up the HLT to 170 degrees (from 45 degrees) the bottom of the kettle was still 52 degrees. I moved the water over to the BK and the bottom of that kettle was instantly 114 degrees. It stayed that temp as I raised the water to 190 degrees.


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dp Brewing Company



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PostLink    Posted: Fri Feb 10, 2017 2:52 pm    Post subject: Reply with quote

oh, and the cork did fine for the short test I did. I'll have to do some more testing to be sure.
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kal
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PostLink    Posted: Fri Feb 10, 2017 3:02 pm    Post subject: Reply with quote

dp Brewing Company wrote:
I did a little test last night with just water. I was completely amazed how slow the bottom of the kettle is to heat up. After 30 minutes of heating up the HLT to 170 degrees (from 45 degrees) the bottom of the kettle was still 52 degrees.

Were you recirculating?

Kal

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dp Brewing Company



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PostLink    Posted: Fri Feb 10, 2017 3:07 pm    Post subject: Reply with quote

Nope, just heating up. Was mainly making sure the new element would work. I see where your going with that. Good point.
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