[Clayart] Clayart Digest, Vol 50, Issue 43

ronroy at ca.inter.net ronroy at ca.inter.net
Wed Feb 5 12:45:18 EST 2020

As usual, I agree with Michael. Using our minds in a creative way to  
design our experiments to suite our needs just makes sense.

Anything that combats the old misinformation will benefit us all by  
making our work more reliable. Our communal reputation needs looking  

Clayart gives us the opportunity to ask the questions that lead to  
better answers and better understanding.


Quoting Michael Wendt <mwendt at wendtpottery.com>:

> Hi Snail,
> I have a funny thought...
> usually, freezing happens from one side inward as an object cools,  
> proceeding at a pace controlled by how cold and windy it is..
> How about adding a 2" thick block of Styrofoam to one side of the  
> item you are testing?
> Rubber bands could secure it.
> This would result in the freezing progressing from a cold side to a  
> protected side.
> I agree that the cycle has to go from frozen to thawed and the back  
> to frozen many times.
> I don't know if it matters but it would match reality more closely,
> Fun discussion
> Michael Wendt
> ----- Original Message ----- From: "Snail Scott" <claywork at flying-snail.com>
> To: "Clayart international pottery discussion forum"  
> <clayart at lists.clayartworld.com>
> Sent: Tuesday, February 04, 2020 7:31 AM
> Subject: Re: [Clayart] Clayart Digest, Vol 50, Issue 43
>> On Feb 2, 2020, at 11:04 AM, ronroy at ca.inter.net wrote:
>> A freeze thaw test could be done every day to see what would work?
> Yep, I do this; just have to stick to a daily routine: Pull out each  
> evening to thaw; return it to the freezer every morning. Or  
> vice-versa.
> The sample should reflect actual intended use: thickness,  
> glazed/not-glazed, etc.  Boil (or soak for a few days), then seal in  
> a ziplock freezer bag. No benefit to wiping it off; just bag it up.  
> Freeze and thaw daily for months.
> Staying frozen for a long time is no different than being frozen  
> briefly just once. Clay is stressed anew every time it re-freezes,  
> and stress that does no visible damage after one cycle may still  
> open up cracks that admit more water, then freeze and split further  
> each time until serious damage accrues. Valid test results require a  
> repeated cycle of freezing.
> We are trying to simulate years and years of exposure, so as far as  
> I am concerned, there is no such thing as too much testing.
> -Snail

Ron Roy
ronroy at ca.inter.net
Web page ronroy.net

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