[Clayart] durable outdoor planters

[sumi]

Here is how industry tests ceramic tiles for freeze/thaw resistance:

https://www.tcnatile.com/images/pdfs/LookAtFreezeThaw.pdf

Sumi
> Testing a piece in the freezer doesn't show what happens if the same 
> piece sits outside absorbing tiny amounts of water over long periods 
> of time. It's a good test for crazing, but not for outdoor durability.
>
> I teach my students the Three Rules of Pottery: 1. Test  2. I told you 
> to test.  3. I said, TEST, you idiot.
>
> Lis
>
> On 2022-05-12 9:29 a.m., W Seidl wrote:
>> Phyllis:
>> Aside and apart from all the advice you are being offered, my 
>> suggestion is to make a small version of what you choose as a 
>> planter. Say, 3 inches by 3 inches.  Glaze and fire as you normally 
>> would the larger piece.  Then take it and put it in the freezer for a 
>> couple days.  Take it out, let it thaw for a day, do it again.  A few 
>> freeze/thaw cycles will tell you everything you need to know, and you 
>> can "adjust" from there.
>>
>> Another thought.  If the inside bottom of your planter is flat (even 
>> with drainage/weep holes) you might consider slightly sloping that 
>> interior bottom toward the drain, to allow collected water to drain 
>> more efficiently.  I've burst jars that had only a quarter inch of 
>> water in the bottom when it froze. Surprising, but it happens. Water 
>> is powerful.
>>
>> Like one of us on the list was fond of saying: "...test, test, test...".
>>
>> Best,
>>
>> Wayne in Maine
>>
>> On 5/11/2022 12:31 PM, Phyllis Canupp wrote:
>>>   I have made several planters over the course of my pottery 
>>> passion. Some
>>> of them hold up to the winter (occasional freezing temperatures), 
>>> and some
>>> don't. I would love to be able to pinpoint what I am doing both 
>>> right and
>>> wrong because I would like to make some larger sized planters. But of
>>> course I want them to be able to withstand the occasional freezing
>>> temperatures that we get in Virginia. Does anyone have any 
>>> suggestions or
>>> tips for making these pots? I do both handbuilding and throwing but 
>>> I will
>>> probably make these planters from extruded coils. As always, thank 
>>> you in
>>> advance for your help.
>>> Phyllis Canupp
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