Hello, I'm new to this newsgroup technology but love all the info! I make plant pots and waterfountains but have had two incidences of the pot 'sweating' from the base. I use a cone 6 plainsman white clay, and a combination of commercial and studio made glazes. Any insights on where to begin looking to determine the problem? (glaze? base thickness? firing method?) Thanks for your help! JLW
The most common reason for pots sweating is clay that is not sufficiently vitrified. For stoneware, you want the absorption rate in the 2-3 percent range. A good non-crazed glaze can help to prevent sweating, but even absent glaze a well vitrified stoneware should not sweat.
deg
I agree with deg. Are you firing with cones or a controller? Try upping the firing temp. a degree or ten to get the body denser.
Steve Bath UK
In article , Dewitt writes
HI Janet, I am too new at this to be much help on correcting the sweating problem, but wanted to tell you that I have been an avid gardener all of my life and have yet to come across a plant pot that DOESN'T sweat around the bottom. I always assumed they were purposely made that way as plant roots need to be able to breathe. That's why most gardeners recommend unglazed terra cotta pots. Heck, sounds like yours are doing what they're supposed to!
As I look over the posts, I agree with all. You certainly want the clay vitrified so it won't sweat (leak through capillary action) also, perhaps we need to look at the fact the sweat comes two different temperatures meeting and producing condensation. The first temp being the stuff inside the pot whether it is water or dirt. The second temp would be the outside temperature. Condensation will not be corrected by firing to higher cone. Steve in Tampa, FL.
Thanks for thoughts! I will up the temperature some. It's odd that only two (that I'm aware) of ... maybe 100.. seem to sweat. It did seem that one of the pots I kept had moisture underneath at first, but then it went away, making me think it was just my imagination. Perhaps the theory of the temperatures is accurate. I'll leave the water sit room and water are the same and see if it continues to sweat. Another problem - my original message was the first time I ever posted to a news group. Since last night, I've had over 200 messages with viruses come in. (virus scanner caught them) Could this be related to whatever I've done newsgroup-wise? janet
In article , Janet Unruh writes
Virus and spam hits are related to your Internet activity, though which sort I am not sure. I am active on email and occasionally on this NG and have also had an awful lot of crap head towards my inbox. I now clean up my mailbox on the server before downloading. saves a lot of hassle.
Many newsgroup posters use a dummy Email address in the header, and show their true address in "munged" form in the signature. The idea is to make it readable by a human, but not via a machine running a simple algorithm such as searching for "@" and ".com". This keeps automated name harvesting programs from extracting your Email address and selling it to the spammers.
Your news reader should allow you to provide any header Email address you choose. It's possible that some news servers require a valid one, but I think that is not common.
Bob Masta dqatechATdaqartaDOTcom D A Q A R T A Data AcQuisition And Real-Time Analysis
Hmmmm... same thing happened to me. I used an email address I hardly ever check in my set up for news groups. I posted my first ever yesterday. There were 83 new messages in that box this morning. I stopped it and running anti virus on it as I'm writing this. I also went in to set up and put in a bogus email name. Lesson learned quickly. :D
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