Anna M

Hi Babs, I fired to a hot cone6, (witness cone also showed cone 7 half bent) the clay had a firing range of 1180-1250 degrees, and I used a range of glazes amaco cone 5-6 glazes, and some terra colour which are 1200-1280 degrees. the clay company are sending me a replacement bag, they think it should be vitrified at the temp I fired at. however I’m just wondering all the pottery I have that leaks can I try to go higher - maybe by 10degrees to try find vitrification point. Can I put amaco cone 6 glazes to cone 7? thanks so much for your help

I have a number of pieces which leak. So I need to increase firing temp for this clay. The bowls and cups I tested for leaking (I put water in them overnight) can I put these items back into the kiln and refire at higher temp? Or because they have had water in them they will explode? Thanks

Will try this for the next firing - thanks nielestrick

Thanks for the reply Bill!

Hi Potters, I recently purchased a new kiln with a ventmaster, downdraft. I fire to cone 6. I am a little bit confused as I have been advised to turn off the vent-master at approx 800 degrees. Everything I have read talks about leaving the vent on until the top temp has been reached (with the option of vent kept on during cooling - which I wont do fear of glazes cooling too fast). I cant seem to find anything about turning off the vent before top temp reached. Does anyone know what the reason would be to turn off vent at 800 degrees? Will it effect the glaze if I keep it on? Thanks

I am about to purchase my first kiln, a Naberthem Top 80, and need some advice about the safest way to vent. The only space I have for a kiln it is in my garage which is connected to my house. The garage has a double garage roll up door, back door, and a window. In the garage is also my laundry (washing machine and dryer). Pottery equipment as well as my Car (however can leave car outside the house when I am firing). Also to note there is a 1-1.5cm gap under the door connecting to my main house. The supplier suggests opening windows is enough ventilation, the operating manual suggests a stainless steel pipe system venting upwards through the wall to outside? I want it as safe as possible (as well as keeping my laundry equipment from rusting out). I have attached a wee map of the area, showing windows and doors. I am in need of advice on how I do the ventilation please? Any suggestions of the best location in the garage to place my kiln? If I do install the steel vent can I work in the garage while the kiln is firing? If anyone has feedback on the Nabertherm Kilns would love to know (I haven't pressed the purchase button yet..). This one has a B400 controller. Thank you! Anna Untitled presentation (1).pdf