Got back from Catalunya. Barcelona was awesome, like always. I spent a nice week in the studio called El Torn Barcelona (http://www.eltornbarcelona.com). Martin Loew is a really cool guy to work with. Learned a lot. Thank you.
I can not recall who recommended me El Torn here but thank you for the tip. :)
Lets say you have to slipcast relatively large bowls. Top diameter (widest) is about 45 cm (18.3") and hight is about the same. Final walls (after firing) can not be thicker than 6 mm and the shape is relatively complicated (not just a nice upside-down arch).
Q: Is it better to use low, mid or high fire clay?
Or lets ask this way: will low fire white clay warp less than a mid- or high temp white clay or half porcelain.
Pieces will be glazed with what ever the clay temp requires (forget the glaze for now)
I am not is US but overacting civil servants and their hysteria fueled crazy ideas have bad habit crossing long distances, even oceans. Come to think of it, similar madness is happening in some parts of EU too.