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Selling Planters/jugs As Porcelain Bisque? Frowned Upon?

bisque porcelain fired surface rough slip cast planters sell shrink texture

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#1 jnapier



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Posted 24 April 2014 - 02:12 AM

Hi guys,


Quick questions about porcelain-

I'm making some small vessels from slip cast porcelain, and really loving the soft matte look they get after being fired to bisque (1000celsius). Unfortunately when I fire to 1200celsius to finish them they get a rough sandy feel to them (feels like nails on a chalkboard) and lose the subtlely of colors/shrink etc.


My main issue is the sandy surface and I'm wondering if there are any issues with selling little planters as bisque? Is this generally frowned upon? The bisque doesnt leak water as such but it kind of bleeds through a little in spots but i could make it thicker.


OR- would it be better using another sort of clay that doesnt warp/shrink/and doesnt have that same rough texture? If so can someone recommend any? Plain earthenware? I would ideally like to make foodsafe versions eventually too which requires glaze obviously.


Any help would be greatly appreciated,



#2 Babs


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Posted 24 April 2014 - 04:29 AM

Don't know the answers but I do know that when I use bisqued pots for myself arounfd the garden after a time, a number of years mind you, the pots start to flake and disintegrate. Takes a long time but....

My bisque was to teh same cone as you.

my clay was terracotta.

#3 williamt


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Posted 24 April 2014 - 03:58 PM

Why not try some white earthenware slip for casting. It will mature at cone 04 (about 1050 Celsius) and I believe maintain some of that satiny finish you like. Water will still evaporate through it, but the clay will be mature.

Your porcelain slip is not mature at the bisque temp and will be a little less sturdy.

You can't really get around shrinkage. Most clay shrinks 10 - 15% on maturation. That's a generality - whatever clay you use should have the mature shrink % listed.

Experiment, it's fun and what it's all about!
Lee Tucker
Black Kitty Pottery

Also tagged with one or more of these keywords: bisque, porcelain, fired, surface, rough, slip cast, planters, sell, shrink, texture

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