^6 vs ^10 clay?

Properly fired (i.e. cone 10 clay to cone 10 and cone 6 clay to cone

deg

Read a book. It will be faster than waiting for newsgroup replies. k

I'd like to ask a modified question: what is the lowest cone temp which gives good durability for objects intended for everyday use. And, with respect to durability, does the glaze temp also have to be as high?

I've been using only low fire Cone 04 clay and Cone 06 glazes and have found for table use, they chip easily. But I noticed also that the slip clay for casting I've been using can be fired from Cone 04 to Cone 5. If I were to fire to cone 5, would I still get durability with Cone 06 glazes, or do I need to use higher temp glazes as well?

Cone 3 is about the lowest that you can fire and get durable dinnerware, BUT the clay has to be formulated to vitrify properly at that temperature. There is no way that a clay can be formulated to be properly vitrified when fired anywhere in the range of cone 04 to cone

1. It probably will be underfired and porous at 04 and overfired and starting to slump at cone 5.

You might be able to bisque your work at cone 5 and then do a glaze firing at 06. Glaze application may be difficult because the clay won't be very porous after being fired to cone 5, but some commercial processes do bisque fire higher than the glaze firing and it works fine.

deg

On Sat, 20 Dec 2003 04:23:42 +0000, Dewitt wrote: ..

Thank you!