Do you have to glaze clay before you use it?

What type of Clay/Glaze should i use to make oven safe ceramic baking dishes?

• hello! I am trying to make a set of oven safe ceramic baking dishes (casserole dishes) and i was wondering if there was a certian clay body i needed to use or if a Cone 6 Buff clay would work. i have heard of people using teracotta but im not a fan of that since you cant put glazes over cone 4 on them. that leads me to my next question; do i need to use a high-fire Glaze (cone 9-10) or is cone 6 acceptable? and if so does anyone have any recipes they would like to share? thanks in advance!!!!

• Answer:

  I know of 3 categories of oven safe casseroles Regular fired ceramics - cone 6 would fit here - can go in an oven but thermal shock can explode start with a cold oven do not shock with cold a cold counter when removing from oven I tied making a tagine it lasted 15 seconds before exploding. Low fire - Still porous - I haven't used much of this I tried sealing a piece with cooking oil that was fired to cone 05 but the piece set off the smoke detector in the kitchen Flam-ware - often cone 10 vitrified clay that can go on a gas flame this has so much iron should not go in the microwave what I made sagged in the kiln I am still learning. Here is a search http://ceramicartsdaily.org/ceramic-arts-daily-site-search/?cx=001510309991982260494%3Afn9s4gctyhs&cof=FORID%3A9&ie=UTF-8&q=oven+safe&siteurl=ceramicartsdaily.org%2Fcategory%2Fceramic-art-and-artists%2Fceramic-sculpture%2F Warning this is potters talking among potters. The disagreements are the discussion. What is still discussed is what potters are saying what they will use for themselves A number of people will only make ovenware for themselves and friends because of the liability.