Will it break/crack when firing ?

[Dalva88 0]

Hello,

I just finished modeling some clay for ceramics (it's called Faïence in french, which translates to earthenware in english ?)  and I would like to know if I should hollow it out more or if it might break/crack when firing ?

 

The object (which is a grenade) is about 1 to 1.5 inches thick, and the top isn't hollow at all. ( see it in picture  1 : the circled part is all full mass) 

 

I'm a beginner, bur I worked a long time on this and now I'm starting to panic because it's pretty dry and  I don't know  if I should have hollowed it out more or if after all this work it might break when firing.....

 

Thanks for your help.

[Mark C. 3,712]

less clay is safer in terms of cracking .thats a thick wall

either way it needs a slow firing and before fired it needs to be VERY DRY

I would put it in a warm dry place for as long as you can afford time wise

[neilestrick 3,330]

I wouldn't fire it in my kiln. Too great a chance of explosion, even if it's really dry. It will probably explode in a typical firing schedule, so it would need a very long, slow firing.

[liambesaw 1,550]

If it blows up in the kiln, at least it will have gone down doing what it loved.

 

[Mark C. 3,712]

In a few weeks  after drying I would put it in the oven at 200 degrees(this is under 212 water boiling point) for a night-next night 250  degrees  and so forth until it really dry .

Once it survives a 500 degree night in the oven I would say you are on the way-during firing the 800 mark is the next threshold but not will be a live grenade at that point.

[graybeard 29]

Hmm, I thought they were made to explode. all the ones I used did.

Looks great though! nice job!

graybeard