Chris Campbell Posted November 22, 2016 Report Share Posted November 22, 2016 Back are my lab people saying they want more dishes, sturdier hopefully since the ones I made cracked in firing up ... not the cooling. So ... they were increasing the temp at 7-13 F per minute to get to Cone 3. They are trying to simulate a house fire so I don't think there is anything going to change in the firing. I am thinking I need a groggier body in order to make a dish that will survive this?? Or ... is there a clay that behaves like a refractory and can take anything once it's fired? All ideas welcome. Link to comment Share on other sites More sharing options...
glazenerd Posted November 22, 2016 Report Share Posted November 22, 2016 Chris: You are looking more so towards a flameware body. Simple math tells me they are firing at 600F an hour up to peak. Grog yes, but you also need some pyrophyllte in addition. The COE expansion also needs to be lowered ..... Nerd Link to comment Share on other sites More sharing options...
Chris Campbell Posted November 22, 2016 Author Report Share Posted November 22, 2016 I am not going to start learning clay formulation for this one job ... especially since the measurements they want are down to tenths of an inch. I am hoping there is some store bought that will absorb this kind of shock. Now that I think of it, does much pottery survive a house fire?? Link to comment Share on other sites More sharing options...
Marcia Selsor Posted November 22, 2016 Report Share Posted November 22, 2016 Good question. Why don't you try a smooth raku clay. Armadillo makes one. Alligator clay has a smooth and a groggier terra cotta for ^2 possibly goes to 3. They are in baton Rouge. Marcia Link to comment Share on other sites More sharing options...
Chris Campbell Posted November 22, 2016 Author Report Share Posted November 22, 2016 That was a thought I had Marcia ... if I gave the clay enough grog it would have room to move and absorb the shock. It does not need to be smooth just precise. Link to comment Share on other sites More sharing options...
glazenerd Posted November 22, 2016 Report Share Posted November 22, 2016 When you get done experimenting, let me know Will give you the info to slurry down an existing body, and make some simple additions to shock proof it. Nerd Link to comment Share on other sites More sharing options...
bciskepottery Posted November 23, 2016 Report Share Posted November 23, 2016 I am not going to start learning clay formulation for this one job ... especially since the measurements they want are down to tenths of an inch. I am hoping there is some store bought that will absorb this kind of shock. Now that I think of it, does much pottery survive a house fire?? Standard offers two kitchenware (flameware) bodies -- 762 and 768. Might be worth checking out. Cones 9 and 6 to 10, though. Link to comment Share on other sites More sharing options...
glazenerd Posted November 23, 2016 Report Share Posted November 23, 2016 I would go with Bruce's recommendation/s. One word of caution: flameware bodies have much lower COE values as compared to stoneware bodies: including those that are grogged. Example: flameware (typical) 5.00 to 5.25 Stoneware: 5.65 to 6.00. You need to factor this in if glazes are going to be applied. Double check shrinkage information: shrinkage at cone 6 and then at cone 10: is not the same. Nerd Link to comment Share on other sites More sharing options...
alabama Posted November 23, 2016 Report Share Posted November 23, 2016 Heavy grogged earthenware should do it. One of mine survived a house fire. My friends house burned down around the pot! Link to comment Share on other sites More sharing options...
Chris Campbell Posted November 23, 2016 Author Report Share Posted November 23, 2016 Thanks so much to you all for the input. I will start more research so hopefully I will get a better outcome. Link to comment Share on other sites More sharing options...
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