terrim8 Posted December 29, 2016 Report Share Posted December 29, 2016 I just recycled some Plainsman H 550 and was planning to use it for a cone 9/10 soda firing. When I was mixing it up before putting back on a bat to dry, I added more kaolin and feldspar - the idea being to make it a bit more like porcelain. It throws very nicely but I wonder if I threw the chemistry off- i.e. not safe to fire at cone 9/10 in a soda kiln? Link to comment Share on other sites More sharing options...
Mark C. Posted December 29, 2016 Report Share Posted December 29, 2016 I suggest testing it first now that you changed the body. Link to comment Share on other sites More sharing options...
terrim8 Posted December 29, 2016 Author Report Share Posted December 29, 2016 Ok- I was thinking that- c'est la vie! Link to comment Share on other sites More sharing options...
glazenerd Posted December 29, 2016 Report Share Posted December 29, 2016 The EPK will take the heat: good choice for fine particle substitution by the way. Porcelain bodies have 15-20% more flux in the body as compared to stoneware. You have to make a subjective assessment if the feldspar was proportionate or excessive. Testing would be the only way to confirm. Keep a record of what you add so in the future: then you will have a frame of reference. Nerd Link to comment Share on other sites More sharing options...
Callie Beller Diesel Posted December 30, 2016 Report Share Posted December 30, 2016 Yes, you threw the chemistry off, but by how much we'll see next weekend... Shouldn't be catastrophic in any case. Stoneware looks nicer in salt/soda than porcelain, imo. 550 and 555 both take the heat and the atmosphere reasonably nicely. Link to comment Share on other sites More sharing options...
terrim8 Posted December 30, 2016 Author Report Share Posted December 30, 2016 Ah ha! You caught me! I was trying to ask under the radar. You're supposed to be busy with the holidays & not reading this..... I made 3 small pitchers out of the 550 recycle with xtra kaolin & feldspar, then about 5 mugs out of H550 recycle/H440 mix. It isn't much but i'm trying to get to at least half a kiln load, but I might be there even without this stuff. I have a tiny bit of 440 left - after that its over as the store is closed! Link to comment Share on other sites More sharing options...
Callie Beller Diesel Posted December 30, 2016 Report Share Posted December 30, 2016 Hahahaha! I have to escape my crazy relatives somehow! It's going to be fine. Stop worrying. Link to comment Share on other sites More sharing options...
Min Posted December 30, 2016 Report Share Posted December 30, 2016 They will be the best pots ever and you'll spend an eternity trying to replicate them. psst Callie, I think I've seen your crazy relatives, they are over here visiting me Link to comment Share on other sites More sharing options...
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