RonMello Posted February 21, 2014 Report Share Posted February 21, 2014 I recently included a small piece of bmix cone 5 in a wood kiln firing to cone 11. It came out and looked fine. Is this normal? Link to comment Share on other sites More sharing options...
neilestrick Posted February 22, 2014 Report Share Posted February 22, 2014 Are you sure it was Bmix 5 and not regular Bmix or Bmix wood fire? Link to comment Share on other sites More sharing options...
RonMello Posted February 22, 2014 Author Report Share Posted February 22, 2014 Hi Neil, No, I'm sure it was 5. I made a dozen small salt shakers and they were all marked cone 5. (I mark each piece with the clay I use because I use several) I also use cone 10 and cone 10 for wood.. I actuallmade these before I hade the cone 10 in the studio.. Link to comment Share on other sites More sharing options...
neilestrick Posted February 22, 2014 Report Share Posted February 22, 2014 It seems odd if that's the case. Bmix 5 should vitrify at cone 5-6, so by 11 it should be having some issues. I'd run an absorption test of a bar fired at cone 5 and see just how tight it really is. How big was the piece? A very small little cup may not show slumping problems like a larger piece. Link to comment Share on other sites More sharing options...
Mark C. Posted February 22, 2014 Report Share Posted February 22, 2014 Maybe it was in a cooler spot in kiln?? Mark Link to comment Share on other sites More sharing options...
Biglou13 Posted February 24, 2014 Report Share Posted February 24, 2014 Helios (highwater) lists stats, 1%@ cone 7, >1 % @ cone ten. I've seen other "porcelain" based clays have similar small range of vitrification. Since the b-mix is a secret, No one knows, however mfgr's description indicate "porcelain like texture", maybe it has porcelain in it. I've heard of people complaints of cracking while drying, with this clay. To me, it sounds very similar to porcelaineous body issue. So is I think it is possible you fired your cone 5 clay to cone 10. And still have functional body. Maybe? But vitrification rules differ from range of absorption, to range of density. I've also read many commercial clays are designed to be under fired, to prevent slumping among other things. I know of people that fire cone 10 clays to the 6-7 range, the pieces are functional and don't leak, functional in practical sense..... I'm running some absorption tests on a few of these clays. Speculation to follow: The b miix body may have both porcelain and gold art in large percentages Non pocelain bodies would most likely have failed at plus 5 cones. Link to comment Share on other sites More sharing options...
DarrellVanDrooly Posted March 2, 2014 Report Share Posted March 2, 2014 Ive fired ^5 B-mix in a ^9 wood firing with no problems whatsoever so I don't see why it couldn't withstand a ^11 wood firing. Link to comment Share on other sites More sharing options...
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