JoyB Posted September 3, 2012 Report Share Posted September 3, 2012 Hi everyone, Can anyone enlighten me as to which Silica is used in an Oil Spot recipe or any recipe stating Silica. I believe it could be either Quartz or Flint or ???? In the US do you favour one or the other? Many thanks Joy uk Link to comment Share on other sites More sharing options...
Denice Posted September 3, 2012 Report Share Posted September 3, 2012 Flint is an older term for silica, Older glaze formulas often will use the term flint while newer ones call it silica. Either way it's the same thing. Denice Link to comment Share on other sites More sharing options...
Guest JBaymore Posted September 3, 2012 Report Share Posted September 3, 2012 Usually in the US we use 325 mesh ground flint (in glazes) for "silica" , "quartz", or "flint". Get a typical analysis for your suppliers composition if you are using molecular calculation.... but for all intents and purposes.... it is all supplying just about 99.9% SiO2 in the melt. best, .......................john Link to comment Share on other sites More sharing options...
Mark C. Posted September 3, 2012 Report Share Posted September 3, 2012 I use silica that is ground to 325 mesh for my oil spot glaze- Its called flint or quartz in my old glaze books but really its silica I use 325 silica in all my glazes. Mark Link to comment Share on other sites More sharing options...
Marcia Selsor Posted September 3, 2012 Report Share Posted September 3, 2012 Generally the finer 325 mesh silica ,aka: flint, quartz is used for glazes and the courser 200 mesh silica is used as an additive on clays. Marcia Link to comment Share on other sites More sharing options...
Mark C. Posted September 3, 2012 Report Share Posted September 3, 2012 Also I have found that 200 mesh silica in a few glazes make for less flow and stiffer glaze. That is I have to fire hotter to achieve same result. I found this out the hard way. So now its all 325 mesh for me. Mark Link to comment Share on other sites More sharing options...
Guest JBaymore Posted September 3, 2012 Report Share Posted September 3, 2012 Also I have found that 200 mesh silica in a few glazes make for less flow and stiffer glaze. Yup. Or fire to the same cone over a much, much, much longer period. Along with the concepts of molecular composition, comes the sourcing of the raw materials. Particle size, shape, and distribution all impact the physical aspects of the melt. Particle type is the KEY the to actual Japanese Shino glaze at least as much as the composition of the rock. best, ...................john Link to comment Share on other sites More sharing options...
JoyB Posted September 3, 2012 Author Report Share Posted September 3, 2012 Many thanks to all you guys and gals for all your help. Best wishes Cheers Joy UK Link to comment Share on other sites More sharing options...
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