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JoyB

oil spot glaze

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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

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Guest JBaymore

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

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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

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Guest JBaymore

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

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