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Found 5 results

  1. @glazenerd I use a local South African white midrange stoneware clay which fires to cone 6. It is extremely short and I read that adding a 50/50 ball clay to bentonite mix will improve the plasticity. They recommend to add 50g to a kilogram of clay. Will this influence the cone my clay fires to? At first I thought it was short because it was freshly made, but I'm 6 months down the line and it's still short. It even cracks when I wedge and it's not dry. I think it might have neph sye in it because if I wedge normally it cracks like crazy, but when I stack and slam it becomes pudding like.
  2. Hi all, I'm based up in Finland and we have a lot of very clean local clay deposits. It's grey and fires to a dark red brown at the top end of it's range which I would guess is around 1100C looking at the glow. (the test we did was in a self built wood downdraft kiln without any cones or thermocouple. It started to boil and melt) There was a brick works on the site where I got the clay up until the '50's, so I know the clay is usable in some form or another. There is a LOT of clay around here, I guess as a result of glaciation? I dug a heap of clay about 15 years ago and it's been wrapped
  3. I'm working with a clay that has a tendency to flop with little warning. From what little I know this can be a problem with plastic clay bodies holding more water than more forgiving, less plastic bodies. So with this in mind I'm looking at making adjustments but I'm getting conflicting information on what some accepted water content values are. Plainsman P700 has a % water of 23.5 - 24.5 Plainsman describes P700 as "our most vitreous cone 10 white body, it is the closest thing we have to a true translucent porcelain body. It is a mix of 50% Grolleg kaolin with feldspar and sili
  4. Is there any scientific way of measure the plasticity and tell it in numbers ? I know the easy way by rolling out a coil and wrap around the fingers to check the plasticity in no time but I wanted to know is there any way that I can measure it and keep noted so that it can be a reference is future ...
  5. Introduction of SAS Formulation - hypothesis The industry standard has been formulation based on particle size distribution (PSD), which includes density packing. The Zameck article proposed formulation based on the PSD principle; which included emphasis on density packing. However, particle size is a measurement that only determines the plane (face) of a particle, but does not include the depth. A sugar cube represents a perfectly square particle: which has the same plane and depth equal. Clays however can have the same particle size on the face, but vary widely in depth. So a large grain
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