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Showing posts with the label water additives

A "Booming Economy" and the Local Water Supply

Andersen Design has been mixing casting slip at our present location since 1958. I have personally been mixing it for decades but I recently ran up against an unprecedented problem, which has persisted through three batches from three sources, the last being made from fresh raw materials, keeping adjustments for viscosity at a minimum. When mixing clay slip the amount of water content is crucial. Our specific gravity target range is 176-180. The lowest We ever go is 171 and that is for small items only. The viscosity, or fluidity of the slip has to be such that it easily pours in an out of the mold. I do not usually measure that because it is very apparent, The higher the viscosity the thicker the slip and the less flowing qualities it has. If the water content is within range but the viscosity is high, I add a deflocculant and that brings the viscosity down. This is the way it has been working for years until now when we are working on a small but potentially large wholesale or