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Porcelain slip casting recipe

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I think I have two in an my old clay mixing book-Its been 35 years since I have used these-not sure on thin strength .These are all cone 8-10

All old school stuff here



casting porcelian

spar 25

epk 40

flint 25

ball clay 10

+sodium silicate 1/4 of 1% or 1/2 tsp

strain 6-8 times-60-80 mesh screen


Pats casting porc slip

EPK 2.5 lbs

ball clay 2.5 lbs

silica 2.5lbs

spar 2.5 lbs


HSU casting porc slip

3 gal.

EPK 25 3405

Ball clay #4 25 3405

Feldspar 25 3405

Silica 25 3405

Sodium Silicate 34

Soda Ash 34

12 lbs.

Add deflocculants to water 1st

4 lbs H20 for 10 lbs. clay


when I had a slip casting business for 12 years we used darvon instead of sodium silicate to deflocculate it works better-we cast 40,000+ candle lamps

and gave up on soda ash as it hard on the plaster molds over time

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