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OK... not sure where to start. I have purchased a blunger to mix 30 gallons of slip and hopefully mix a 55 gallon drum with it in the future. Mainly the goal was to be able to reclaim efficiently. I was also hoping to reduce the material cost of the casting slip. From what I have read some people imply the savings could be 1/2 the cost of pre mixed casting slip. Currently standard ceramics cone 6 stoneware casting slip is reasonable and if it is purchased in quantity the price is hard to beat. As an example: On a 275 gallon tote it's about 50.00 more to buy it ready to use. The problem with Standards cone 6 is that you really have no idea whats in it and you have little control of it's characteristics. Their cone 6 has worked well for me so far, but It could be a little better for the detailed molds I'm using. I also have used and like both types of their porcelain. These are all around 13-14% shrink and less than 2% absorption. The shrink rate is important to me, it's very close to other clays that I use. I'm surprised the shrink rate is not ball parked in many of the slip recipes that I have seen. I have a couple of recipes to try in the mid fire range. cone 7 slip Hensley/ Polseno from Andrew Martin's book....costs about the same as the pre mixed Cone 6 Andrew Martin's white porcelain... This would be about half the cost of the pre made porcelain. Would these recipes be a good starting point? Some of the ingredients like frits are pricy. I'm sure other people cringe at the thought of buying a bunch of raw materials that may end up sitting on a shelf. Are there some must have starting point ingredients? Are there any recipes for a cone six stoneware that would come in a 50% savings?
Hi all, My first post so be gentle. I have been a full time potter for about 20 years but up to now all of my work has been mostly wheel based. I am now working on a new range that will be a combination of wheel thrown and slip cast pieces. Up to now I have bought small quantities of pre made slip to just test things out. I will soon need to scale this up so need to decide if I should continue to buy slip in the liquid form or should I begin to buy the powdered clay and a blunger to start producing my own slip. I have talked to a few people and have arguments from both sides. Some say only a hobbyist would buy the liquid form others saying the savings are not worth the hassle of making it yourself. Initially I am talking about producing maybe 200-250 pieces a week this way but this will probably increase as more cast pieces are added to the range. So, any thoughts as to which method is more practicle/cost efficent/easier etc Would appreciate any input Thanks Thomas