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What is the process of slip casting?


Slip casting is a method used to make the shape of a coffee cup, for example, without the use of heat. ... In slip casting, the slip is poured into a mold that removes some of the liquid from the slip near the mold wall. This occurs because the mold is porous and the liquid wicks into the pores by capillary action.

Pouring the slip into a mold

Once your slip reaches the consistency of a thick cream you then pour the slip slowly into the mold all the way to the top.  If you pour the slip to quickly into the mold you do not give it enough time to settle in and you may have to fill it a little more with slip. If this happens then it can create rings round the top of the mold. 

Pouring the slip out of the mold

Wait 10 to 25 minutes before you start to drain your mold. Depending on the size of the mold and the thickness you want your piece to be will determine how long to leave the slip in. If you are a beginner pourer it will be a trial and error until you get used to it. Good news in is that you can reclaim the greenware.

Taking greenware out of the mold

Once you have left the slip in the mold to the thickness you desire, you carefully separate the mold. At this point the greenware will be dry enough and loose so that you can carefully handle it with your bare hands. 

Trimming an​d Cleaning the Greenware

The final step in casting is the trimming and cleaning the seams on the greenware. When you take the greenware out the mold you will notice a seam that usually goes around the mold, there are special tools you can use to clean the seams off. Everyone has their own technique to cleaning there greenware. (I use a damp sponge and a cleaning tool)