A vitreous sculpture clay. Vitreous enough for functional ware!

Tuesday 15th May 2018

This is P5867, a chocolate brown burning super-plastic base clay (to which 20% coarse grog is added) matures at cone 6. Yet this body is common used at insight-live.com/glossary/125">cone 10R. The grog stabilizes the fired matrix enough that it stands up in the kiln. And it fires to a dense product that can withstand any weather. It does have a porosity of 4%, but that is coming from the grog. Several manufacturers around the world make bodies like this, some can have almost double the grog this one has. These two mugs employ engobes on the inside (a brown and a blue, applied at the leather hard stage - L3954N), enabling a smoother glaze surface.

Pages that reference this post in the Digitalfire Reference Library:

Outdoor Weather Resistant Ceramics, How can Craft Crank sculpture clay be so plastic and smooth with this much grog?, Vitrification

This post is one of thousands found in the Digitalfire Reference Database. Most are part of a timeline maintained by Tony Hansen. You can search that timeline on the home page of digitalfire.com.