What really is Barnard Slip?

Monday 12th May 2014

It is a clay, a very non-plastic one. These are fired SHAB test bars of Barnard Slip going from insight-live.com/glossary/119">cone 04 (bottom) to cone 6 (top, where it is melting). Porosity is under 3% and the fired shrinkage above 15% from cone 1 upward (second from bottom). Drying shrinkage is 4% at 25% water (it is very non-plastic). The darkness of the fired color suggests higher MnO than our published chemistry shows (and also higher iron). The white areas on the lower temperature bars are soluble salts.

Since this is a fine particled material, it could likely be made plastic with a bentonite addition, likely 5% or more would be needed. Solubles could be precipitated using barium carbonate.

Pages that reference this post in the Digitalfire Reference Library:

Barnard Slip, SG 758, Firing Shrinkage, Ceramic Slip

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.