Lab testing a clay for its physical properties

Thursday 26th February 2015

SHAB test bars, an LDW tester for water content and a DFAC test disk about to be put into a drier. The SHAB (shrinkage-absorption) bars shrink during drying and firing, the length is measured at each stage. The LDW sample is weighed wet, dry and fired. The can prevents the inner portion of the DFAC disk from drying and this sets up stresses that cause it to crack. The nature of the cracking pattern and its magnitude are recorded as a Drying Factor. The numbers from all of these measurements are recorded in my account at Insight-live. It can present a complete physical properties report that calculates things like drying shrinkage, firing shrinkage, water content and LOI from these measured values.

Pages that reference this post in the Digitalfire Reference Library:

LDW LOI/Density/Water Content, DFAC Drying Factor, SHAB Shrinkage/Absorption Test, Digitalfire Insight-Live, Physical Testing, Clay, Materials

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