Comparing the brands of calcium carbonate

Tuesday 18th March 2014

A cone 6 GLFL test for melt flow to compare two calcium carbonates (they make up 27% of this glaze recipe that was designed to maximize their percentage). Notice the amount of bubbles (due to the high loss on ignition of the material). Different brand-names of the material obviously have slightly different chemistries so they exhibit different flow properties during firing.

Pages that reference this post in the Digitalfire Reference Library:

Calcium Carbonate, A Low Cost Tester of Glaze Melt Fluidity, Glaze Bubbles

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