•The secret to cool bodies and glazes is a lot of testing.
•The secret to know what to test is material and chemistry knowledge.
•The secret to learning from testing is documentation.
•The place to test, do the chemistry and document is an account at https://insight-live.com
•The place to get the knowledge is https://digitalfire.com

Sign-up at https://insight-live.com today.

Sulfates, Sulphates


Sodium, potassium, magnesium sulfates can be found in many clays. These are soluble and often dealt with by the addition of barium carbonate to precipitate them. However, while the reaction that occurs produces insoluble chlorides of sodium, potassium, magnesium, these can have their own issues (eg. firing them generates of gases and fumes harmful to kiln refractories). Heavy clay industries can tolerate clays with higher sulfate contents, but other industries, such as tile, need lower contents).

Out Bound Links

  • (Articles) Organic Matter in Clays: Detailed Overview

    A detailed look at what materials contain organics, what its effects are in firing (e.g. black core), what to do to deal with the problem and how to measure the amount of organics in a clay material.

  • (Glossary) Deflocculation

    In ceramics, when we speak of deflocculation, we are almost always talking about making a casting slip. Glazes can also be deflocculated (to reduce water content and densify laydown). Deflocculation is the process of making a clay slurry that would otherwise be very thick and gooey into a thin po...

  • (Materials) Barium Carbonate - BaCO3

    Barium Carb, Witherite

  • (Hazards) The Use of Barium in Clay Bodies

    Hazards of barium carbonate, considerations regarding its use in clay bodies for precipitation of soluble salts


By Tony Hansen




Feedback, Suggestions

Your email address

Subject

Your Name

Message


Copyright 2003, 2008, 2015 https://digitalfire.com, All Rights Reserved