Temperature: 1500F

Description:Calcium carbonate, talc finished gassing

LOI is not important? Think again!

LOI is not important? Think again!

This chart compares the gassing behavior of 6 materials (5 of which are very common in ceramic glazes) as they are fired from 500-1700F. It is a reminder that some late gassers overlap early melters. The LOI (loss on ignition) of these materials can affect your glazes (e.g. bubbles, blisters, pinholes, crawling). Notice that talc is not finished until after 1650F (many glazes have already begin melting by then).

In Bound Links

  • (Temperatures) Decarbonation (200C-1000C)

    A wide range of carbonates are used in ceramics and each of these has its own thermal history. Within that is a range where they decompose to give off...

  • (Glossary) Carbon Burnout

    Ceramic bodies and glazes contain materials that release carbon as they decompose on heating. Clays, gums, plasticizers are examples. These can still be burning out at higher temperatures than most people realize (cone 04 or higher). That burning generates gases, if glazes are beginning to melt befo...

By Tony Hansen

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