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Sulfur Dioxide Toxicity


Sulfur is an impurity in many common raw stoneware, fireclay, brick and earthenware clays (we have seen it as high as 5% in whole rock analyses of some earthenware clays!). During firing it forms a pungent gas that can detected in even small amounts. Sulfur dioxide is a common outdoor pollutant, it is a by-product of the burning of carbon fuels. Exposure can irritate the eyes, nose and lungs because it forms an acid when combined with moisture. Over exposure can have serious effects on the respiratory tract and ability to breathe, a doctor should be consulted.

Out Bound Links

In Bound Links

  • (Temperatures) Sulfur evolution (425C-650C)

    This happens on first fire for many bodies. Sulfur is an impurity in many ball clays and related stoneware and earthenware raw clays, it occurs as cal...

  • (Materials - General) Copper Sulfate - CuSO4.5H2O

    Copper(II) sulfate pentahydrate, blue stone, cupric sulfate, copper sulphate

  • (Materials - General) Sodium Sulfate Decahydrate - Na2SO4.10H2O

    Sodium Sulphate Decahydrate

  • (Materials - General) Anhydrous Sodium Sulfate - Na2SO4 - A source of sodium in the glass industry

    Salt Cake, Sodium Sulphate

  • (Glossary) LOI

    Simplistically, LOI is the percentage of weight a material loses on firing. Assuming firing to a typical stoneware temperature of 1200C, the amount of weight loss can be surprising. Kaolins, for example, lose around 12% (mainly crystal-bound water). Ball clays lose about half of that (a combination ...


By Tony Hansen




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