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Helmer Kaolin

Alternate Names: Helmar Kaolin

Description: Helmer clay

Oxide Analysis Formula
CaO 0.48% 0.02
K2O 0.53% 0.02
MgO 0.26% 0.02
Na2O 0.08% -
TiO2 1.13% 0.04
Al2O3 36.00% 1.00
SiO2 46.00% 2.17
Fe2O3 1.30% 0.02
LOI 13.22%n/a
Oxide Weight 243.04
Formula Weight 280.07


A kaolin deposit near Helmer, Idaho (US) that has been developed and promoted by Michael Wendt since the mid seventies. Helmer clay is used primarily for its 'flashing' properties in wood firing. Mr. Wendt prepares it using a wet process that removes soluble and iron particulate impurities.

Plainsman Clays sells the same material under the name "Troy Clay". Plainsman hammermills the raw product to about 40 mesh, a finer grade than the one from Mr. Wendt.

Related Information


Articles Rationalizing Conflicting Opinions About Plasticity
How can two potters have completely different opinions about the plasticity and workability characteristics of the same clay body
Helmer Kaolin Data Sheet
Materials Kaolin
The purest of all clays in nature. Kaolins are used in porcelains and stonewares to impart whiteness, in glazes to supply Al2O3 and to suspend slurries.
Typecodes Kaolin
Pure clay mineral, there are many brand names of varying purity and iron content.
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