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L211

Description

Low to medium fire, smooth, medium plastic, fires to straw color. L211 contains 13% nepheline syenite to act as a flux to make it vitrify in the cone 6 range. However has been sold primarily as a low fire clay for many years. We recommend switching to M340 at middle temperature and L212 at low temperature.

Process Properties

The silty component makes the body susceptible to water splitting (water penetrating into the surface and beginning to split the clay during or shortly after forming, especially where the surface is being stretched). You should use minimum water during throwing and use slip rather than water as much as possible. Where slip is squeezed out of joins, be sure to sponge it away immediately. Splits caused by this are often misinterpreted as drying cracks.

Firing

L211 fired bars. Cone 04, 02, 2, 4 and 6 (bottom to top).

L211 gradually matures and vitrifies over a wide range from cone 2 to about cone 8. When fired at cone 04-02, it is a yellow buff color and is porous like any other earthenware body. By cone 5 it is a greyish buff and by cone 7 it is stone grey.

L211 does not contain talc as most other buff earthenwares and thus it does not exhibit the higher expansions associated with talc bodies. This makes it more suitable for ware that will be exposed to thermal shock, but, it also makes it harder to fit glazes.

Physical Properties

 Drying Shrinkage: 4.5-5.5%
 Dry Strength: n/a
 Water Content: 19.5-20.5%
 Drying Factor: C120
 Dry Density: n/a

Sieve Analysis (Tyler mesh):

   48-65: 0.0-0.5%
  65-100: 1.0-2.5
 100-150: 1.5-3.5
 150-200: 3.5-5.5
 200-325: 8.0-11.0

Fired Shrinkage:

 Cone 04: 1.0-2.0%
 Cone 02: 2.5-3.5
  Cone 2: 3.0-4.0
  Cone 4: 4.0-5.0
  Cone 6: 5.5-6.5

Fired Absorption:

 Cone 04: 11.0-13.0%
 Cone 02: 8.0-10.0
  Cone 2: 6.0-8.0
  Cone 4: 4.0-6.0
  Cone 6: 1.0-2.0

Safety Data Sheet

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Logo Plainsman Clays Ltd.
702 Wood Street, Medicine Hat, Alberta T1A 1E9
Phone: 403-527-8535 FAX:403-527-7508
Email: plainsman@telus.net