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L211

Due to very limited sales we have chosen to discontinue production this clay body. To our valued customers using L211: Please consider trying one of our comparable clay bodies (such as M340, M325).

Description

Low to medium fire, slightly sandy, 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 and sand components make 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. Use similar caution when hand building. 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

Gallery


L211 cone 6 mugs with Ravenscrap GR6-M Floating blue glaze.

Safety Data Sheet

Click here for web view.

We Are Rationalizing Our Product Line

Plainsman manufactures bodies by grinding and pugging clays that we mine (native bodies) and by batch mixing bagged minerals and materials that we import (refined bodies). We stock about 10,000 boxes of 50+ clays (some in multiple stiffnesses) and need to reduce the warehousing and production burden of small-run bodies and remove obsolete and legacy products. For bodies being discontinued: We have migration paths and can assist with issues. Some changes involve increased cost. In certain cases you might consider having us custom-mix a body so you can continue to get it, but please work with us on trying to adapt to alternatives first.

This product has issues

  • This body is too similar to others that are superior to justify its production.
  • A legacy body recipe that predates newer and better materials.
  • A legacy body whose focus is better met by a refined material mix.
  • This body lacks plasticity and it cannot be improved without drying problems.
Logo Plainsman Clays Ltd.
702 Wood Street, Medicine Hat, Alberta T1A 1E9
Phone: 403-527-8535 FAX:403-527-7508
Email: tim.lerner@plainsmanclays.com