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M332

Description

Mid-temperature, sandy, plastic, semi-vitreous, warm medium brown, native throwing body. M332 is made from seven different native clay materials and it is generally used for two reasons: its appealing warm red fired color at cone 5-6 and its combination of a sandy texture and high plasticity. M332 is attractive when used with glazes that absorb and highlight body iron and with ware that leaves some bare patches of clay showing. Many people find the texture and feel of M332 matches their way of throwing and they find they can make thinner and larger pieces.

Process Properties

M332 has a highly plastic base with a sand complement to add texture. While it throws very well and generates sufficient slip, it can be 'grabby' during throwing with care to make sure pressure surfaces are not well lubricated. Once you learn how to throw it you will be amazed at what it can do.

Cautions: Because of the sand content it can develop splits during construction or throwing if water is allowed to sit on the surface at stress points (i.e. the outer belly of a thrown vase). In addition, when pulling handles, you must develop techniques to minimize splitting. Given the sandy nature of the body, it is best to keep sponging of leather hard or dry ware to a minimum as this tends to remove fine particles at the surface and expose the coarser ones (a problem on the lips of functional ware. M332 needs to be dried with care to avoid cracking. We recommend the use of a grogged slip with minimal water content to assure even shrinkage on joins. Turn open shapes over as soon as they will support themselves and cover ware with cloth and plastic (not just plastic).

Firing

M332 fired bars from cone 4 to 8 oxidation (bottom to top).

M332 burns to a warm brick-red at cone 3-5, shifting to a medium variegated red brown at cone 6, and finally to a grey brown by cone 8. If you want the attractive red color remember that M332 undergoes a sudden color shift from red to brown between cone 6 and 7. Fire carefully to avoid overshooting the target temperature and losing the red. The redish color depends on the body firing to 4-5% porosity.

Glazing

Since we add materials with coarser particles and impurities to give the surface a more earthy appearance you can expect that the body will not provide perfectly clean glazed surfaces for functional ware. Glaze disruptions such as small pinholes and specks will be common. You can often solve this by soaking the firing at top temperature, firing a little higher, or using a more fluid glaze. In other cases it may be necessary to fire the bisque a little higher to expel more gases of decomposition. It extreme situations you may have to apply a slip between glaze and clay. On the other hand you may find that the gas expulsion 'activity' at the surface coupled with the body's coarser speck producing particles can 'liven up' a glaze and give it much more interesting effects.

Although M332 burns a warm red color at cone 5, if you apply a transparent glaze it will flux the surface and the color will likely darken and turn a brown shade characteristic of a cone or two higher. Thus, if you need to achieve red glazed colors it may be necessary to fire at cone 3-4. Also, because this is an iron-brown burning body it will impose some of its color on all glazes, darkening them and muddying most colors.

Glaze Recipes

You can develop a compatible glossy or matte base for this body from our suggested starting point base recipes available on our Internet web site at http://digitalfire.com/education/glaze/cone6.htm. Information is given on how to fit the glaze to your body and how to customize it it for colors, opacity, speck, variegation, etc. For slip decoration, be careful to match drying and fired shrinkage of the slip with the body since low temperatures generate little glass to adhere the slip.

Physical Properties

 Drying Shrinkage: 6.0-7.0%
 Dry Strength: n/a
 Water Content: 19.5-20.5%
 Drying Factor: c332
 Dry Density: n/a

Sieve Analysis (Tyler mesh):

     +48: 0.1-0.5%
   48-65: 2.0-4.0
  65-100: 6.5-9.5
 100-150: 6.0-8.0
 150-200: 8.0-11.0
 200-325: 8.0-12.0

Fired Shrinkage:

 Cone 4: 3.0-4.0%
 Cone 5: 3.5-4.5
 Cone 6: 4.0-5.0
 Cone 7: 4.5-5.5
 Cone 8: 5.0-6.0

Fired Absorption:

 Cone 4: 5.5-7.5%
 Cone 5: 4.5-6.0
 Cone 6: 3.5-4.5
 Cone 7: 2.5-3.5
 Cone 8: 1.5-2.5

Gallery

M332 bowl by Louise Bouchard.

Safety Data Sheet

Click here for web view.

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