Plainsman M340S Cone 4-7 Buff Speckled Ceramic Clay Body, 20 kg

Plainsman M340S Cone 4-7 Buff Speckled Ceramic Clay Body, 20 kg

A cone 6 stoneware, the speckled version of M340.

Less vitreous than M340 to enable bloat-free ware at cone 6 (with a margin to cone 7).
More plastic than M340 enabling thinner and larger pieces.
Smoother than M340.

Toxicity: the vast majority of the manganese particles are encapsulated within the clay matrix. The tiny percentage exposed at the body surface are under the glaze. It is not the manganese particles themselves that expose at the glaze surface. Rather particle surfaces that contact the underside of the glaze bleed out into it from below, doing so as a function of the glaze thickness, opacity and melt fluidity. Thus, food contact with a glass surface having isolated manganese-pigmented regions is not at all the same thing as with raw manganese metal (or a glaze having powdered manganese as a colorant, some have up to 5%).

There should be no concerns with glazes, use the same ones you have always used.

Proudly Manufacturered in Canada by Plainsman Clays.

TECHNICAL SPECIFICATIONS:

Firing range: Cone 4–7
Drying Shrinkage: 6.0–7.0%
Water Content: 20.0–21.5%
Drying Factor: C120

Fired Shrinkage:

Cone 4: 4.0–5.0%
Cone 5: 4.5–5.5%
Cone 6: 5.0–6.0%
Cone 7: 5.5–6.5%

Fired Absorption:

Cone 4: 4.5–5.5%
Cone 5: 3.0–4.0%
Cone 6: 2.0–3.0%
Cone 7: 1.0–2.0%

Storage: Protect ceramic clay bodies from direct sunlight, avoiding excessive temperature changes and protect from frost.

Use: It is recommended to test clay body prior to large scale use in order to verify suitability in both the ceramic process (shaping, drying, firing and decoration) and the final application that is expected to be obtained.

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