Plainsman M340 Cone 4-8 Buff Ceramic Clay Body, 20 kg
$33.95USD
In Stock
- Brand: Plainsman Clays
- Model #: PLAINSMAN-M340
Most products ship within 1 business day. Learn More
Plainsman M340 Cone 4-8 Buff Ceramic Clay Body, 20 kg
Plainsman's most popular mid-temperature, smooth, plastic, semi-vitreous, buff burning, native functional stoneware.
The M340 is made from a combination of Plainsman's A3 and B stoneware materials (as are H550, Buffstone and L212). It is their most popular body, widely used in schools, by hobbyists, and professional potters. Compared to bodies made from refined industrial minerals, M340's diversity of ultimate particle sizes produces a body of much higher dry strength.
M340 fires from a straw color at cone 4 to stone-grey-buff at cone 6 to grey by cone 8. It is best used at cone 6. Verify that firings-by-controller are not over-firing (e.g. cone 7) or pieces could warp.
M340 is high in silica and will craze fewer glazes than porcelains. However, crazing is possible if a glaze is high in sodium (i.e. from soda feldspar or nepheline syenite) or very low in SiO2 or Al2O3 (little clay or silica). For functional ware check glaze-fit using a boiling water:ice water immersion test.
Proudly Manufacturered in Canada by Plainsman Clays.
TECHNICAL SPECIFICATIONS:
Firing range: Cone 4–8
Drying Shrinkage: 6.0–7.0%
Water Content: 20.0–21.5%
Drying Factor: C120
Fired Shrinkage:
- Cone 4: 4.5–5.5%
- Cone 5: 4.7–5.3%
- Cone 6: 5.0–5.5%
- Cone 7: 5.5–6.0%
Fired Absorption:
- Cone 4: 3.5–4.5%
- Cone 5: 1.5–2.5%
- Cone 6: 0.5–1.5%
- Cone 7: 0.2–0.7%
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.
