Plainsman H440 Cone 8-10 Dark Red Speckled Ceramic Clay Body, 20 kg

Plainsman H440 Cone 8-10 Dark Red Speckled Ceramic Clay Body, 20 kg

Attractive high temperature, sandy textured, plastic, semi-vitreous, dark red speckled burning, native body for reduction fired iron stoneware. H440 displays an attractive mottled surface with a range of deep reds and browns when fired in cone 10 reduction. H440 is not a vitreous body. The body is best suited for decorative pieces large or small (vases, bowls, planters, etc.).

H440 has a fairly high drying shrinkage and thus care and attention during drying are necessary for larger pieces, especially flat plates, shallow bowls, and sculptural ware. Cover pieces to make sure they dry evenly, take extra time drying if needed, and start the kiln slowly (candle overnight) for final water expulsion.

H440 is a deep red firing iron reduction body. The significant Fire-Red native clay complement in its recipe is the reason for the attractive color. Like other bodies of this type, H440 has been formulated so that cone 10R is at its transition point from a light brown to a dark red-brown.

H440 contains significant amounts of iron stone concretion particles which melt vigorously in high-temperature reduction and which blossom on the base surface and bleed up through glazes. The degree to which these speckles melt and develop depends on the degree of reduction.

Proudly Manufacturered in Canada by Plainsman Clays.

TECHNICAL SPECIFICATIONS:

Firing range: Cone 8–10
Drying Shrinkage: 6.0–7.0%
Water Content: 20.0–21.0%
Drying Factor: C120

Fired Shrinkage:

Cone 8: 4.5–5.5%
Cone 10: 5.0–6.0%
Cone 10R: 5.0–6.0%

Fired Absorption:

Cone 8: 4.0–6.0%
Cone 10: 3.0–4.0%
Cone 10R: 2.5–3.5%

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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