Plainsman Coffee Cone 5-6 Black Ceramic Clay Body, 20 kg

Plainsman Coffee Cone 5-6 Black Ceramic Clay Body, 20 kg

Mid-Fire Coffee Black is made from a base similar to H550 with a 10% addition of burnt umber (a calcined naturally occurring pigmented clay). The umber colors the fired body and matures it enough for functional ware at cone 6. Coffee Clay is smooth and easy-to-throw.

Chemically, Coffee clay contains approximately 1% MnO. Maximum firing is cone 6, 2200F (because beyond that manganese fumes can be released as the umber decomposes, even before that it is gassing). Use cones to verify that your electronic controller or kiln sitter is not firing beyond cone 6 (this is also important to avoid bloating).

For brightly colored glazes (especially with layering) do a leach test (e.g. GLLE test). Consider using a transparent or white liner glaze for food surfaces.

Proudly Manufacturered in Canada by Plainsman Clays.

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.