M340S, M340GS


M340 with 0.25% added 60-80 mesh granular manganese.


The added manganese produces a fine black fired speck that usually bleeds up through glazes. This body MUST NOT be fired higher than cone 6 or it will blister. Do not trust that your electronic kiln controller is accurate, verify using cones. Overfiring will result is loss of ware.

Fired test bars of M340GS from cone 8 (top) to cone 4.

M340GS with GA6A Alberta Slip base glaze. Cone 6.

Safety Data Sheet

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