Ball Clay, Kentucky OM4 Old Mine #4 OM-4
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A fine-grained ball clay with excellent plasticity and strength. Old Mine #4 is an "industry standard" based on its popularity in both casting and plastic formed bodies. It is also widely used as a suspension aid in glazes.
OM#4 ball clay is variable in nature and tends to be more vitreous than some of the more refractory ball clays that are available.