Old Mine #4 Ball Clay (OM #4, OM4) is 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. It has some soluble salts which can give a brown coloration to the surface, so barium carbonate may be needed to precipitate these.

Quantity Discounts available for bulk purchases of full bags ("Bag (22.68kg / 50lb") as follows:

3-10 Bags 5%

11-39 Bags 10%

40-80 Bags 15%

81+ Bags 20%

See our Safety Data Sheets section under Customer Service for a downloadable copy of the SDS for this product.