All of our clays are certified nontoxic in accordance to the
ASTM-D-4236 standard. This is an ongoing process, please contact us if
you have a specific question on a particular clay body or ingredient.
CONFORMS TO ASTM PRACTICE D-4236
Testing of raw materials should be an integral part of ceramic
manufacturing. Upon receipt of any new material, we strongly recommend
that you test the material. Sheffield Pottery, Inc.
has no control over either the variations that may occur in the natural
materials or their application. Therefore, our products are sold with
the understanding that the user is solely responsible for determining
suitability for any purpose and the results obtained. There are no warranties expressed or implied, regarding the user's finished product or results.