Subheading 250810: Clays (Excluding Expanded Clays of Heading no. 6806); … etc.
Subheading 250830: Clays (Excluding Expanded Clays of Heading no. 6806); Fireclay, … etc.
Subheading 250840: Clays (Excluding Expanded Clays of Heading no. 6806); N.E.C. … etc.
Subheading 250850: Clays (Excluding Expanded Clays of Heading no. 6806); Andalusite, Kyanite and Sillimanite, … etc.
Subheading 250860: Clays (Excluding Expanded Clays of Heading no. 6806); Mullite
Subheading 250870: Clays (Excluding Expanded Clays of Heading no. 6806); Chamotte … etc.