Earthenware is referred to as a clay body which is fired to relatively low temperatures (below 1150C) and which, after firing remains porous in its unglazed state.
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"Earthenware" is in the NAICS Code "327111"
(Vitreous China Plumbing Fixture and China and Earthenware Bathroom Accessories ManufacturingTowel bar holders, vitreous china and earthenware, manufacturing)