Subheading 691010 applies to fixtures made of porcelain or china — a vitrified, translucent ceramic body fired at high temperature. Subheading 691090 covers sanitary fixtures made from other ceramic bodies, such as fireclay or earthenware, which are typically less vitrified and opaque. The distinction matters because duty rates and any applicable trade-remedy measures may differ between the two subheadings.

Ceramic sanitary fixtures are not subject to mandatory FDA or USDA admissibility review, but they may need to comply with NSF/ANSI standards for lead content in fixtures that contact drinking water, as required by the Safe Drinking Water Act. Compliance with these standards is a market-access and liability matter; CBP does not routinely enforce NSF certification at entry, but importers bear responsibility for product conformity.