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ANSI A137.3-2017/A108.19-2020
Specifications for Gauged Porcelain Tile and Gauged Porcelain Tile Panels/Slabs (Material and Installation Standards)
American National Standard Specification A137.3 describes the minimum physical properties and grading procedures for gauged porcelain tiles and gauged porcelain tile panels/slabs. It provides quality criteria for buyers, specifiers, installers, manufacturers, and the public in general. ”Gauged” means manufactured to a thickness that is specific and largely associated with installation and use.
Tile Council of America [tca]