In November 2007, the Ceramic Tile Distributors Association (CTDA) and the Tile Council of North America (TCNA) launched the Porcelain Tile Certification Agency (PTCA) to certify porcelain tile.
Standards define porcelain tile as an impervious tile with a water absorption of 0.5% or less, as measured by the ASTM C373 test method. However, there are many instances in which entities advertise and sell tile not meeting this standard as porcelain tile. Marketplace confusion, installation problems and even liability concerns can result when entities misrepresent non-porcelain tile in the marketplace.
Under the PTCA certification program, manufacturers who want to prove that their tile is porcelain — meeting the 0.5% water absorption criteria — can have professionals test their product to determine compliance with that requirement. Then, they may use the PTCA certification mark on their product packaging, marketing materials and more as confirmation of that compliance.