Definition of Terms Tile Category Shade Variation Abrasion Resistance C.O.F. & ADA Frost Resistance Environmental Attributes MSDS ASTM Test Methods Warranty	Frost Resistance Industry criteria dictate that tile shall not exceed 5% water absorption to be recognized as frost resistant. To be recognized as Porcelain tile, the water absorption rate cannot exceed 0.50 % (impervious). Wall tile must not exceed 20% water absorption and is not frost resistant.