ASTM C-1027 describes the standard test method for determining visible abrasion resistance of glazed ceramic tile. Class 0 - Generally not recommended for use on floors; Class I - Light Traffic, for residential bathroom floors; Class II - Medium - Light Traffic, residential interiors with the exception of kitchens, stairs, landings and areas near external entries; Class III - Medium-Heavy Traffic, All residential applications. Commercial applications which are similar in traffic to residential applications. Specifically excepted are areas of prevalent circulation or turning points; Class IV - Heavy Traffic, all residential and most commercial applications such as the public areas of exhibition halls, hotels, restaurants, supermarkets, shops and schools; Class IV - Extra Heavy Traffic, all residential and most commercial applications similar to class IV where extra durability may be required.