Materials covered by this document are intended for use as deck coverings on U.S. Navy ships. Type I coatings are abrasion resistant and are for use on interior, dry, walking surfaces. Type II coatings, also abrasion resistant, are corrosion resistant and are for use on interior, wet, walking surfaces. Type III coatings are AFFF resistant and are for use on the deck of AFFF stations. Type IV deck coverings are for use on interior walking surfaces with an underlayment. Type V deck coverings are for use on interior walking surfaces without an underlayment. Type VI concrete is for use in areas requiring spark resistance, such as magazines. Class 1 deck coverings are not required to be off-gas tested and may be used aboard surface ships. Class 2 deck coverings are required to be off-gas tested and may be used aboard both surface ships and submarines. Grade A deck coverings must have a VOC content not greater than 250 grams per liter (2.08 pounds per gallon). Grade B deck coverings must have a VOC content not greater than 340 grams per liter (2.84 pounds per gallon). The resin chemistry is used to determine the composition.