H-80, H60 Divinycell plain is rigid PVC foam with a closed, inert gas filled cellular structure. The 80 refers to Kilograms per cubic meter. Use 80 for walking decks and floors, 60 for everything else. These sheets are cut to ship in 2'x4' pieces for ease of shipping by UPS. You may pickup 4'x8' sheets here at the shop, if you select local pickup at checkout. Minimum order on 1/2" is 2 sheets.