StructureTec Blockout 20 (JSTBO20) is a 20 oz. premium knife-coated vinyl used as a tensile structure fabric. Built with a blockout to eliminate the transmission of light, it is produced with the necessary fire-retardant treatments to meet NFPA-701 and is stocked in a 98.5” width. Also available is Blockout 22, a 22 oz. version with additional strength and durability.