Canvas Cloth For Pipe & Duct Insulation Canvas is an extremely durable plain-woven fabric used for making sails, tents, marquees, backpacks, shelters, as a support for oil painting and for other items for which sturdiness is required. Canvas provides a protective barrier over pipe and duct insulation. Its 100% cotton fabric used for insulation of Galvanized Steel ducting. It works as a cotton insulation jacket for piping. Canvas Fabric / Cloth Specifications:First Quality Material 100% cotton greige single filled osnaburg Approx. Width 1 YARD (36inches) x Length 20YARDs (720inches)