F1: standard sheet is a sheet of the atata rubber foam, packed as a coil, for fast and economic installation in surface applications of ventilation ducting, cooling water and hot water piping. F2: sheet with aluminum layer is supplied with factory applied aluminum foil facing, help strong reinforcement weave offer superior physical protection to the insulation. F3: sheet with tissue interlayer system: the acrylic tissue interlayer adhesive system is designed to perform in a varie of extreme conditions. The tissue interlayer system is specially developed to ensure foolproof application. It\'s designed to be re-possitionable at the installation stage before permanetly. F4: all in one Specification can be made on customer requirement