Incombustible duct hose and method for manufacturing the same

摘要

In an incombustible duct hose, a cloth material with a predetermined width is spirally wound to form a cylindrical shape, and a metal strip-like material caulks adjacent side edge portions of the spirally-wound cloth material to connect them. The cloth material is fabricated in a gas impermeable state by coating a silicone at least on one surface of a silica cloth sheet so that a texture of the silica cloth sheet is clogged by the coated silicone. The silicone is subjected to a fire retardant treatment by mixing a flame retardant.