Patent ID: 7363946

Claim:
A tube for pressurized air braking systems, said tube comprising a smooth synthetic rubber material sublayer, a plurality of rubberized fiber fabric reinforcement elements overlapped onto one another and arranged above said sublayer, said rubberized fiber fabric reinforcement elements being rubberized by rubber material which is the same material that forms said sublayer, said rubberized fiber fabric reinforcement elements having a further synthetic rubber layer coating said plurality of overlapped rubberized fiber fabric reinforcement elements made of the same rubber material as that of said sublayer and having on said further synthetic rubber layer, a heat resistant layer, said heat resistant layer being made of a silicon based fiber material comprising glass fibers, silicon fibers, ceramic fibers or mixtures thereof, said heat resistant layer being coated by a synthetic rubber outer layer made of the same rubber material as that of said sublayer, thereby said tube has a pressure resistance up to 5 atm, and a heat resistance temperature up to 700-800° C. for a free flame exposition of at least 15 minutes.