Racetech blue silicone hose is made from polyester reinforced 3 ply 0.5mm thick Silicone. It can be used for coolant, heating and low temperature turbo charger systems. This blue silicone hose has a working temperature range of -50°C to + 170°C and its bursting pressure range is 120-500 PSI for standard 3 ply, although more plies can be used in construction for thicker, stronger walls.