TIMETAL 21S is a metastable beta titanium alloy that offers substantial weight reductions over other engineering materials. It offers the high specific strength and good cold formability of a metastable beta alloy, but has been specifically designed for improved oxidation resistance, elevated temperature strength, creep resistance, and thermal stability. TIMETAL 21S is useful for applications from 550°F (228°C) to 1100°F (593°C). The alloy's resistance to aircraft hydraulic fluids, such as Skydrol, is excellent at all temperatures. TIMETAL 21S is well suited for metal matrix composites because it can be economically rolled to foil, is compatible with most fibers, and is sufficiently stable up to 1500°F (816°C). Strip is available in gauges from 0.016 in (0.4mm) to 0.090 in (2.3mm).