Dowsil (Dow Corning) Silicone fluids are high-performance, liquid lubricating materials. Whether your operating temperature be high or low, Dow have various silicone fluids to suit your application requirements. We supply Dowsil 510 Fluid, which is ideally suited for applications such as hydraulic arrestors (snubbers), hydraulically actuated valves and instruments used in nuclear plants and other applications where exposure to radiation is a possibility.