http://www.silicone.jp/e/products/oil/"Silicone fluids are typically clear, transparent liquids. Product types range from free flowing, water-like fluids to viscous, syrup-like fluids.
These silicone fluids are resistant to high and low temperatures, water, and chemicals. They have excellent electrical properties, and they exhibit mold releasability, water repellency, and defoaming characteristics not found in ordinary mineral and synthetic oil products.
Silicone fluids are thus used in a variety of applications ranging from electronics, transport machinery, chemicals, machinery, textiles, pulp, construction, civil engineering, cosmetics, and household goods."
http://www.clearcoproducts.com/pure_silicones.htmlSilicone fluid is also used as brake fluid.