One class of preferred hydrosiloxanes has the general formula R3-x Hx SiO--[R2-y Hy SiO]n --SiR3-z Hz where x and z are integers between 0 and 3, inclusive; y is between 0 and 2, inclusive; n is greater than or equal to zero; R is a phenyl or lower alkyl group (e.g., having 5 or fewer carbon atoms such as methyl, ethyl, or propyl); and copolymers thereof.