centimeter and the preferred organic polymers have a surface tension above about 25 to 30 dynes per centimeter the preferred blends are within the range of miscibility of the constituents and contain anexcess of the low surface energy organosilicon constituent especially preferred are polymer blends of poylsiloxanes and polyepoxides samples of a commercially available epoxy based encapsulant dexter hysol 4450 containing some organosilicon and other inorganic fillers were exposed to uv ozone oxygen plasma and flame treatments for various durations as shown in fig1 advancing di water contact angle on the dexter hysol surfaces were reduced from initial average values greater than 100 degrees to a values less than 10 degrees for uv ozone and plasma treatments and to less than 30 degrees for the flame treatment contact angles were then monitored as a function of aging time during storage in lab ambient conditions as the figure shows the uv ozone treated surface maintains its high degree of hydrophilic character upon aging while the plasma and flame treated surfaces revert back to a more hydrophobic character high resolution x ray photoelectron spectroscopy xps in the si 2p photoemission band suggest that during uv ozone and plasma treatments of the dexter.