Dielectric compositions comprising ethylene polymer stabilized against water treeing with epoxy containing organo silanes

A dielectric composition comprising ethylene polymer and effective amounts, as a water treeing inhibitor, of at least one organo silane of the following formula:

• ##STR5## wherein A is an epoxy containing radical;
• Y is C.sub.1 to C.sub.8 alkylene;
• R.sub.1 is C.sub.1 to C.sub.8 alkyl, C.sub.1 to C.sub.8 alkoxy, C.sub.1 to C.sub.8 acyloxy, C.sub.6 to C.sub.18 aryloxy or substituted aryloxy;
• R.sub.2 and R.sub.3 are independently selected from C.sub.1 to C.sub.8 alkoxy, C.sub.1 to C.sub.8 acyloxy, C.sub.6 to C.sub.18 aryl or substituted aryl;
• C.sub.6 to C.sub.18 aryloxy or substituted aryloxy;
• a is an integer of 0 or 1.