this report describes the evaluation of hysol us0009 polyurethane as an encapsulant for the battery cable used on the mc1605b. the hysol resin was selected for the application because it was reacted with a non-carcinogenic curing agent and because it exhibited superior mechanical, electrical, and hydrolytic properties over a wide temperature range. the hysol encapsulant was evaluated to determine if it was superior to the en-7 elastomer as a sealant against electrolyte migration to the interior of the cable. environmental tests reported here showed the hysol was marginal when no preseal was employed but was 100 percent effective when a bird-cage seal was used inside the emr hardware. the en-7 encapsulant, on the other hand, was effective only when seals were employed both inside the emr hardware and at the lug terminations. without the two preseals, the en-7 compound was always unsatisfactory. twenty development battery cables fabricated with hysol under production operations were tested after alternate immersion in battery electrolyte and after exposures to temperature shock and the mil-std 202 environment. presealed cables successfully survived these exposures and retained their initial dc resistance, insulation resistance, and high potential properties with only minor changes. the environmental tests conducted with these assemblies probably represented five or more years of in-field service. comparative peel tests demonstrated that the hysol/neoprene insert bond was twice (5.2 versus 2.8 kg/cm) that of the en-7 polyurethane. hysol us0009 has a potential for encapsulation