ABSTRACT
The thermally conductive adhesive was used in a film version, but the filleting adhesive replacement was the most urgent part of the project because it was 85% of the total polysulfide adhesive usage. Metals have high thermal conductivity, and glasses and ceramics have much lower thermal conductivity. Plastics have even lower thermal conductivity than glass. Uralane 7760 adhesive would be adopted on all satellite programs as a filleting, thermal transfer adhesive. A mineral-filled polysulfide adhesive had been in use as a filleting adhesive around components and also in the form of a film adhesive under flat-bodied components. A Hughes materials specification (HMS 2289) and a processing specification for the new adhesive were prepared by members of our team. It was deemed necessary to add a sag resistance test to HMS 2289 because the previous polysulfide filleting adhesive was inconsistent from batch to batch and making the test an incoming requirement helped assure consistency with the new filleting adhesive.
