Ten units on temperature-accelerated aging test were soaked at 75 oc and full load for one week (168 hours, and the temperature was then increased weekly by 5 oC. In six weeks of testing, no fail ures occurred. The test was terminated at the end of the week during which the units had been at 105 oC for 168 hours. Disassembly showed some epoxy discoloration. By vendor specifications, all materials should be satisfactory up to 120°C