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Vacuum multifoil insulation systems are being developed for an implantable artificial heart. These insulation systems are thermally efficient and physically compact. The determination of the maximum allowable pressure for satisfactory vacuum foil insulation performance is reported. Also, the outgassing characteristics of several Ti and Nb-1Zr insulation packages were evaluated after 300 h of thermal testing and about 3600 h after final fabrication. The only gas found in the system was hydrogen, and possible sources of hydrogen are considered. Finally, outgassing characteristics of specific vacuum foil insulation material such as electroplated Ni, as well as procedures used to eliminate gas loads from this material are reported.