Kevlar 49-Epoxy composite structural insulators were fabricated from two and three dimensionally reinforced material. The insulator configuration was that of a cylindrical cup having both external and internal threads. Electrical and mechanical property data was obtained for test samples of both materials. Relatively little difference in electrical properties was obtained for the two materials; however, the mechanical properties varied markedly. The transverse strength of the two dimensionally reinforced material was 2000 psi in tension as compared with 110,000 psi in compression. In the three dimensionally reinforced composite the difference was less, 57,400 psi in tension and 71,000 psi in compression. These properties are described along with the techniques used to fabricate prototype parts of the two composites.