For tensile shear tests, the adhesive bonds were formed by the same general procedure but with 0.25411. overlap. The tensile shear strengths were measured with the Instron tensile tester by the general method of ASTM D1002-64, but using the precut specimens. These methods of forming the adhesive bonds gave very reproducible results when the same hot-plate temperature was used. Temperatures which were 20°C or more lower gave lower peel strengths with some polyesters because of poorer wetting of the specimens by the adhesive; temperatures which were '20°C or more higher sometimes gave lower peel strengths because of oxidation or breakdown of the polyester. In general, temperatures of 240" to 260°C were optimum when the adhesive flowed sufficiently to wet the specimeils adequately.