SHEAR STRENGTH AT 75°F TO 500°F OF FOURTEEN ADHESIVES USED TO BOND A GLASS-FABRIC-REINFORCED PHENOLIC RESIN LAMINATE TO STEEL

摘要

Fourteen adhesives used to bond a glass-fabric-reinforced phenolic resin laminate to steel were tested in order to determine their shear strengths at temperatures from 75°F to 500°F. Fabrication methods were varied in an effort to evaluate the effect of placing cloth between the faying surfaces to maintain a uniform bond line. The tests showed that sandblasting the faying surfaces to a roughness of 100 to 120 micro-inches per inch root mean square was a good method of surface preparation. Preliminary tests of all adhesives at 75°F, 250°F, and 500°F showed that one particular phenolic adhesive had a singular combination of high strength and heat resistance. Additional strength-temperature data showed that the adhesive had a shear strength of 3,400 psi at 300°F and over 1,000 psi at 500°F. The data from the preliminary tests on all the adhesives are presented in tables and in bar-graph form. The fabri­cation methods used with each adhesive are described.