Devised at ARL by Dr. Norman de Bruyne and George Newell in 1941 for use in the aircraft industry, the adhesive is used for the bonding of metal-to-metal and metal-to-wood structures.
Other users included Bristol (on the Britannia), SAAB (on the Lansen & Draken), Fokker (on the F.27), Sud Aviation (on the Alouette II/III), Breguet and Fairchild, the film-form having the advantage of greater gap-filling ability with no loss of strength over Redux Liquid 775/Powder 775, allowing for wider tolerances in component-fit, as well as easier handling and use and controlled ratios of the liquid/powder components.
The coated joints are then allowed to stand for between 30 minutes and 72 hours, then the components are brought together under elevated pressure and temperature.
The curing process is by condensation and a typical figure for Redux Liquid 775/Powder 775 is 30 minutes at 293 °F (145 °C) under a pressure of 100 psi (690 kPa).
Strength of bonds to materials other than aluminium: Tensile shear of 0.5 in (13 mm) lap joints at room temperature: