ASTM D429 covers procedures for testing the static adhesional strength of rubber to rigid materials, most commonly metals. Method A tests rubber assembled between two parallel metal plates in tension. Method B is a 90-degree stripping test from one metal plate. Method C uses a conical specimen.
For Method A, the rubber-to-metal bonded specimen is pulled apart in tension perpendicular to the bond surface. For Method B, the rubber is peeled from the metal plate at 90 degrees at a controlled rate.
These methods are important for evaluating adhesion of rubber components to metal substrates in aerospace applications, such as rubber-bonded vibration mounts, bushings, seals, and other components where rubber must maintain adhesion to metal under service conditions.