ASTM D1995 covers a set of standard test methods for multi-modal strength testing of autohesives (contact adhesives). Autohesive refers to an adhesive that possesses the property of autohesion, which is the formation of a spontaneous adhesive bond, due to molecular interdiffusion when two surfaces are pressed together. This principle finds commercial application in contact and cold sealing adhesives.
The ASTM D1995 prescribes the appropriate ASTM procedures by which autohesives can be tested for four common modes of stress application. These are ASTM D905 (Compression Shear), ASTM D1062 (Cleavage), ASTM D1781 (Climbing Drum Peel) and ASTM D1876 (T-Peel). Three pressure application modes, namely – static, roller, and impact, are indicated.
Various allowable adherend combinations involving rigid-to-rigid, flexible-to-rigid, and flexible-to-flexible adherends and the methods for application of pressure for each test mode are specified in Appendices X1 and X2 of ASTM D1995. Since there are various types of contact adhesives in a variety of applications with different materials and service conditions, the test methods in ASTM D1995 provide flexibility to the user to select parameters such as – test mode, coating thickness, environmental conditions, pressure mode and magnitude, open time, and bond-conditioning time.
The autohesive bond strength is reported in pounds per square inch (psi).
The ASTM D1995 prescribes the appropriate ASTM procedures by which autohesives can be tested for four common modes of stress application.