Scope:

The ASTM D2295 test technique is used to determine the comparative shear strengths of adhesives for bonding metals when they are tested on a standard specimen and under certain preparation and testing conditions at elevated temperatures. The ability to compare adhesive bond strength at increasing temperatures enables a better selection of adhesives that must perform at higher temperatures. This test approach helps in getting such information. 

Procedure:

The specimens are inserted in the pin-type grips of the testing machine and heated uniformly in the bond region, according to the ASTM D2295 test technique. Prior to the bond temperature calibration test, a fake specimen is used to calibrate the temperature. The specimen is then put to  the following test: Prior to applying load, no slack is allowed in the test fixture. The external thermocouple, which has been calibrated, regulates the temperature. For bondline temperature, the heating rate and time at a steady state are determined. The test temperature tolerance is kept to less than 1%. The test specimen is loaded to failure at a rate of 8.3 to 9.7 MPa unless otherwise stated. Each specimen’s load at failure, as well as the nature and extent of the failure, is recorded. 

Video 01: Explanation of an adhesive sealant’s overlap shear strength

Specimen size:

Lap shear test specimens are used in the ASTM D2295 test procedure. 

Data:

All failed loads must be represented in megapascals (pounds-force per square inch) and reported to three significant figures, according to ASTM D2295.

Conclusion:

The ASTM D2295 test technique is used to determine the comparative shear strengths of adhesives for bonding metals when they are tested on a standard specimen and under certain preparation and testing conditions at elevated temperatures.