Bond Strength Testing of Plastics

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Bond Strength Testing of Plastics

Determining how to test the bond strength of plastics involves a three step process. The first step is to determine the bond that is to be tested and the temperature at which the plastic is to be tested. Is the plastic acting as a coating over another type of material or is it bonded to a material using an adhesive? Is the bond to be tested at elevated temperatures or is it to be tested below subzero temperatures? This will help to determine which machine to use and its accessories. The next step is to determine which type of test to perform. This will aid in the selection of the testing fixtures as each type of test will require a fixture that will allow the sample to be properly orientated so that the bond experiences the specific stress designated by the test. For example is the plastic acting as a covering that will be pulled directly away form or off of the material or is it adhered to another surface and going to be twisted during the test? Depending upon which way the bond is stressed during the test, the test can range from anywhere between a tensile test to a shear test to a pull test to any combination of those. The final step is to determine the shape and setup of the plastic sample that is used during the test. For example is the plastic acting as a wire covering or is it glued to a metal plate? This will also help to determine which testing fixture to use during the test as certain shapes and setups will require unique fixtures to hold them.