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But not all paints and glues and other adhesives stick to all substrates in the same way. Surface preparation, or lack thereof impair effective bonding between the two materials. Since there is no immediate visual cue when that happens, the bond’s adhesion must be tested to ensure that it performs to satisfactory standards when placed in service. Adhesion, the measure of how well the fixative has bonded to its substrate, is evaluated through adhesion testing. This information can be used to determine the failure point of the adhesive — the least amount of duress which will cause the product to fail — for quality control and safety purposes.
Adhesion Testing Methods Include:
Cross-Cut Test: accomplished by cutting into the adhesive (all the way down to the substrate) in one of two patterns with a utility knife, applying pressure-sensitive tape over the area, and quickly pulling it off
Scrape Test: accomplished by using balance-beam scrape-adhesion tester to scrape adhesive off the substrate by way of a rounded stylus applied with increasing amounts of pressure
Each of these tests may be performed at multiple temperatures to account for the materials that expand or contract due to heat. These factors can also play a role in the test materials’ adhesion to its substrate. Although other standards can be used to perform adhesion testing, the methods listed above are the most commonly used.
Applied Technical Services Does All This and More!
For over 50 years, we have been providing materials testing, equipment inspections, and structural analysis services to our satisfied clients. We at ATS have a collection of certifications and accreditations that qualify us to take care of a variety of client needs, including any adhesion testing they may require to be performed.