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It appears that there is an adhesive failure vs a cohesive failure which reflects in ability for that adhesive to stick to that particular surface. Epoxies are designed for adhering to a particular surface wit specific surface treatments and cure times. Some epoxies require primers and extended cure times at specific tempatures. For instance, it may be more desirable to have an epoxy that has a lower shore d hardness that will allow for vibration but will be more prone to cohesive failure at higher temperature. A higher shore d rated epoxy will have better cohesion at higher temperature. When choosing an epoxy it all depends on the application. Aluminium is a very difficult surface to bond to unless pre treated with alodine or chromium. Aluminium oxidizing can occur depending on the chemical make up of the epoxy. The test they are doing does not take in any of these factors. Elmer's glue bonds wood very well but won't stick to metal that doesn't mean it's weak.
 
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