Astm-d2794 ((exclusive)) -

Most labs use a Gardner-type variable-height impact tester. The operator places a weight (typically 2 lbs or 4 lbs) on a sliding tube, raises it to a predetermined height (measured in inch-pounds), and releases it. The formula is simple:

The principle of ASTM D2794 is surprisingly simple. A coated metal panel is placed in a fixture, and a weighted, rounded indenter is dropped from a specific height onto the coated surface. astm-d2794

Ensure your impact tester is calibrated, your panels are flat, and you always inspect under consistent lighting. When in doubt, run five replicates—impact testing can be surprisingly variable. Most labs use a Gardner-type variable-height impact tester

It is an excellent "torture test" for surface prep. If a metal substrate wasn't cleaned properly (oils or rust present), the coating will pop off during the reverse impact test, alerting the QC team to a process failure. A coated metal panel is placed in a

Usually a 1 kg or 2 lb (0.91 kg) cylindrical weight with a hemispherical punch.