1. Overview and Scope ASTM D2794 is a standardized test method used to determine the resistance of a dry, cured organic coating (paint, lacquer, varnish, or related product) to cracking or detachment from a metal substrate when subjected to sudden, rapid deformation (impact).
is the closest direct replacement. However, results between D2794 and ISO 6272-1 are not directly interchangeable due to differences in indenter/die geometry and panel clamping. 11. Practical Applications & Typical Values | Coating type | Typical reverse impact (in·lb) | Notes | |--------------|-------------------------------|-------| | General industrial enamel | 20–40 | Often fails at lower end | | Automotive clearcoat | 40–80 | Requires very flexible chemistry | | Polyester coil coating | 80–160 | High flexibility for post-forming | | Epoxy powder coating | 80–120 | Thicker films (2–4 mils) | | High-build polyurethane | 100–160 | Impact modifiers added | | PVDF (Kynar) | 120–180 | Extremely flexible | impact test astm d2794
A weighted, hemispherical-tipped indenter (diameter: 0.625 in or 15.9 mm) is dropped from a specific height onto the coated side (or reverse side) of a test panel, causing rapid indentation. The coating is then evaluated for cracking or loss of adhesion. However, results between D2794 and ISO 6272-1 are