Impact Test Astm — D2794 [exclusive]

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.

This test is critical for industries where coated metal parts are exposed to mechanical abuse during manufacturing, assembly, transportation, or end-use (e.g., automotive body panels, appliances, coil-coated siding, drum coatings). impact test astm d2794

statement because no absolute reference material exists for impact resistance. 10. Comparison with Other Impact Standards | Standard | Key differences | Status | |----------|----------------|--------| | ASTM D2794 | Hemispherical tip 0.625 in, support die 0.64 in opening, weight 2 or 4 lb, manual drop tube. | Withdrawn 2019 | | ISO 6272-1 | Similar geometry (20 mm tip, 27 mm die opening) but requires calibrated drop height, allows pneumatic or automatic release. Includes precision data. | Active | | ASTM D5420 (Gardner impact) | For rigid plastics, not coatings on metal. Different tip/support sizes. | Active | | ASTM G14 | For pipeline coatings (larger indenter, heavier weight). | Active | | NCCA II-12 | Coil coating industry method, based on D2794 but with stricter panel specs. | Active | A weighted, hemispherical-tipped indenter (diameter: 0