ASTM D2794 establishes the standard method for evaluating the impact resistance of organic coatings by measuring their ability to withstand rapid deformation [1]. The test determines the maximum weight and height combination that causes coating failure, typically expressed in inch-pounds for quality control and product development. For more details on the testing procedure, visit Micom Laboratories .
The test is performed using a specialized piece of equipment known as an . The apparatus consists of a vertical guide tube with a graduated scale and a heavy weight that drops through it.
| Pitfall | Consequence | Solution | | :--- | :--- | :--- | | | Non-comparable results between labs | Always specify indenter diameter in your report. | | Varied Film Thickness | Thicker films almost always crack sooner | Measure dry film thickness (DFT) per ASTM D7091. | | Substrate Flexing | Panel bending absorbs energy, reducing impact on coating | Use rigid, flat panels per standard dimensions. | | Inspecting with Magnification | Overly sensitive detection (the standard forbids magnification) | Use naked eye only, unless customer spec requires otherwise. |
How much the coating can stretch with the substrate without breaking.
If your coating is failing ASTM D2794, check these variables:
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