Many university engineering departments and corporate technical libraries provide free database access (such as ASTM Compass) for students and employees.
The ASTM D2794 test involves the following steps:
Understanding ASTM D2794: The Standard Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact)
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A solid base anvil with a central hole slightly larger than the indenter tip. The test panel sits flat across this die. Step-by-Step Testing Procedure
After impact, the deformed area must be immediately examined for cracking, chipping, or loss of adhesion. Because micro-cracks can be difficult to see with the naked eye, technicians use specific verification methods:
Organic coatings protect surfaces from corrosion, weathering, and mechanical wear. However, in real-world applications, these coatings often face sudden, high-velocity impacts. Whether it is a stone chipping an automotive fender or a tool dropping on an industrial pipeline, a coating must resist cracking and delamination under rapid deformation. A solid base anvil with a central hole
For manufacturers and quality control labs, the standard for measuring this toughness is .
A mechanism to hold the test panel securely in place during impact. Step-by-Step Testing Procedure
The ASTM D2794 test involves exposing a coated test panel to a controlled atmosphere containing sulfur dioxide gas. The test panel is then evaluated for changes in appearance, including: Because micro-cracks can be difficult to see with
No. ASTM D2794 is strictly for organic coatings on metal panels. For testing plastic substrates, ASTM D5420 is the appropriate standard.
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When purchasing, ensure you select the "Redline" version. This PDF shows changes from the previous version, which is invaluable for labs updating their procedures.
For example, if a 4-lb weight dropped from a height of 20 inches causes the coating to crack, but dropping it from 18 inches does not, the impact resistance is recorded as . Factors Influencing Impact Resistance
Typically thin, standardized metal panels (usually steel).