Powder coating tests - Impact test


Powder coating tests - Impact test

Impact test

Test standard: ASTM D2794

The resistance of a coating film against direct and indirect impact with a hard object is called impact resistance. To determine resistance against impact, a coated plate (metal plate 0.8 mm thick) is placed under a  indenter with a fixed diameter. Then the weight (often 1 KG) is dropped freely down along a guide tube from a variable height. Once the indenter comes into contact with the coated specimen, the surface is examined for cracks and flaking, grazing or loss of adhesion. Any sort of crack would mean failure in the result of the test.

After examining the deformation, the resistance to direct impact and an analysis of the convex deformation as a result of indirect impact are recorded.  

Prepared by: Mojtaba Zeinal

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