Description

Impact Test – “Falling-weight Test”
The impact tester has gained wide acceptance in testing the impact resistance of many types of coatings and substrates.
International standards describe a method for evaluating impact resistance of a coating to cracking and peeling from a substrate when it is subjected to a deformation caused by a falling weight, dropped under standard conditions yielding rapid deformation.

Impact Tester
■ Consists of a solid base with a guide tube support
■ The guide tube has a slot to direct a weight that slides inside the guide tube
■ A collar fits on the tube that helps the user slide the weight up to the accurate height
■ Graduations are marked along the slot to facilitate readings

Procedure
■ Place sample under the punch
■ Lift the weight to desired height on guide tube and let it drop
■ View the damage of the sample visually or with low powered magnification
■ Adjust the height and weight of the impacter to determine exact point of failure or establish pass/fail specifications