BYK-Gardner offers a wide variety of models and accessories to comply with ASTM and ISO methods related to a resistance tester. 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.