Impact Tester Model 304 Verschiedene Various Each version can be upgraded with various test sets testing equipment for quality management Technical Description

Surface coatings are frequently subjected to impact and shock loads which deform the base material, thus placing stress on the adhesion and cohesion of the coating. ERICHSEN Impact Tester 304 are used for determination of impact resistance, deformability and tensibility of coatings and substrates as well as adhesion of the coatings. The ball impact test simulates this type of stress under standardised conditions. A ball punch of defined weight the bottom of which is of fixed diameter, is dropped freely down a guide tube from an agreed or variable height. In this case a defined weight, which sample-side...

Model 304 - General Description The Impact Tester, Model 304, in all its variations, consists of a sturdy base plate with attached holding arm into which the slotted fall tube is clamped (transverse thread screw). In the ISO versions the screw is tightened with a clamping lever enabling the apparatus to be set quickly for different specimen thicknesses. The lever can also be pulled out a short way against a spring force. It is thus disengaged and can be turned freely. Below the falling tube and carried in the base plate is mounted the die in accordance with the relevant standard. The die is easily...

The specimens deformed by the ball impact are normally examined for cracks and peeling visually perhaps with the aid of a magnifying glass. To ensure that less obvious cracks will still be identified, the ASTM D 2794 standard suggests two more sensitive methods of examination: • Application to the specimen of copper sulphate solution to enable the smallest faults in the coating to be shown up in clear contrast. This procedure is only effective, if the base material is steel and if any anti-corrosion coating such as phosphating has also broken through as a result of the impact. • In the case of...