Senze-Instruments

Indentation Testers are the most used type of impact testers.
It consists of a die, a guide tube and an indenter.
The dimensions of the die, indenter and weight are function of the chosen test method.
The test sample is clamped onto the die with the coating either facing upwards or downwards.
The guide tube directs the falling weight perpendicularly onto the test sample.
There are two ways to evaluate the test result: as a quantitative test during which the minimum power to cause cracking is determined a qualitative test or pass/fail-test, during which it is observed if a certain power applied cause the coating to fail or not.

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 and DIN 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 exchangeable but at the same time is accurately fitted so that the centre lines of guide tube and die coincide.

At the bottom end of the falling weight is the ball punch appropriate to the die being used and this has on its side a protruding pin which is guided in the slot along the length of the tube and is used to lift the weight to the desired height. On the ISO, DIN and ECCA versions the mass of the falling weight can be doubled by bolting on an additional weight.
Scales are mounted along the slot which in the case of instruments for ISO, DIN, AFNOR and SNV standards are calibrated in „cm“ or for ASTM instruments in „inch lbs“. In the case of the ECCA version there are two different inch lbs scales on either side of the slot.