During determination of ball-indentation hardness to ISO 2039-1 a spherical indenter 5 mm in diameter is pressed into the plastic under test, at a constant test load. The standard specifies a range of test loads, limiting the indentation depth to a range between 0.15 mm and 0.345 mm. The high test loads and large indentation allow measurement over a large test area, enabling strong averaging of the measured value.
Rockwell hardness tests to ISO 2039-2 or ASTM D785 can also be performed with this hardness tester. In contrast to ball-indentation hardness, in which the indentation depth is measured under load, indentation depth measurement using the Rockwell method takes place at a defined pre-load. Various indenters are available in line with the Rockwell scales.
The straightforward operation of the tester and well-established after-sales service in China were the key factors in the choice of ZwickRoell as a supplier. High-precision calibration of direct force and indentation depth guarantee excellent test-result reproducibility.