Figure 2. Extrusion
A four-point bending tensile test was chosen to determine the load properties, because in contrast to the three-point flexural test, there is a constant bending moment between the upper force application points. In this way, the material parameters are determined more realistically, especially in the case of plate-shaped samples, and these are less influenced by possible inhomogeneities in the sample. For the determination of the four-point bending tensile strength, based on DIN EN 12390-5 [13], were prismatic specimens (extrudate) manufactured and stored under water. The Test parameters are summarized in table 5.
Table 5. Test parameters 4-point bending tensile test