This method is used to investigate the compressive behavior of the test specimen, and for determining the compressive strength, compressive modulus, and other aspects of the compressive stress/strain relationship under the conditions defined.
The ISO 604 test method is suitable for use with the following range of materials:
- Rigid and semi-rigid thermoplastic moulding and extrusion materials, including compounds filled and reinforced by short fibers, small rods, plates or granules in addition to unfilled types; rigid and semi-rigid thermoplastic sheet;
- Rigid and semi-rigid thermoset moulding materials, including filled and reinforced compounds; rigid and semi-rigid thermoset sheet;
- Thermotropic liquid-crystal polymers
For this test, the specimen is compressed along its major axis at constant rate of displacement until the specimen fractures or until the load or the decrease in length reaches a predetermined value. The load sustained by the specimen is measured during this procedure.
We used hardened-steel compression anvils to apply the deformation load to the test specimen. These anvils are fitted to a tensile testing machine, usually of single-column or dual-column table-top design. An extensometer is attached to the test specimen incorporate a mechanism suitable for determining the relative change in length of the appropriate part of the test specimen. Using materials testing software, such as Bluehill® 2, allows you to input specimen details, set the desired test control, automatically calculate the desired results and statistics, and produce a test report all in accordance with the standard.
We suggest reviewing ISO 604 to fully understand the test fixture and results requirements.