ASTM D2412 is used to determine pipe stiffness and to characterize the material behavior of plastics in pipe form. There are many different materials that are used to make pipes so it is important to define this test as only covering thermoplastic resin pipe, reinforced thermosetting resin pipe (RTRP), and reinforced polymer mortar pipe (RPMP). Any other type of pipe such as PVC is not specifically covered under this test, however ASTM D2412 is used as a stand-in procedure and is back-referenced in many similar ASTM tests for hollow tubes and pipes.
The pipe is compressed between two platens in order to gather load-deflection data. Load measurements are taken at constant intervals.
1. Depending on the type of plastic pipe being tested, cut the specimen to the lengths specified. Be sure to cut the pipe cleanly. Condition the specimens to the temperature detailed in the specification. Prepare and test at least three specimens for each pipe.
2. Measure the length, average diameter, and average wall thickness of the specimen.
3. Load the specimen by centering it on the bottom plate and apply just enough force to keep the sample in place with the upper platen.
4. Begin compressing the specimen at the specified rate.
5. Be aware of line cracking, wall cracking, wall delamination, and break. Record the load and deflection when these events are observed.
6. Stop the test at break, when the load no longer increases with deflection or when the specimen reaches the required maximum deflection.