The specification describes two test methods, A and B. Method A is common and can be performed on a universal testing machine tensile testing machine. If you are going to perform this test, you should read the entire specification from ASTM. This is a quick summary to decide if this test is right for you and to point out what equipment you need to perform the test. The first video shows a typical system that is easy to use and has no comprimises.
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This summary is intended to help you understand the basic procedure and equipment required to complete this test with accuracy.
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. Measure the length, average diameter, and average wall thickness of the specimen. Begin compressing the specimen at the specified rate.
Be aware of line cracking, wall cracking, wall delamination, and break. Record the load and deflection when these events are observed.
Stop the test at break, when the load no longer increases with deflection or when the specimen reaches the required maximum deflection. ADMET testing controllers are capable of automatically performing and reporting these calculations at any given deflection.
Wide versions of all of these machines are available to accomodate large pipe diameters. ADMET testing controllers satisfy this requirement and can automatically record load and deflection. The eP2 Digital Controller, a standalone touch panel unit, offers a balance between performance and simplicity.
A pair of smooth compression platens capable of applying the required load without bending. The length of the plate should equal or exceed that of the specimen. Plate width should equal or exceed the pipes contact area at maximum deflection plus 6 in.
ASTM D412 Tensile Strength Properties of Rubber and Elastomers
ASTM D2412 Load Deflection of Plastic Pipe Test How to Guide
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