Due to the very large number of tests offered, descriptions of those most commonly requested have been gathered into the following groups:

ISO 604 – Plastics – Determination of Compressive Properties

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ISO 604 testing examines the compressive properties of reinforced and unreinforced rigid plastics through a process of straining and loading the plastic at a relatively low rate of compression. Touchstone is also able to perform the technically equivalent standard, ISO 604 – Determination of Compressive Properties of Plastics.

Sample preparation is critical and all machining operations should be done carefully to ensure smooth surfaces. The machining of ends are particularly important to ensure they are smooth, flat and parallel with sharp and clean edges. Samples can be prepared carefully by the customer or Touchstone.

Testing is done by placing a small specimen of plastic (typically a cylinder 50 mm by 10 mm by 4 mm for modulus and 10 mm by 10 mm by 4 mm for strength) between two hardened blocks and slowly compressing it until the point of fracture. The results of this test include compressive strength, compressive yield strength, offset yield strength, and modulus of elasticity.

This method provides information about the compressive properties of plastics when employed under conditions resembling those under which the specimens are tested. Compressive properties include modulus of elasticity, yield stress, deformation beyond yield point, and compressive strength (unless the material merely flattens but does not fracture).

Please email or call (304) 547-5800 for information regarding test procedures, results, specimen information, pricing or any other ISO 604 questions you may have.


ASTM D695 – Standard Method for Compressive Properties of Rigid Plastic

ISO 604: Plastics – Determination of Compressive Properties