ASTM D695-15Standard Test Method for Compressive Properties of Rigid Plastics
ASTM D695 is a test method used to determine the mechanical properties of unreinforced and reinforced rigid plastics, including high-modulus composites, when loaded in compression at relatively low uniform rates of straining or loading. Test specimens of standard shape are employed.
Testing is done by placing a small specimen of plastic (typically a prism 0.5 by 0.5 by 1 in. or a cylinder with a diameter of 0.5 in. and a length of 1 in.) 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 procedure is applicable for a composite modulus up to and including 41,370 MPa (6,000,000 psi).
Before conducting ASTM D695, it is important to read the entire specification. Standards can be obtained from appropriate standard authorities.