Standards association ASTM International has published an updated version of its ASTM F1839 - 08e2 standard specification for rigid polyurethane foam used as a standard material for testing orthopaedic devices and instruments.
The specification covers rigid polyurethane foam blocks or sheets recommended for use as a standard material for mechanical testing using orthopaedic devices and instruments. These materials are not intended for implantation into the human body.
All materials should conform to the specified quality of appearance, dimensional stability, and composition, and values of void content, compressive strength, compressive modulus, shear strength, shear modulus, and screw pullout, ASTM said.
The specification describes the compositional requirements, physical requirements, mechanical requirements, and test methods for rigid unicellular polyurethane foam for use in testing orthopaedic devices.
The foam described in the specification is not intended to replicate the mechanical properties of human or animal bone, ASTM said.