ASTM F1839-08 (R2021) pdf free download.Standard Specification for Rigid Polyurethane Foam for Use as a Standard Material for Testing Orthopaedic Devices and Instruments.
1.1 This specification covers rigid unicellular polyurethane foam for use as a standard material for performing mechanical tests utilizing orthopaedic devices or instruments. The specification is applicable to sheets or blocks of foam, or foam that is made by the user using a two-part liquid mixture.
1.2 This specification covers polyurethane foam material that is used in the laboratory for mechanical testing, as described in 1.1. These materials are not intended for implantation into the human body.
1.3 The foam described herein possesses mechanical properties which are on the order of those reported for human cancellous bone. See Appendix Xl, Rationale, for further information regarding the appropriateness of using the sped- fled foam as a model for human cancellous bone.
1.4 This specification covers compositional requirements, physical requirements. mechanical requirements, and test methods for rigid polyurethane foam in the solid final form.
1.5 This specification provides qualification criteria for vendor or end user processes and acceptance criteria for individual material lots.
1.6 This specification provides mechanical properties of five different grades of foam in the solid final form. A foam that does not meet the specified mechanical properties shall he identified as an ungraded foam.
1.7 The values stated in SI units arc to be regarded as standard. No other units of measurement are included in this standard.
3. Terminology
3. 1 Definitions:
3. 1.1 final form—the condition of the foam product when used by the end user to perftrm tests of orthopaedic devices or Instruments.
3.1 . 1 .1 Discussion—This is the condition of the foam product of which all physical and mechanical tests required by this specification are performed. In the final form the foam is in a uniform solid such as a slab. plate. or block.
3.1.2 foa,n rise direction—the nominal direction that the foam rises during the polymerization (“foaming”) process, either at the supplier’s production facilities for the solid supplied foam, or at the end user’s facilities for foam produced from the liquid supplied form. The foam rise direcion shall be marked on the foam block or indicated in the shipping documentation for foam that is supplied in the solid form.ASTM F1839 pdf download.