1.1 This test method covers the determination of mechanical behavior of polymeric biomaterials by small punch testing of miniature disk specimens (0.5 mm in thickness and 6.4 mm in diameter). The test method has been established for characterizing surgical materials after ram extrusion or compression molding [1-3]; for evaluating as-manufactured implants and sterilization method effects [4, 5]; as well as for testing of implants that have been retrieved (explanted) from the human body [6, 7]. 1.2 The parameters results of the small punch test, namely the peak load, ultimate displacement, ultimate load, and work to failure, provide metrics of the yielding, ultimate strength, ductility, and toughness under multiaxial loading conditions. Because the mechanical behavior can be different when loaded under uniaxial and multiaxial loading conditions , the small punch test provides a complementary mechanical testing technique to the uniaxial tensile testingtest specified for medical grade polymers by ASTM F648. However, it should be noted that the small punch test results may not correlate with uniaxial tensile test results. 1.3 In addition to its use as a research tool in implant retrieval analysis, the small punch test can be used as a laboratory screening test to evaluate new materials with minimal material waste . 1.4 The small punch test has been applied to other polymers, including polymethyl methacrylate (PMMA) bone cement, polyacetal, and high density polyethylene (HDPE), ultra high molecular weight polyethylene (UHMWPE), and polyetheretherketone (PEEK) [2,3,5,10,11]. This standard outlines general guidelines for the small punch testing of implantable polymers. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.
KeywordsUltra-high molecular weight polyethylene, UHMWPE, Polyetheretherketone, PEEK, PMMA, small punch test, mechanical behavior, miniature specimens
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
Ballot Item Approved as F2977-2013 and Pending Publication