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Recognized Consensus Standards

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Part B: Supplementary Information Sheet (SIS)
FR Recognition List Number 055 Date of Entry 12/21/2020 
FR Recognition Number 8-545
Standard
ASTM F2977-20
Standard Test Method for Small Punch Testing of Polymeric Biomaterials Used in Surgical Implants
Scope/Abstract
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)2; 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 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 (8), the small punch test provides a complementary mechanical testing technique to the uniaxial tensile test. 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).


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, 9, 10). This standard outlines general guidelines for the small punch testing of implantable polymers.
Extent of Recognition
Complete standard
Rationale for Recognition
This standard is relevant to medical devices and is recognized on its scientific and technical merit and/or because it supports existing regulatory policies.
Relevant FDA Guidance and/or Supportive Publications*
There is not relevant guidance developed at this time.
FDA Technical Contact
 Terry O. Woods
  FDA/OC/CDRH/OSEL/DAM/
  301-796-2503
  terry.woods@fda.hhs.gov
Standards Development Organization
ASTM ASTM International http://www.astm.org/
FDA Specialty Task Group (STG)
Materials
*These are provided as examples and others may be applicable.
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