On Thermal Acceleration of Medical Device Polymer Aging

Jakob Janting*, Julie G. Theander, Henrik Egesborg

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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An empirical rule, the 10 ∘C rule, states that chemical reaction rates are doubled for every 10 ∘C temperature increase. This is often used in thermally accelerated medical device polymer aging studies. Here, theoretical evidence and limitations for the rule are analyzed. Thus, a new more accurate rule based on averaging Arrhenius chemical reaction rate ratios over typical activation energies 0.1 eV -0.9 eV in the normal medical device accelerated test temperature interval 25 ∘C -70 ∘C is proposed. Comparison with the 10 ∘C rule shows that the 10 ∘C rule provides similar estimates, but only at the reference temperature 25 ∘C. Fitting the reaction rate ratio based on the Arrhenius equation using the reference temperature 25 ∘C to the 10 ∘C rule data reveals that best agreement is achieved with a thermal aging activation energy of 0.67 eV.
Original languageEnglish
JournalIEEE Transactions on Device and Materials Reliability
Issue number2
Pages (from-to)313-321
Publication statusPublished - 2019


  • Medical devices
  • Polymer degradation
  • Thermal acceleration
  • 10 ∘C rule analysis
  • Activation energies

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