A failed impeller that was part of a respiratory care related blower assembly was examined to understand specific fracture features that would provide insight on reasons for failure. The blower was assembled on September 24th, 2012, and the unit was being used in a laboratory setting for testing various respiratory response scenarios. Accordingly, the unit would have been in service for just under a year, and would have seen a maximum allowable operating speed of 73,000 rpm. The FTIR spectrum (using a Nicolet Centaurus FTIR system) exhibited peaks that were characteristics of a polyetherimide polymer (as shown in Fig. 1) a high performance amorphous thermoplastic, that is used for medical devices and pharmaceutical applications. This material typically shows exceptional mechanical properties, with a yield strength of 110 MPa and retention of mechanical properties at elevated temperatures [6].