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An application frequently requested in our material characterization testing laboratory is a simple assessment of surface cleanliness.  Materials and pieces used in medical devices may be handled multiple times, by multiple departments and/or specialty contractors.  To maintain quality control through these multiple steps, a simple testing procedure is needed to confirm that the materials have been properly handled.

Variations on a frequently used procedure may include a rinsing with Purified Water for Injection (WFI), with or without agitation for a period of time at a specified temperature.  The material will be removed from the container and the rinsate will be separated into aliquots for one or more analyses that typically include:

  • Total Organic Carbon (TOC), USP <643> or an in-house quantification method
  • Microbial Bioburden, USP <1227>
  • Bacterial Endotoxins (LAL), USP <85>, Kinetic Chromogenic or Kinetic Turbidimetric
  • Particulate Matter, USP <788> Method I Laser Particle Counting method