Chemical Incompatibility Matrices

  • Type:
    Conference Presentation
  • Conference Type:
    AIChE Spring Meeting and Global Congress on Process Safety
  • Presentation Date:
    April 29, 2015
  • Duration:
    30 minutes
  • Skill Level:
  • PDHs:

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Chemical Incompatibility Matrices

Michelle R. Murphy and Surendra K. Singh

ioKinetic, LLC

95 Stiles Road, Salem, New Hampshire 03079, USA


Despite the promulgation of the “PSM Standard” by OSHA in 1992, chemical accidents continue to occur at an alarming rate.  As part of the process safety information element of the PSM standard, OSHA requires reactivity data on the chemicals in the process. Part of this reactivity data is a chemical incompatibility matrix. Several software programs provide simple approaches to generating these incompatibility charts for common materials using assigned reactive groups. If your process involves materials not included, you are left to determine the reactivity and incompatibilities on your own. This presentation will explain a process for assigning reactive groups using chemical classification and structural analysis. This process can be used for less commonly understood materials such as additives, lubricants, etc. that may come into contact with process chemicals.


Chemical incompatibility matrix, chemical reactivity, predicting reactivity, reactive chemistry

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