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Flammability of Refrigerant Blends

Recent changes to refrigerant safety standards oblige producers to meet rigorous testing and modeling requirements. As part of the process, organizations must test the flammability of their blends, including blends that aren’t flammable but may become so due to composition changes during a slow leak.

This Focus article examines the American Society of Heating, Refrigerating, and Air-Conditioning Engineers Standard 34 and other guidelines around the testing of refrigerant blends. We cover:

  • The steps for achieving standard approval for a given blend
  • Worst case formulation and worst case fractionated formulation
  • Testing requirements for different classes of refrigerants
  • Additional subclasses of flammability under the updated standard