Which refrigerant safety classification corresponds to the highest hazard in terms of flammability and toxicity?

Which refrigerant safety classification corresponds to the highest hazard in terms of flammability and toxicity?

• A. A3
• B. B2
• C. B3
• D. C3

Answer: (C)

High hazard occurs when both health risk and fire risk are at their highest levels. In refrigerant safety classifications, toxicity is labeled A (lower toxicity) or B (higher toxicity), and flammability is rated 1 (not easily flammable) through 3 (highly flammable). So the classification that combines high toxicity with high flammability—meaning serious health risk if inhaled or absorbed and the substance ignites readily—represents the greatest overall hazard. In the options given, the one that signals both high toxicity and high flammability fits this description best, because it pairs the more dangerous health effect with the most flammable level. The others either have lower toxicity or lower flammability, which reduces the overall risk compared with the high-toxicity, high-flammability pairing.

High hazard occurs when both health risk and fire risk are at their highest levels. In refrigerant safety classifications, toxicity is labeled A (lower toxicity) or B (higher toxicity), and flammability is rated 1 (not easily flammable) through 3 (highly flammable). So the classification that combines high toxicity with high flammability—meaning serious health risk if inhaled or absorbed and the substance ignites readily—represents the greatest overall hazard.

In the options given, the one that signals both high toxicity and high flammability fits this description best, because it pairs the more dangerous health effect with the most flammable level. The others either have lower toxicity or lower flammability, which reduces the overall risk compared with the high-toxicity, high-flammability pairing.