Refrigerants that are flammable and have low toxicity belong to which group?

Refrigerants that are classified as flammable and have low toxicity fall under the A2 group. This classification indicates that these refrigerants are mildly flammable, meaning they can ignite under certain conditions but do not pose the same level of hazard as highly flammable substances. The "A" designation relates specifically to the toxicity level, where "A" represents low toxicity, making these refrigerants relatively safer for use in systems compared to those with higher toxicity ratings.

Understanding the classification system is crucial in power engineering and refrigeration systems. Knowing that A2 refrigerants can be used with precautions, allows engineers to select suitable refrigerants that balance safety, efficiency, and environmental considerations. The classification helps inform safety guidelines, handling procedures, and the design of equipment that utilizes these refrigerants.