What harmful substances can R-12 or R-22 decompose into when exposed to high temperatures?

When R-12 (dichlorodifluoromethane) or R-22 (chlorodifluoromethane) are exposed to high temperatures, they can decompose and produce harmful substances such as hydrochloric acid and hydrofluoric acid. This decomposition occurs because the high temperatures can break the molecular bonds in the refrigerants, leading to the formation of these acids, which are corrosive and can pose serious health risks.

Both hydrochloric acid and hydrofluoric acid are highly toxic materials. Hydrochloric acid can cause severe irritation to the respiratory system, skin, and eyes, while hydrofluoric acid is particularly dangerous because it can penetrate skin easily, leading to systemic toxicity. The production of these acids is an important consideration for technicians working with refrigerants, as understanding the potential hazards involved with the thermal decomposition of these refrigerants is crucial for safety and environmental practices.

While ammonia and nitrogen, carbon dioxide and sulfuric acid, and ozone and water vapor are all harmful substances in various contexts, they are not the decomposition products associated with R-12 or R-22 when subjected to high temperatures. This knowledge is critical for EPA 608 certification candidates to ensure safe handling and proper emergency responses in refrigeration and air conditioning