Is R-134A flammable at ambient temperatures and atmospheric pressures?

R-134A, or tetrafluoroethane, is classified as a non-flammable refrigerant under standard conditions, which means it does not ignite at ambient temperatures and atmospheric pressures. The chemical properties of R-134A indicate that it has a high flash point and does not support combustion, making it safe to use in most refrigeration and air-conditioning applications without the risk of fire.

The understanding of refrigerants includes the fact that they must be evaluated for flammability to ensure safety during handling and use. R-134A's characteristics ensure it remains stable and does not easily ignite, which is critical in environments where the refrigerant is present in significant quantities. This non-flammability contributes to its popularity as a replacement for older, more hazardous refrigerants.

Other options like "Only under pressure" or "Only in specific mixtures" suggest conditions where R-134A might be flammable, but these do not apply because R-134A maintains its non-flammable state under normal usage scenarios. Consequently, it is essential to consult properties and guidelines regarding refrigerants to ascertain their safety in operational conditions.