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The classification "A2L-mildly flammable" for HFO-1234yf indicates that the substance can ignite under certain circumstances. The "A2L" designation specifically refers to the level of flammability defined by safety standards concerning refrigerants. The "A" signifies that it is not highly flammable, while the "2L" part indicates that it has a low burning velocity and a flammable range that can lead to ignition under specific conditions, such as exposure to an ignition source.

Understanding this classification is crucial in assessing the safety and handling requirements of HFO-1234yf. It means that while the substance is not considered highly flammable, precautions should still be observed to avoid situations that could lead to its ignition. This classification informs users that they can work with the refrigerant safely, but they must remain aware of its potential to ignite under certain circumstances, such as high temperatures or friction igniting vapors.