R12 (Freon): Banned due to severe ozone depletion.
R134a: While not ozone depleting, it has a high GWP (1,430), failing to meet environmental standards, and its energy efficiency is generally lower than R600a.
R22: Also ozone depleting with a high GWP.
Using R600a (isobutane) refrigerant in refrigerators is one of the optimal solutions resulting from the combined effects of environmental pressure and technological advancements:
Extremely environmentally friendly (zero ODP, extremely low GWP).
Savings consumers money (high energy efficiency, low power consumption).
Technologically mature and reliable, with extremely low risk in home use due to stringent safety design.
Therefore, when you see an R600a label on a refrigerator, you know it's a more environmentally friendly and energy-efficient product.
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