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The automobile industry has accepted R-134a because of its low hose permeability, along with satisfactory efficiencies. R-134a is a very polar molecule, which contributes to its low solubility in non-polar lubricants such as mineral oils and therefore new lubricants had to be developed. R- 134a is not corrosive on standard steel, aluminum, and copper samples. R-134a is regarded as one of the safest refrigerants yet introduced, based on current toxicity data. The chemical industry''s Program for Alternative Fluorocarbon Toxicity Testing.