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PAO-4 is a devoted the bulk of aerosol challenge aerosol in the HEPA filter leak testing liquid, nonpoisonous and tasteless, Chinese name that corresponds to the hydrogenated -1-decenoic tetramers and 1-decene trimer; also known as poly-alpha-olefin poly-Alfa-olefins. concentration of the stock solution is 100%. United States FDA recommended PAO instead of DOP used HEPA filter testing.