dop test การใช้

• A passive air cleaner that is rated as 90 percent efficient using the Atmospheric Dust Spot procedure, he said, would only achieve an efficiency rating of 60 percent using what is known as the DOP test, a method named after an abbreviation for the substance dioctylphthalate, which is used in the test because it evaporates to produce particles that are all exactly 0.3 microns in size.