Pfeiffer F4 Oil Perfluorpolyether (PFPE) (sold here by the 0.5 liter bottles PK005886-T) is quality mechanical vacuum pump oil for the ultimate performance of your Chemical Resistant Pfeiffer Rotary Vane pumps. This oil is for pumping Oxygen, Ozone, Halogens, Uranium Compounds, Organic and Inorganic Solvents, HCL, BF3, PO3, and Flourine. This is Typically used in Duo or Uno "C" Corrosive Series Vacuum Pumps. Pfeiffer F4 (PFPE) Oil is specially prepared by Pfeiffer to meet the Corrosive Chemical Gases Rotary Vane exclusive specifications. See (AVAILABLE DOWNLOADS) below for F4 Oil MSDS Sheet .pdf.