The Fomblin® Y grades of perfluorinated polyether inert fluids for use as lubricants in vacuum pumps. Fomblin® PFPE fluids are a mixture of fluorinated polymers obtained by a photochemical process that begins with hexafluoropropylene. Since the Fomblin® PFPE chemical chain contains only carbon fluorine and oxygen atoms these fluids have exceptional properties such as: Extremely Low vapor pressure Excellent Chemical inertness Exceptionally High thermal stability Excellent lubrication properties No flash or fire point Non-toxicity Excellent compatibility with metals plastics elastomers .Good aqueous and non-aqueous solvent resistance High dielectric properties Low surface tension Good radiation stability Environmentally acceptable.