Miller-Stephenson Connector Lubricants contain polyphenyl ether (PPE). These lubricants can help protect noble metal connector surfaces from wear, oxidation and tarnishing. They help prevent galling and seizing of precious metal connector surfaces. The polyphenyl ether lubricants are completely inert toward plastics and other materials used in electrical connectors. They are non-migrating and do not impede the flow of electrical current through the contacts.