Rotary Seal Design Guide - Seals Unlimited

FlexiLip MaterialsCommon Materials Used inthis ProductThe most popular fillers for FlexiLipproducts are graphite, fiberglass/molybdenum disulfide, carbon fiber andmineral.A complete listing of materialproperties and limitations appears onPages 9-7 and 9-8. Feel free to contactthe EPS division PTFE EngineeringTeam at (801) 972-3000 for moreguidance on material selection.0301 — Graphite FilledCatalog EPS 5350/USASince graphite is often used as a lubricant, it does notsignificantly increase the coefficient of friction of PTFE whenused as a filler. The low friction allows the compound to beused when both shaft speed and pressure are high. Graphitealso is chemically inert which enables its use in corrosivemedias.0615 — Proprietary Low Wear PTFEThis proprietary filled PTFE offers low wear and frictionproperties, used in general applications where long life isrequired. Not recommended for applications with abrasivemedia.0204 — Molybdenum Disulfide and Fiberglass FilledMolybdenum disulfide increases the hardness of the sealsurface while decreasing friction. It is normally used in smallproportions combined with other fillers such as glass. MoS 2 isalso inert towards most chemicals.0512 — Carbon Fiber FilledCarbon fiber lowers creep, increases flex and compressivemodulus and raises hardness. Coefficient of thermalexpansion is lowered and thermal conductivity is higher forcompounds of carbon fiber filled PTFE. Ideal for automotiveapplications in shock absorbers and water pumps.990127 — Mineral Filled — 3A Sanitary ApprovedMineral is ideal for high temperatures and offers low abrasionto soft surfaces. PTFE with this filler can easily be qualified toFDA and other food-grade specifications like 0127 and 0128.03/28/069-6 Parker Hannifin CorporationEPS DivisionToll Free: (800) 233-3900www.parkerseals.com