Rotary Seal Design Guide - Seals Unlimited

Clipper ® Oil SealsCatalog EPS 5350/USAMaterialsH1L8 — Neoprene (CR)Neoprene offers very good resistance to weather,ozone and natural aging as well as good flameresistance while maintaining moderate resistanceto oil and gasoline. Good abrasion, flex andcracking resistance is available with the Neoprenematerial. Neoprene is recommended for operatingtemperatures ranging from -45 to +250 °F (-43 to+121 °C).H1L21 — Ethylene Propylene (EPDM)EPDM offers excellent heat, ozone and sunlightresistance. EPDM offers very good lowtemperature flexibility, good resistance to alkalis,acids (such as acetic), and oxygenated solvents(such as MEK). Provides improved resistance towater and steam in applications where NBR andFKM exhibit poor service life. Good replacementfor FKM where solvents are a problem. It is notrecommended for petroleum oil. EPDM isrecommended for operating temperatures of -60 to+300 °F (-51 to +149°C).H5L16 — Fluoroelastomer (FKM)FKM provides excellent resistance to oils, fuelsand hydraulic fluids at temperatures that farexceed standard Nitrile. It also has very goodresistance to flame and excellent impermeability togases and vapors. FKM is recommended foroperating temperatures that range from -40 to+400 °F (-40 to +204 °C).Case MaterialsH1, H3 — Neoprene/Aramid CompositeThe aramid fiber-reinforced composite shell will fita wide range of bore tolerances and provides arustproof gasket-type seal at the OD. Thecomposite case also will fill slight imperfections inthe bore housing, reducing machining cost.Usually combined with a Nitrile lip material.Spring MaterialsSprings are available in a wide range ofmaterials from Parker. Clipper Oil Seal designs arefurnished with 302 stainless steel springs asstandard. Other spring materials are available atan additional cost. Table 5-5 shows generaloperating parameters for the most common springmaterials.Table 5-5. Spring Material ParametersWire TypeSpring TypeMaximumServiceTemperature°C °FFor lip loading, the Clipper Oil seal uses a coilwire spring (garter spring).Garter spring benefits:• Provides a more uniform load to sealing lip• Heat treated — stress relievedApplicationCarbon Steel 120 250 General purposeMonel 400 230 450 SaltwaterInconel 750 675 1250 Extreme temperaturePhosphor Bronze 95 200 Saltwater302/304 StainlessSteel316 StainlessSteel260 500 Corrosion resistance315 600 Hi-temp corrosionresistance• Constant load with minimum load variations• Able to adjust the spring in the field toincrease loadTwo types of spring connections are used:1. Threaded type is used on most solid seals.2. Hook and eye type are used on splits sealsbecause they are easier for the end user toconnect during installation.55H5 — Fluoroelastomer/Aramid CompositeOffers the same construction benefits mentionedabove. Usually combined with a Fluoroelastomerlip material.Hook and EyeThreaded03/28/065-7 Parker Hannifin CorporationEPS DivisionToll Free: (800) 233-3900www.parkerseals.com