Krytox® Performance Lubricants Solutions for Improvement of Vehicle Performance and Perceived Vehicle Quality

H Carl Walther, Sr. Technical Service EngineerDuPont Performance Lubricants, USA

Michael SH Lee, Sales & Marketing RepresentativeDuPont Chemical Solutions Enterprise, Korea

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Krytox® Performance LubricantsProduct DevelopmentAnd Research Center,DuPont Experimental StationWilmington, DE, USA

Product Manufacturing,Chambers WorksDeepwater, NJ, USA

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Krytox® Development History

1959 DuPont Researchers Discover Fluorinated Oils1960-65 Grease development with US Navy, Air Force, NASA

1963 – Krytox® Used in GE Engine Test for the SST1964 – Mil Spec 27617 Developed Specifically to Cover Krytox

1965 First Commercial Quantities Sold to NASA for use in ApolloSpace Flight Program

1985 First Automotive Sealed-for-Life Bearing Application1986 First Automotive NVH Application

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Introduction to Krytox®

Excellent LubricityHigh Viscosity IndexBroad Range of Viscosity GradesExcellent Thermal/Oxidative StabilityInsoluble in Most Common SolventsImmiscible in WaterChemically InertBroad Material CompatibilityCompletely Non-FlammableIndustry Leading Product SafetyNon-Toxic

Krytox Oil Shielded Structure

Other PFPEs Non-Shielded

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Oil Properties Comparison

Property Mineral PAO Diester Silicones Krytox® Thermal

Stability Moderate Moderate Good Very Good Excellent

Oxidation Stability Moderate Very Good Very Good Very Good Excellent

Hydrolytic Stability Excellent Excellent Moderate Good Excellent

Volatility Moderate Very Good Good Very Good ExcellentViscosity

Index (VI) Moderate Very Good Good Excellent Good

Fire Resistance Poor Poor Moderate Good Excellent

Seal Material Compatibility Good Very Good Poor Good Excellent

Lubricating Ability Good Good Good Poor Excellent

Toxicity Good Excellent Good Excellent ExcellentCost ComparedTo Mineral Oil 1 3-5 3-7 30-100 80-300

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Oil Temperature Range Comparison

-60 -40 -20 0 20 40 60 80 100 140 160 180 200 240 260 300 Temperature ° C

High Viscosity Range Intermittent Use

Normal Range Continuous use

Low Viscosity Range Intermittent Use

Petroleum

Diesters

Polyalphaolefins

Polyolesters

Silicones

Perfluoropolyethers

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Grease Thickener ComparisonProperties Lithium Lithium

Complex Polyurea Organo- Clay PTFE1

Dropping Point, °C (°F)

177-204 (350-400)

260+ (500+)

243 (470)

260+ (500+)

~3002

(572)

Maximum Usable Temperature, °C (°F)

135 (275)

177 (350)

177 (350)

177 (350)

300 (572)

Water Resistance Good Good to Excellent

Good to Excellent

Fair to Excellent Excellent

Oxidation Stability Fair to Excellent

Fair to Excellent

Good to Excellent Good Excellent

Work Stability

Good to Excellent

Good to Excellent

Poor to Good

Fair to Good

Good to Excellent

Protection Against Rust Poor to Excellent

Fair to Excellent

Fair to Excellent

Poor to Excellent Poor to Good

Pumpability (centralized systems)

Fair to Excellent

Good to Excellent

Good to Excellent Good Good to

Excellent Source: Lubricating Grease Guide, Fourth Edition, 1996, p. 6.03

1 – PTFE column not included in NLGI guidelines. Added by author. 2 – PTFE thickened greases have no true dropping point as defined by ASTM D 2265

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Krytox® in Sealed-for-Life Automotive ApplicationsGenerally only used in the most demanding applications as required to meet warranty life requirements

Specific strengths of most importance for off-the-shelf products are thermal/oxidative stability and high viscosity index

A primary strength of Krytox® lubricants is DuPont’s ability to develop custom formulations for especially challenging applications

Custom formulations also address performance parameters such as fretting wear resistance, high energy corona stability, gear applications and centrifugal oil separation resistance

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Krytox® in Sealed-for-Life Automotive Applications (cont)

Application rates for typical high-speed (under hood) automotive bearings are generally in the range of 15 to 20% of the bearing free space - generally less than 1 gram per bearing

Application rates for typical lower speed (driveline) automotivebearings are generally in the range of 20 to 25% of the bearing free space

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CTQ Krytox® Lubricant Applications

Clutch Pilot Bearing ('99)

Electronic ParkingBrake ('01)

Fan Clutch ('88)

Alternator ('96)

EGR Valve ('01)Spark Plug Boots ('93)

Heavy Duty TruckAuto-Clutch ('04)

Cooling Fan ('96)

Windshield WiperMotor ('96)

Minivan Side DoorMotor Clutch ('00)

Rearview MirrorMechanism ('99)

Battery Vent Seals ('01)

Super ChargerLubricant ('93)

ABS SystemBearings ('95)

→ Components Designed with Custom Formulated Krytox® Lubricants

→ Krytox® Grease Introduced to Application as Major Problem Solver

→ New, 2nd Generation Patented Spark Plug Boot Lubricant Available as of ‘03

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Krytox® NVH Product Strengths

Krytox® oils and greases are compatible with all common materials used on automotive interiors as well as suspension bushings

The static coefficient of friction is lower than the kinetic coefficient of friction eliminating the potential energy build-up required for the generation of squeaks/itches/judders

The Krytox® oils and greases do not migrate away from the point of application

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Krytox® NVH Product Strengths (cont)

The application rate is generally about 4 grams per square meter

Most applications require less than 0.2 grams of grease or oil

Can be applied using robotic spray systems or by hand

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NVH Squeak Elimination With Krytox®

Window Lace

Window Guides &Weatherstrips

Instrument Panel(ash tray, cup holders, vents

glove box, fuse cover)

Leather Seats

Sun Roof Seals

Console Parts

Visor/Vanities

Actuators & Mechanisms

Leather Trim

Engine CompartmentLatch

Airbag Door/FaciaInterface

Seat Foam/MetalInterface

Facia & Trim Panels

Rear ParcelShelf Pins

Soft Top Seal

Bonnet Hinges

Seat Belt Guides

Shock Absorber/Suspension Bushings

Thank You For Your Attention

What Can We Do For You?

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