Silicone Grease: Benefits, Risks, and Urban Myths Quick Overview Silicone grease often has a bad rap in automotive manufacturing, despite its ability.

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Presentation transcript:

Silicone Grease: Benefits, Risks, and Urban Myths Quick Overview Silicone grease often has a bad rap in automotive manufacturing, despite its ability to outperform synthetic hydrocarbon greases. This Quick-Study explores the benefits, risks, and myths around silicone grease as a lubricant for automotive window regulators — though the lessons learned here apply equally well to other automotive parts that may benefit from a silicone grease.

The Basics: What is grease and how does it work? Additives enhance critical performance qualities of a grease, such as low temperature torque, corrosion protection, and oxidation resistance. Oils lubricate. They form a protective film between two surfaces to prevent friction and wear. Thickeners hold the oil in place, much like a sponge holds water. When mated parts move, the thickener is sheared and releases oil to form a lubricating film between moving parts. Thickeners reabsorb oil when motion stops. Solid lubricants like PTFE, MoS 2, and graphite are load carrying additives that improve the lubricity of a grease, especially on start-up.

Silicone grease offers performance improvements over greases typically used to lubricate window regulators Benefits of Silicone ■Repels water. ■Significantly improves low and high- temperature performance without much physical change: ■Si = -50°C to 150°C ■PAO = -20°C to 120°C ■Offers excellent adhesion and long- term pliability. ■Retains chemical and physical properties over time for extended durability. ■Resists chemicals, salt, wind, UV, and IR radiation. ■Does not harden, dry out, or become brittle with age the way carbon-based materials do.

The science behind the benefits Si-O “molecular backbone” is significantly stronger than C-C links, which means: ■Significantly more resistant than standard hydrocarbon greases to temperature extremes, shear stresses, water, and chemicals. ■Excellent “oxidation stability” — so no sludge, especially at high temperatures, which is common with hydrocarbon greases. ■Shear stability up to 20x higher than hydrocarbons, providing longer life at higher speeds and heavier loads.

Silicones vs. Hydrocarbons: Cost-benefit analysis Silicones may have a higher purchase price than hydrocarbons but… ■Less grease may be used per part. ■Superior reduction of noise and vibration at extreme temperatures. ■Easier to apply, cures more quickly, and enables automated production processes. ■Lasts longer than hydrocarbons, which means fewer failures and longer product life cycles. …and they improve customer satisfaction and loyalty.

The risk of silicone contamination in automotive manufacturing plants has developed into an urban myth. Before evaluating the “real risks,” let’s explore the myth. Silicones: Risk-benefit analysis

Most myths are rooted in some facts Fish Eyes The auto industry discovered in the 1980’s that silicone residue on unpainted metal caused “fish eyes,” which meant costly corrective measures. Silicones got a bad rap in the automotive industry, but not all silicones are created equal.

Exploring the myth: Silicone contamination can happen in two ways 2 “Fluid Creep” Manual Transfer + Direct Contact = 1 Volatile Silicones Silicone Aerosols + = Airborne Contamination

Volatile, airborne silicones were the culprits in paint shops Volatility is related to the viscosity of the silicone fluid Volatility High Low Very Low Fluid Viscosity 1=water) Consistency 0.65Thinner than water 50Vegetable Oil 100SAE 10 Motor Oil 500 SAE 30 Motor Oil 2,000Honey Molasses 20,000,000 Thicker than chewing gum Silicone fluid used in ECL’s UltraSil 712

The risk of airborne contamination and “fluid creep” with UltraSil 712 is virtually zero The Chemistry of UltraSil 712 ■High-viscosity, low-volatility silicone fluid is “encased” in a lithium thickening agent (fortified with PTFE for improved lubricity). ■Evaporation after 24 hours at 100°C = 0.15% ■Oil Separation after 24 hours at 100°C = 1.4%

“Fluid Creep” Manual Transfer + Direct Contact = Assessing the “real risk” of contamination with UltraSil 712 Volatile Silicones Silicone Aerosols + Airborne Contamination =

Simple risk prevention Rely on common sense After handling silicone or any grease, your hands may be a source of “direct contact” contamination. Wash hands thoroughly when leaving the area where silicone is used. Optional: Disposable gloves.

If accidents happen…  Use solvents designed to clean silicone grease (not the ones you use to clean up hydrocarbon greases.)  Dampen clean, dry cloth with solvent.  Use several cleaning strokes. Always start from the “non-contaminated” side of the surface. Clean surface edge last.

A note on solvents to clean silicone greases Several recognized chemical companies offer a variety of commercially available solvents specially formulated to clean surfaces contaminated by silicone grease. Dow Corning’s OS2 is a good example. DuPont also offers cleaners that can be used to clean silicone greases, particularly the 3900-series products. Note that some low-viscosity silicone oils can be used to clean silicone grease, usually followed by cleaning with soap water to remove any residue. Follow manufacturers’ use instructions. Your ECL rep can help you determine which solvent best suits your needs.

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