Molykote 111 Compound Silicone Lubricant

MOLYKOTE 111 Compound Silicone Lubricant & Sealant

MOLYKOTE 111 Features & Benefits

• Wide service-temperature range: -40°F to 400°F (-40°C to 204°C).
• Excellent water resistance: Helps protect lubricated and sealed components exposed to moisture and water washout.
• Low volatility: Suitable for applications where low vapor pressure and low volatility are important.
• Silicone-based formulation: Made with silicone oil and an inorganic thickener.
• O-ring and seal lubrication: Suitable for many compatible rubber and plastic O-rings, gaskets and seals.
• Sealing capability: Designed for vacuum and pressure systems and gasket/seal applications.
• Electrical insulation properties: Provides dielectric strength and high volume resistivity.
• Chemical resistance: Generally resistant to dilute acids, dilute alkalines and many aqueous solutions.
• No intentional PTFE or PFAS: The current DuPont technical data sheet states that MOLYKOTE 111 contains no intentionally added PTFE or PFAS.

Aircraft Maintenance Applications

MOLYKOTE 111 Compound is used where a silicone lubricant or sealant is appropriate for the component and maintenance documentation. Typical applications identified by the manufacturer include:

The manufacturer also identifies applications involving outdoor equipment, meters, electrical service connections, transformer gaskets and equipment enclosures. These applications are not necessarily aircraft-specific; use on aircraft should be based on the applicable component and maintenance documentation.

Product Characteristics

The values above are typical properties reported by DuPont and are not intended to establish specification limits. Refer to the current manufacturer technical data sheet for complete product information.

O-Ring, Seal & Gasket Lubrication

One of the most common uses for MOLYKOTE 111 is lubrication of compatible O-rings, gaskets and seals. Applying the compound during installation can help reduce friction and prevent sticking of the sealing component to mating surfaces. The manufacturer reports compatibility with many plastics and elastomers, but compatibility should always be confirmed for the specific material and application.

Do not assume that MOLYKOTE 111 is compatible with every aircraft seal material. When servicing an aircraft component, follow the lubricant and seal requirements specified by the aircraft, engine or component manufacturer.

Electrical & Insulating Applications

MOLYKOTE 111 Compound also provides electrical insulation properties. DuPont reports a dielectric strength of 320 volts/mil and high volume resistivity over a broad temperature range. These properties support applications involving compatible electrical connectors, equipment enclosures, gaskets and other electrical or electronic components.

Use only where the applicable equipment or aircraft documentation permits a silicone compound. Silicone contamination can interfere with subsequent painting or finishing operations.

Important Compatibility & Use Limitations

• Do not use with liquid oxygen (LOX): DuPont specifically states that MOLYKOTE 111 should not be used in applications requiring LOX compatibility.
• Do not apply to surfaces that will be painted or finished: Silicone contamination can prevent coatings from adhering properly.
• Verify elastomer compatibility: Although MOLYKOTE 111 is compatible with many plastics and elastomers, the specific seal or O-ring material must be evaluated for the application.
• Verify grease compatibility: Do not assume that MOLYKOTE 111 can be mixed with another lubricant simply because both are silicone-based or used on similar components.
• Follow aircraft maintenance documentation: The aircraft, engine or component manufacturer's approved lubricant requirement takes precedence over a general application recommendation.

DuPont specifically warns against use where LOX compatibility is required and recommends evaluating the compound under actual end-use conditions before specification.

Application & Handling

MOLYKOTE 111 Compound can be applied by hand, brushing or wiping, or with appropriately designed automated equipment. DuPont notes that certain grease-gun designs may seize when used with the product and recommends testing the equipment before use.

For detailed handling, safety and application instructions, refer to the current manufacturer technical data sheet and SDS before use.

Shelf Life & Storage

The current DuPont technical data sheet specifies a 60-month usable life when stored between 0°C and 40°C in the original unopened container.

Product Information

MOLYKOTE 111 FAQ

What is MOLYKOTE 111 used for?

MOLYKOTE 111 Compound is used as a silicone lubricant and sealant for compatible O-rings, gaskets, seals, valves, vacuum systems and pressure systems. It is also used in selected electrical and electronic applications.

Is MOLYKOTE 111 suitable for aircraft maintenance?

MOLYKOTE 111 is used in aircraft-related applications including compatible O-rings, seals, gaskets and vacuum systems. However, the applicable aircraft or component maintenance documentation should always be checked before use to confirm that the product is approved or specified for the particular application.

What temperature range does MOLYKOTE 111 have?

The manufacturer specifies a service-temperature range of -40°F to 400°F (-40°C to 204°C).

Is MOLYKOTE 111 a grease?

MOLYKOTE 111 is a silicone compound with a grease-like consistency, consisting of silicone oil and an inorganic thickener. It is commonly described as a silicone grease or silicone lubricant, but its intended applications include both lubrication and sealing.

Can MOLYKOTE 111 be used on O-rings?

Yes, MOLYKOTE 111 is designed for use with many compatible rubber and plastic O-rings, gaskets and seals. Confirm compatibility with the specific O-ring or seal material and the applicable maintenance documentation before use.

Can MOLYKOTE 111 be used with oxygen systems?

Do not use MOLYKOTE 111 in applications requiring liquid oxygen (LOX) compatibility. DuPont specifically states that the product is not to be used with liquid oxygen.

How long is the shelf life of MOLYKOTE 111?

DuPont currently specifies a usable life of 60 months from the date of production when MOLYKOTE 111 is stored in the original unopened container at 0°C to 40°C (32°F to 104°F).

Is Dow Corning 111 the same as MOLYKOTE 111?

The product has historically been sold under the Dow Corning name as Dow Corning 111 Compound or Dow Corning 111 Valve Lubricant & Sealant. The current manufacturer product name is MOLYKOTE 111 Compound.