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DuPont Molykote (Formerly Dow Corning) High-Vacuum Grease

DuPont Molykote (formerly Dow) High-Vacuum Grease is a one component, non-melting silicone oil that is used for sealing and lubricating O-rings, chemical processing equipment, control valves, water treatment equipment, pressure systems, plug valves, and high temperature applications. It is a stiff compound with low volatility, and resists chemicals, water, mineral oils, common gases, and organic compounds.

Key Properties
NLGI Grade 3–4, translucent white, used primarily in sealing vacuum and pressure systems.

Applications
Lubrication for control and pressure plug valves, water softener and faucet valves
Sealant for vacuum and pressure systems
Sealant for outdoor equipment (including shipboard) exposed to washing and harsh environmental conditions
Protective coating for meters, electrical service entrance, and underground connections
Chemical barrier coating
Rubber and plastic O-rings, gaskets, and seals

Features & Benefits
Excellent resistance to most chemicals
Wide service temperature range
Low vapor pressure and low volatility
Outstanding water resistance
Meets FDA 21 CFR 175.300 compliance
Reduces wear in plastic-to-metal and rubber-to-metal contact

Composition
Silicone oil
Inorganic thickener

Product Details

Product Type

Compound

Chemistry

Silicone

NLGI Grade

3-4

Thickener

Silica

Cure Temp

NA°C

High Temp

204°C

Low Temp

-40°C

Color

Translucent White

Hazmat

No

Performance Data

Solubility
Molykote High-Vacuum Grease is insoluble in water, methanol, ethanol, acetone, glycol, and glycerine. It can be dispersed in kerosene, Stoddard solvent, benzene, toluene, ethyl ether, or petroleum ether.

Chemical Resistance
Unaffected by most vegetable and mineral oils, many organic compounds, and most common gases. Resistant to most aqueous solutions of inorganic salts and to dilute acids and alkalies. Suitability should always be tested before adoption for routine use.

Handling Precautions
Product safety information required for safe use is not included here. Before handling, consult safety data sheets and container labels for safe use, physical data, and health hazard information.

Typical Properties
Specification writers: Values are not intended for preparation of specifications. Contact your local Molykote sales representative before writing specifications for this product.

Standard(1)

Test

Unit

Result

 

Color

 

White to gray, translucent

 

Physical nature

 

Stiff compound

ISO 2137

Penetration, unworked

mm/10

170 to 230

ISO 2137

Penetration, worked 60, maximum

mm/10

<260

CTM 0033A A

Bleed, 24 hours; 200°C

%

<0.5

CTM 0033A B

Evaporation, 24 hours; 200°C

%

<2.0

 

Melting point

°C

None

Usable Life and Storage
When stored at or below 30°C in the original unopened containers, the product has a usable life of 60 months from the date of manufacture.

Packaging
Available in multiple standard container sizes. For detailed container options, contact your nearest Molykote sales office or authorized distributor.

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