MOLYKOTE High Vacuum Grease Silicone Lubricant 150g

Product Overview

MOLYKOTE High Vacuum Grease is a stiff, translucent white silicone compound developed for sealing and lubricating vacuum systems, pressure equipment, valves and laboratory glassware. Formulated with high-purity silicone oil and a silica thickener, it helps create a sealing layer between compatible mating surfaces while reducing friction during assembly and operation.

Its low-volatility characteristics make it suitable for selected vacuum applications, while its resistance to water, mineral oils, vegetable oils and various common gases supports use in laboratory and industrial maintenance. This silicone vacuum grease is also suitable for selected O-rings, gaskets, ground-glass joints and plastic-to-metal or rubber-to-metal interfaces, provided the materials are compatible.

With a stated service temperature range of -40°C to +204°C, MOLYKOTE High Vacuum Grease can be considered for applications requiring sealing performance across changing temperatures.

Key Features and Benefits

• Vacuum System Sealing: Helps seal compatible ground-glass joints, stopcocks, O-rings and vacuum connections.

• Low Volatility: Designed for applications where reduced lubricant volatility is important; verify the vacuum requirements of the specific system.

• Water Resistance: Resists water and supports sealing applications exposed to moisture.

• Chemical Resistance: Offers resistance to mineral oils, vegetable oils, common gases and dilute acids or alkalis, subject to compatibility testing.

• Friction Reduction: Helps reduce friction and wear at compatible plastic-to-metal and rubber-to-metal interfaces.

• Wide Temperature Range: Stated operating range from -40°C to +204°C.

• Silicone-Based Formulation: Uses high-purity silicone oil and silica thickener.

• Laboratory and Industrial Versatility: Suitable for selected glass joints, valves, gaskets and sealing components.

Technical Specifications

• Product Type: Silicone Vacuum Grease / Sealing Compound

• Package Size: 150g Tube

• Base Oil: High-Purity Silicone Oil

• Thickener:Silica

• Color and Appearance: Translucent White

• Consistency: Stiff Compound

• NLGI Consistency: Reported as Grade 3–4; verify the official product specification

• Operating Temperature: -40°C to +204°C

• Food Contact: Reported to meet FDA 21 CFR 175.300 requirements; verify the current manufacturer's compliance documentation for the exact product

• Primary Functions: Vacuum Sealing, Lubrication, Friction Reduction and Moisture Resistance

Typical Applications

Vacuum Systems and Laboratory Glassware

Suitable for compatible stopcocks, ground-glass joints, vacuum connections and O-rings where sealing and low volatility are required.

Valves and Gaskets

Can be considered for compatible plug valves, control valves, fire extinguisher valves and synthetic rubber sealing components, subject to the equipment manufacturer's recommendations.

Pressure Systems

Used in selected pressure-system connections and seals where the compound is compatible with the working medium, pressure range and sealing materials.

Plastic-to-Metal and Rubber-to-Metal Interfaces

Helps reduce friction and wear between compatible dissimilar materials in moving assemblies and sealing interfaces.

Laboratory and Industrial Maintenance

Suitable for selected maintenance tasks involving glass joints, valves, seals and equipment requiring a silicone-based sealing compound.

Chemical Compatibility and Limitations

Compatible Media

Based on the supplied product information, the grease resists water, mineral oils, vegetable oils, common gases and dilute acids or alkalis. Actual compatibility depends on the concentration, temperature, exposure duration and materials involved.

Materials and Applications Requiring Caution

• Liquid Oxygen (LOX): Do not use in liquid oxygen service.

• Silicone Elastomers: Avoid use with silicone rubber unless the manufacturer confirms compatibility for the specific application.

• Electron Microscope Columns: Do not use in these applications where the grease is specifically unsuitable.

• Plastics and Rubber: Test the exact material grade and service conditions before use.

Food-Contact Applications

Do not assume that every product or application is food-contact approved solely because FDA 21 CFR 175.300 is referenced. Confirm the applicable manufacturer documentation and the requirements for the intended use.

Handling and Storage

• Apply a suitable amount to clean, compatible surfaces according to the equipment manufacturer's instructions.

• Prevent contamination of vacuum systems and precision equipment during application.

• Keep the container tightly closed when not in use.

• Store in accordance with the manufacturer's recommended temperature and environmental conditions.

• Consult the current technical data sheet (TDS) and safety data sheet (SDS) for detailed handling, storage and disposal instructions.

Why Choose MOLYKOTE High Vacuum Grease?

MOLYKOTE High Vacuum Grease combines silicone-based lubrication with sealing capability for selected vacuum systems, laboratory glassware and industrial valves. Its low-volatility characteristics, water resistance and broad temperature range make it a useful option for compatible sealing interfaces where conventional lubricants may not provide the required performance.

Before selecting the product, confirm the vacuum level, operating temperature, pressure, working medium and compatibility with the specific seal or glass material.

Package: 150g Tube

Important: Verify the exact product designation, package size, temperature range, vapor pressure and food-contact claims against the current manufacturer technical data sheet (TDS) and relevant compliance documentation.