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LOCTITE® 640
Loctite® 640 is a high-strength, low-viscosity anaerobic retaining compound designed for bonding cylindrical fitting parts. Its slow cure time makes it ideal for applications requiring longer positioning times, such as large diameter components or assemblies involving active metals like brass.
Loctite® 640 is formulated to provide robust bonding for cylindrical assemblies, including keys, splines, bearings, and bushings. It cures in the absence of air between close-fitting metal surfaces, forming a durable bond that resists shock and vibration. The product’s extended cure time allows for precise alignment during assembly, making it suitable for components that require careful positioning. With a fixture time of approximately 2 hours and a service temperature range of -55°C to +175°C, it delivers reliable performance in demanding applications.
Specifications
Colour: Green Viscosity: 450 to 750 mPa·s Fixture Time: Approximately 2 hours on steel Full Cure Time: 24 hours Service Temperature Range: -55°C to +175°C Maximum Diametrical Clearance: 0.1 mm Shear Strength (Steel): 22 N/mm² Fluorescence: Yes (for UV inspection) Recommended Substrates: Steel, brass, and other active metals Packaging Sizes: 50 ml and 250 ml bottles
Primary Chemistry: Methacrylate ester
Features & Benefits
High-strength bonding ensures permanent retention of cylindrical parts Low-viscosity formulation allows for easy application and penetration into tight fitting parts Extended cure time facilitates precise alignment and positioning during assembly Resistant to shock, vibration, and thermal cycling, ensuring long-term reliability Fluorescent under UV light for easy inspection
Problems Solved
Provides reliable bonding for large diameter or complex assemblies requiring extended positioning time Eliminates the need for mechanical locking devices, simplifying assembly processes Prevents loosening and leakage in cylindrical assemblies due to shock and vibration Reduces maintenance requirements by providing durable, long-lasting bonds
Applications
Ideal for bonding cylindrical parts such as keys, splines, bearings, and bushings in assemblies requiring extended positioning time Suitable for applications involving large diameter components or active metals like brass Effective on various metals, including less active substrates Can be used in industries such as automotive, manufacturing, and maintenance operations where precise alignment is critical
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Thank you
Thank you for your inquiry and interest in ChemPoint. We will respond to you shortly.
ChemPoint will not under any circumstances release personal user information to individuals or companies. All information collection is solely used to support ChemPoint customers service communications. Read our Privacy Notice.
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