Brief Introduction
LOCTITE 518 is a premium primerless anaerobic flange sealant engineered specifically for aluminum substrates and flexible flanges. Designed to deliver reliable, long-lasting sealing performance in industrial settings, this high-quality sealant eliminates the need for time-consuming primer application while ensuring a tight bond on metal surfaces. Whether used in heavy-duty machinery or precision assemblies, it provides immediate resistance to low pressure after flange assembly, making it a go-to choice for engineers and maintenance professionals seeking efficiency and durability. Its unique formula combines versatility and strength, adapting to the demands of various industrial applications without compromising on seal integrity.
| Application method | Dispense system, Manual |
| Applications | Rigid assembly gasketing, Sealing |
| Chemical basis / base | Dimethacrylate ester |
| Color | Red |
| Cure type | Anaerobic cure |
| Fixture time, Steel | 25.0 min. |
| Gap fill, Unprimed | 0.25 mm |
| Key characteristics | Fluorescent, For machined, rigid flanges, Immediate low pressure sealing, Strength: medium strength, Surface contamination-tolerant, Thixotropic |
| Number of components | 1 part |
| Operating temperature | -55.0 - 150.0 °C (-65.0 - 300.0 °F ) |
| Physical form | Gel |
| Recommended for use with | Metal: aluminum, Metal: iron - cast iron, Metal: passive metal, Metal: steel |
| Specific gravity, @ 25.0 °C | 1.1 |
| Storage temperature | 8.0 - 21.0 °C |
| Viscosity | 750000.0 mPa·s (cP)
|
Core Features
Primerless Application
The primerless design of LOCTITE 518 streamlines the sealing process, allowing direct application to clean metal surfaces without pre-treatment. This not only saves valuable time during assembly but also reduces material costs associated with primers.
Fluorescent Characteristic
Equipped with a fluorescent property, this flange sealant enables easy inspection of seal coverage and integrity under UV light. This feature is particularly useful for quality control, ensuring no gaps or missed areas in critical assemblies.
Surface Contamination Tolerance
LOCTITE 518 exhibits excellent surface contamination tolerance, maintaining effective sealing even on slightly oily or dusty metal surfaces. This resilience minimizes the need for rigorous surface cleaning, enhancing workflow efficiency.
Thixotropic Formula
Its thixotropic formula prevents dripping during application, making it suitable for both vertical and horizontal flange surfaces. The gel-like consistency ensures precise placement and uniform coverage.
Medium-Strength Bond
Offering a medium-strength bond, the sealant balances secure sealing with the ability to disassemble components for maintenance or repairs. This flexibility is ideal for assemblies that require periodic servicing.
Compatibility with Multiple Metals
While optimized for aluminum substrates, LOCTITE 518 also works seamlessly with steel, cast iron, and other passive metals. Expanding its utility across diverse industrial setups.
Typical Uses
As a high-performance forming gasket alternative, it replaces traditional gaskets in rigid assemblies, providing a custom-fit seal that adapts to flange irregularities.
Ideal for sealing pumps, compressors, and their housings, LOCTITE 518 prevents fluid leaks in hydraulic and pneumatic systems, ensuring consistent machinery performance.
Used in thermostat housings and gearbox assemblies, it protects internal components from moisture, dust, and debris while withstanding temperature fluctuations.
Suitable for axle covers and similar automotive or industrial components, the sealant resists vibration and mechanical stress, maintaining a leak-proof seal in dynamic environments.
Effective for metal piping systems, it seals flange connections in fluid and gas transfer lines, reducing the risk of costly leaks and downtime.
FAQ
What substrates is LOCTITE 518 compatible with?
LOCTITE 518 is optimized for aluminum substrates and also works with steel, cast iron, and other passive metals commonly used in industrial assemblies.
Do I need a primer with this anaerobic flange sealant?
No, it features a primerless design that allows direct application to clean metal surfaces, eliminating the need for additional primers.
Is it suitable for flexible flanges?
Yes, LOCTITE 518 is specifically engineered for flexible flanges, adapting to minor flange movements without compromising the seal.
Can it be used for high-pressure applications?
While it provides immediate low-pressure sealing, it is best suited for medium-pressure systems. Consult the product specifications for high-pressure application guidelines.
How should I dispose of unused LOCTITE 518?
Dispose of unused product and packaging in accordance with local environmental laws. Refer to the chemical safety data sheet for specific disposal instructions to minimize environmental impact.
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