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LOCTITE® 518™
LOCTITE® 518™ is a reliable gasketing solution that provides medium-strength sealing for flange surfaces with excellent contamination tolerance. This anaerobic adhesive sealant eliminates the need for traditional gaskets by forming a flexible, solvent-resistant seal. It fills gaps, withstanding vibrations commonly caused during operation, and can be easily disassembled when needed. It is ideal for use on casted iron, steel, and aluminum flanges traditionally used in industrial, aerospace, and automotive applications.
- Manufacturer: Henkel
- Product Line: LOCTITE® Gasketing Sealants
- Product: LOCTITE® Anaerobic Flange Sealants
- Industries: Adhesives | Coatings | Facility Infrastructure | Maintenance, Repair, Overhaul | Metal Processing & Fabrication | Transportation
- Authorized Countries: Canada | Mexico | United States
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Overview
LOCTITE® 518™ is a single-component gasketing solution designed specifically for creating strong, durable seals between flange surfaces. It is a flexible, anaerobic adhesive that cures in the absence of air and the presence of metal ions and minor surface contaminations from oils, such as lubrication, cutting, anti-corrosion, and protection fluids. LOCTITE® 518™ eliminates the need for traditional gaskets by filling surface imperfections and gaps up to 0.25 mm, providing a flexible and solvent-resistant seal. This gasketing solution offers exceptional physical properties, ensuring a tight and leak-free seal that can withstand vibrations, fluid pressure, and extreme temperatures ranging from -55.0°C–150.0°C (-65.0°F–300.0°F). It also provides medium-strength bonding, allowing for easy disassembly of sealed components when necessary and making maintenance and repairs more convenient.
Specifications
Chemical Type: Dimethacylate ester
Appearance (uncured): Red, gel-like material
Fluorescence: Positive under UV light
Viscosity: Thixotropic
Viscosity, Brookfield, 25°C, mPa·s (cP) (Spindle TC, speed 0.5 rpm): 4,000,000
Cure: Anaerobic
Secondary cure: Activator
Strength: Medium
Specific gravity @ 23°C 1.1
Elongation, at break, ISO 527-2, %: 64
Tensile strength, ISO 527-2 N/mm² (psi): 7.3 (1,060)
Tensile modulus, ISO 527-2 N/mm² (psi): 54 (7,850)
Temperature/humidity ranges: 23 °C / 50% RH = 23+2 °C / 50+5% RH
Primary Chemistry: Dimethylacrylate ester
Features & Benefits
Anaerobic gasketing solution
Medium-strength
Excellent contamination tolerance
Excellent chemical-resistant seal
Forms a flexible seal that will flex with minor flange movements
Resistance to low pressures immediately after assembly of flanges
Temperature resistance of -65°F to 300°F
Suitable for gaps up to 0.25 mm
Will not tear or decay
Gel-type consistency
Resists high pressure with fully cured
Easy to automate
Problems Solved
Compression set or misaligned gaskets
The need for precut gaskets
Leaks caused by vibration, pressurization, and thermal expansion
Poor adhesions to plastic substrates, glass, ceramics, or metals
Manual assembly of conventional gaskets
Applications
Ideal for use on casted iron, steel, and aluminum flanges
Forming in-place gaskets for pumps, thermostats, compressors, transmission housings, and axle covers
Gasketing of machined, rigid metal flanges
Sealing close-fitting joints between rigid metal faces and flanges
Related Applications
Adhesives
Coatings
Maintenance, Repair, Overhaul
Related End Markets
Facility Infrastructure
Maintenance, Repair, Overhaul
- Energy Generation & Utility
- Facility Infrastructure
- General Industrial
- Heavy Industry
- Metal Processing & Fabrication
- Oil & Gas
- Pulp & Paper
- Transportation
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