LOCTITE 518

Harmonization Code : 3506.91.90.99 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg ; Adhesives based on polymers of headings 3901 to 3913 or on rubber; Other ; Other

LOCTITE 518

Main features

  • Anaerobic Thread Sealing
  • Gap-Filling Sealant Formulation
  • Thixotropic Application Control

Product Description

LOCTITE® 518™ is a single-component, medium-strength anaerobic flange sealant formulated for close-fitting rigid metal surfaces. The thixotropic red acrylic material cures when confined between mating metal faces in the absence of air and provides resistance to low pressures immediately after flange assembly. It seals gaps up to 0.25 mm and tolerates minor surface contamination from oils, including lubricating, anti-corrosion, and protection fluids. Typical uses include form-in-place gasketing of rigid metal flanges and casings, such as gearbox and engine assemblies.

Key features

  • Anaerobic flange sealing: Cures between close-fitting metal surfaces when isolated from air.
  • Gap-filling capability: Designed for flanged parts with gaps up to 0.25 mm.
  • Thixotropic consistency: Helps limit migration of the uncured material after application.
Product Family

LOCTITE 518

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Red gel-like material
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
1.1
Physical Properties
Viscosity
Viscosity is a measurement of a fluid’s resistance to flow. Viscosity is commonly measured in centiPoise (cP). One cP is defined as the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP. A product like honey would have a much higher viscosity -around 10,000 cPs- compared to water. As a result, honey would flow much slower out of a tipped glass than water would. The viscosity of a material can be decreased with an increase in temperature in order to better suit an application
4,000,000 mPa.s
Thermal Properties
Glass Transition Temperature (Tg)
The glass transition temperature for organic adhesives is a temperature region where the polymers change from glassy and brittle to soft and rubbery. Increasing the temperature further continues the softening process as the viscosity drops too. Temperatures between the glass transition temperature and below the decomposition point of the adhesive are the best region for bonding. The glass-transition temperature Tg of a material characterizes the range of temperatures over which this glass transition occurs.
100 °C
Mechanical Properties
Elongation
Elongation is the process of lengthening something. It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks. It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.
64 %

Additional Information

Technical properties

As-supplied / before-processing properties

Typical properties of the uncured material; values are reference data rather than guaranteed product specifications.

Property Value Unit Method / condition
Technology Acrylic — Uncured material
Chemical type Dimethacrylate ester — Uncured material
Appearance Red gel-like material — Uncured material
Fluorescence Positive — Under ultraviolet light
Specific gravity 1.1 — At 23°C
Viscosity 4,000,000 mPa·s Brookfield HBT, 25°C; spindle TC, 0.5 rpm, Helipath
Technical properties

After-processing / final-state properties

Typical cured-material properties depend on the stated cure schedule, substrate, specimen, and test method.

Property Value Unit Method / condition
Glass-transition temperature 100 °C ISO 11359-2; cured 24 hours at 23°C
Elongation at break 64 % ISO 527-2; cured 24 hours at 23°C
Tensile strength 7.3 N/mm² ISO 527-2; cured 24 hours at 23°C
Tensile modulus 54 N/mm² ISO 527-2; cured 24 hours at 23°C
Compressive shear strength 5 N/mm² ISO 10123; steel pins and collars; cured 24 hours at 23°C
Lap-shear strength 8.4 N/mm² ISO 4587; grit-blasted mild steel; cured 24 hours at 23°C
Maximum sealed induced gap 0.25 mm Annular gasket; mild steel or aluminum; cured 20 hours at room temperature

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