LOCTITE 5188

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 5188

Main features

  • Flexible Cured Sealing
  • Strong Aluminum Adhesion
  • High-Viscosity Placement Control

Product Description

LOCTITE® 5188™ is a single-component, medium-strength anaerobic form-in-place gasketing product for close-fitting rigid metal flange connections. It cures between mating metal surfaces in the absence of air and is particularly suited to aluminum substrates. The flexible formulation maintains flexibility after high-temperature exposure, tolerates minor oil contamination on flange surfaces, and provides resistance to low pressures immediately after assembly. Typical uses include sealing gearboxes, engine casings, and other rigid metal flanged assemblies.

Key features

  • Flexible flange sealing: Maintains flexibility after exposure to elevated temperatures.
  • Aluminum performance: Provides strong adhesion on close-fitting aluminum flange surfaces.
  • One-component application: Requires no mixing and can be dispensed manually or with automated equipment.
Product Family

LOCTITE 5188

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Red viscous product
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
11,000 - 32,000 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.
105 °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.
186 %

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 viscous product — Uncured material
Components One component — No mixing required
Fluorescence Positive — Under ultraviolet light
Specific gravity 1.1 — At 25°C
Viscosity 11,000–32,000 mPa·s Cone and plate, 25°C; PK 100, PK 1, 2° cone at 20 s⁻¹
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 105 °C Typical cured-material property
Elongation at break 186 % Typical cured-material property
Tensile strength at break 4.24 N/mm² Typical cured-material property
Tensile modulus 4.17 N/mm² Typical cured-material property
Lap-shear strength 9.2 N/mm² Grit-blasted mild steel; cured 72 hours at 22°C
Lap-shear strength 7.0 N/mm² Aluminum; cured 72 hours at 22°C
Lap-shear strength 7.8 N/mm² Grit-blasted mild steel; cured 168 hours at 22°C
Lap-shear strength 8.0 N/mm² Aluminum; cured 168 hours at 22°C
Maximum sealed induced gap 0.25 mm Annular gasket on mild steel; tested to 1.3 MPa after curing

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