LOCTITE 498
Harmonization Code : 3919.10.80 | Other self-adhesive plastic rolls not exceeding 20 cm wide.
Main features
- General-Purpose Cyanoacrylate Adhesive
- Cured Thermal-Cycling Resistance
- Cured Humidity Resistance
Product Description
LOCTITE® 498™ is a one-component, medium-viscosity ethyl cyanoacrylate adhesive designed for general-purpose bonding applications requiring elevated temperature resistance and excellent humidity durability. The adhesive rapidly bonds metals, plastics and elastomers through moisture curing and is formulated to withstand thermal cycling while maintaining reliable bond strength. Its combination of fast fixture speed, high glass transition temperature and good environmental resistance makes it suitable for demanding industrial assembly applications where long-term performance under heat exposure is required.
- General-purpose cyanoacrylate adhesive with enhanced heat resistance.
- Excellent resistance to thermal cycling.
- Superior humidity resistance compared with standard formulations.
- Rapid humidity-cure technology.
- One-component system requiring no mixing.
- Bonds rubbers, plastics and metals.
- Suitable for applications requiring elevated-temperature performance.
Recommended Applications
- General industrial bonding operations.
- Assemblies exposed to heat and thermal cycling.
- Bonding metals, rubbers and engineering plastics.
- Applications requiring humidity resistance.
- Precision assembly with close-fitting bond lines.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Appearance
Transparent, colorless to pale yellow liquid
Appearance at room temperature.
Specific Gravity
1.1
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.
Physical Properties
Viscosity
400 - 600 mPa.s
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
Thermal Properties
Glass Transition Temperature (Tg)
120 °C
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.
Thermal Conductivity
0.1 W/m.K
Thermal conductivity describes the ability of a material to conduct heat. It is required by power packages in order to dissipate heat and maintain stable electrical performance.
Thermal conductivity units are [W/(m K)] in the SI system and [Btu/(hr ft °F)] in the Imperial system.
Electrical Properties
Volume Resistivity
10e+15 Ohms⋅cm
Volume resistivity, also called volume resistance, bulk resistance or bulk resistivity is a thickness dependent measurement of the resistivity of a material perpendicular to the plane of the surface.
Additional Information
Technical Properties
As-Supplied / Before-Processing Properties
| Property | Value | Unit | Condition |
|---|---|---|---|
| Technology | Cyanoacrylate | — | Heat-resistant instant adhesive |
| Chemical Type | Ethyl Cyanoacrylate | — | One-component formulation |
| Appearance | Transparent, Colorless to Pale Yellow Liquid | — | Uncured material |
| Components | One Part | — | No mixing required |
| Specific Gravity | 1.10 | — | 25°C |
| Viscosity | 400 - 600 | mPa·s (cP) | Brookfield LVF, Spindle 2, 30 rpm, 25°C |
| Key Substrates | Rubbers, Plastics, Metals | — | Recommended bonding materials |
| Cure Mechanism | Humidity Cure | — | Atmospheric moisture activated |
Technical Properties
After-Processing / Final-State Properties
| Property | Value | Unit | Condition / Method |
|---|---|---|---|
| Glass Transition Temperature (Tg) | 120 | °C | ASTM E228 |
| Coefficient of Thermal Expansion | 80 × 10⁻⁶ | K⁻¹ | ISO 11359-2 |
| Thermal Conductivity | 0.10 | W/(m·K) | ISO 8302 |
| Volume Resistivity | 10 × 10¹⁵ | Ω·cm | IEC 60093 |
| Dielectric Breakdown Strength | 25 | kV/mm | IEC 60243-1 |
| Dielectric Constant / Dissipation Factor | 2.3 / <0.02 | — | 0.05 kHz to 1,000 kHz |
| Lap Shear Strength (Steel) | 19 | N/mm² | ISO 4587, 24 h cure at 22°C |
| Lap Shear Strength (Polycarbonate) | 10 | N/mm² | ISO 4587, 24 h cure |
| Lap Shear Strength (Phenolic) | 10 | N/mm² | ISO 4587, 24 h cure |
| Heat-Aged Lap Shear Strength (Steel) | ≥6.9 | N/mm² | After 24 h cure + 24 h at 121°C, tested at 121°C |
| Initial Lap Shear Strength (Steel) | ≥4.8 |
