LOCTITE 4861

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 4861

Main features

  • Flexible Cured Adhesive
  • Rapid Humidity Cure
  • Medium-Viscosity Application Control

Product Description

LOCTITE® 4861™ is a one-component ethyl/butyl cyanoacrylate adhesive specifically formulated to create flexible bond lines while maintaining rapid curing performance. The medium-viscosity adhesive is designed for bonding difficult-to-bond materials including metals, plastics and elastomers, and is especially effective when joining rubber components where joint compressibility must be maintained. It also performs well on porous and absorbent substrates such as paper, leather and fabrics. LOCTITE 4861 has been evaluated to Henkel test protocols based on ISO 10993 biocompatibility standards and is suitable for use in disposable medical device assembly applications.

Key Features & Benefits

  • Flexible bond-line formulation for improved joint performance.
  • Rapid humidity-cure cyanoacrylate technology.
  • Maintains compressibility in bonded rubber assemblies.
  • Suitable for metals, plastics, elastomers and porous materials.
  • Medium viscosity for controlled application.
  • One-component formulation requiring no mixing.
  • Evaluated to ISO 10993-based biocompatibility protocols for medical device use.

Recommended Applications

  • Disposable medical device assembly.
  • Rubber-to-metal and rubber-to-plastic bonding.
  • Flexible bonding applications requiring shock absorption.
  • Bonding paper, leather and fabric materials.
  • General industrial assembly of metals, plastics and elastomers.
Product Family

LOCTITE 4861

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Clear colorless liquid
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.
1.05
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
3,000 - 5,500 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.
60 °C
Electrical Properties
Surface Resistivity
1e+15 Ohms/sq
Volume Resistivity
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.
158e+12 Ohms⋅cm

Additional Information

Technical Properties

As-Supplied / Before-Processing Properties

Property Value Unit Condition
Technology Cyanoacrylate — Flexible instant adhesive
Chemical Type Ethyl / Butyl Cyanoacrylate — Flexible bonding formulation
Appearance Clear Colorless Liquid — Uncured
Components One Part — No mixing required
Specific Gravity 1.05 — 25°C
Viscosity 3,000 - 5,500 mPa·s (cP) Cone & Plate, 25°C, 50 s⁻¹
Key Substrates Steel, Polycarbonate, ABS — Typical 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) 60 °C ASTM E228
Coefficient of Thermal Expansion 100 × 10⁻⁶ K⁻¹ ISO 11359-2
Shore Hardness 80 - 90 Shore A ISO 868
Tensile Modulus 280 - 580 N/mm² ISO 527-3
Volume Resistivity 158 × 10¹² Ω·cm IEC 60093
Surface Resistivity >1 × 10¹⁵ Ω IEC 60093
Lap Shear Strength (Steel) 11 - 17 N/mm² ISO 4587, 7 days cure
Lap Shear Strength (Aluminum) 8 - 12 N/mm² ISO 4587, grit blasted
Lap Shear Strength (ABS) 5 - 9 N/mm² ISO 4587
Lap Shear Strength (Polycarbonate) 6 - 8 N/mm² ISO 4587

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