LOCTITE 4081

Harmonization Code : 3506.10.00.00 | 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

LOCTITE 4081

Main features

  • Very-Low-Viscosity Cyanoacrylate Adhesive
  • Low-Odor Adhesive Cure
  • Disposable Medical-Device Assembly

Product Description

LOCTITE® 4081™ is a one-component, very low-viscosity alkoxyethyl cyanoacrylate adhesive designed for ultra-fast bonding of metals, plastics and elastomers. The adhesive combines low odor and low blooming characteristics with rapid humidity-cure performance, making it especially suitable for applications where vapor control and appearance are critical. LOCTITE 4081 has been evaluated using ISO 10993-based biocompatibility protocols and is widely used in the assembly of disposable medical devices. Its excellent sterilization resistance, fast fixture speed and clean bonding performance make it ideal for medical and precision manufacturing environments.

Key Features & Benefits

  • Very low-viscosity alkoxyethyl cyanoacrylate formulation.
  • Low odor and low blooming properties.
  • One-component adhesive requiring no mixing.
  • Fast curing through ambient humidity exposure.
  • Suitable for disposable medical device assembly.
  • Tested according to ISO 10993-based biocompatibility protocols.
  • Excellent performance after common sterilization processes.

Recommended Applications

  • Disposable medical device manufacturing.
  • Bonding metals, plastics and elastomers.
  • Precision assemblies requiring low blooming.
  • Applications requiring ultra-fast fixture speed.
  • Medical and industrial production lines.
Product Family

LOCTITE 4081

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Transparent, colorless yellow 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
4 - 10 mPa.s

Additional Information

Technical Properties

As-Supplied / Before-Processing Properties

Property Value Unit Condition
Technology Cyanoacrylate — Alkoxyethyl cyanoacrylate adhesive
Chemical Type Alkoxyethyl Cyanoacrylate — Low odor formulation
Appearance Transparent, Colorless to Light Yellow Liquid — Uncured
Components One Part — No mixing required
Specific Gravity 1.05 — 25°C
Viscosity 4 - 10 mPa·s (cP) Brookfield LVF, Spindle 1, 60 rpm, 25°C
Key Substrates Metals, Plastics and Elastomers — Primary bonding materials
Cure Type Humidity Cure — Atmospheric moisture activated
Technical Properties

After-Processing / Final-State Properties

Property Value Unit Condition / Method
Glass Transition Temperature (Tg) 150 °C ASTM E228
Coefficient of Thermal Expansion 100 × 10⁻⁶ K⁻¹ ISO 11359-2
Thermal Conductivity 0.1 W/m·K ISO 8302
Volume Resistivity 10 × 10¹⁵ Ω·cm IEC 60093
Surface Resistivity 10 × 10¹⁵ Ω IEC 60093
Dielectric Breakdown Strength 25 kV/mm IEC 60243-1
Lap Shear Strength (Steel, Grit Blasted) 14 - 22 N/mm² ISO 4587, 24 h @ 22°C
Lap Shear Strength (Aluminum) 9 - 15 N/mm² ISO 4587, Etched Aluminum
Tensile Strength (Steel) 10 - 25 N/mm² ISO 6922, 24 h @ 22°C
Tensile Strength (Buna‑N) ≥4.5 N/mm² ISO 6922, 10 s @ 22°C

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