LOCTITE 4031

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 4031

Main features

  • Low-Odor Cyanoacrylate Adhesive
  • Low-Blooming Adhesive Cure
  • Medical-Device Bonding Applications

Product Description

LOCTITE® 4031™ is a one-component, high-viscosity alkoxyethyl cyanoacrylate adhesive developed for rapid bonding applications requiring low odor and low blooming performance. The transparent adhesive cures quickly upon exposure to ambient humidity and provides strong adhesion to metals, plastics and elastomers. Specifically designed for medical device assembly, LOCTITE 4031 has been evaluated using ISO 10993-based biocompatibility testing protocols, making it suitable for disposable medical device manufacturing. Its low-whitening characteristics, excellent sterilization resistance and dependable mechanical performance make it an ideal choice for sensitive and precision assembly applications.

Key Features & Benefits

  • Low-odor alkoxyethyl cyanoacrylate formulation.
  • Low blooming (low whitening) for clean, aesthetic bond lines.
  • One-component adhesive requiring no mixing.
  • Fast curing through exposure to ambient humidity.
  • Suitable for disposable medical device assembly.
  • Tested according to ISO 10993-based biocompatibility protocols.
  • Excellent resistance to common sterilization processes.

Recommended Applications

  • Disposable medical device assembly.
  • Bonding metals, plastics and elastomers.
  • Applications requiring low odor and low blooming performance.
  • Precision assembly of small components.
  • Medical and industrial manufacturing environments.
Product Family

LOCTITE 4031

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Transparent, colorless to pale 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.
1.1
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
1,100 - 1,650 mPa.s

Additional Information

Technical Properties

As-Supplied / Before-Processing Properties

Property Value Unit Condition
Technology Cyanoacrylate — Humidity-cure adhesive
Chemical Type Alkoxyethyl Cyanoacrylate — Low odor formulation
Appearance Transparent, Colorless to Pale Yellow Liquid — Uncured
Components One Component — No mixing required
Specific Gravity 1.1 — 25°C
Viscosity 1,100 - 1,650 mPa·s (cP) Brookfield LVF, Spindle 2, 12 rpm, 25°C
Key Substrates Metals, Plastics and Elastomers — Typical bonding applications
Cure Mechanism Humidity Activated — Ambient moisture cure
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 (Buna-N) ≥4.5 N/mm² ISO 6922, 24 h @ 22°C

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