Applications

LOCTITE® 431™

  • Item Name: LOCTITE® 431™
  • Manufacturer: Henkel
  • Product Category: Instant Adhesives
  • Technologies: Cyanoacrylate (Ethyl cyanoacrylate)
  • Applications: Bonding metals, plastics, elastomers, and porous materials
  • Color: Transparent, colorless to straw-colored liquid
  • Cure Type: Humidity cure
  • Package Size: Contact Avantek for details
  • Shelf Life: Contact Avantek for details

1. Product Overview

LOCTITE® 431™ is a medium-viscosity, one-part ethyl cyanoacrylate adhesive that cures with humidity. It is designed for strong tension and shear strength bonding across metals, plastics, elastomers, and porous materials such as wood, paper, leather, and fabric. It meets ISO-10993 biocompatibility standards for medical device applications.

2. Applications

  • Bonding metals, plastics, and elastomers
  • Assembly of difficult-to-bond materials requiring uniform stress distribution
  • Bonding porous materials (wood, paper, leather, fabric)
  • Suitable for medical devices (ISO-10993 tested)

3. Typical Properties

Property Value
Uncured Properties
Specific Gravity @ 25°C 1.07
Viscosity (mPa·s) @ 25°C 600 – 1,200 (Cone & Plate)
Viscosity (Brookfield LVF) 800 – 1,200 (Spindle 2, Speed 6 rpm)
Cured Properties
Coefficient of Thermal Expansion (K⁻¹) 364×10⁻⁶
Thermal Conductivity (W/m·K) 0.3
Glass Transition Temperature (°C) 183
Electrical Properties
Volume Resistivity (Ω·cm) 10.9×10¹⁵
Surface Resistivity (Ω) 1.0×10¹⁵
Dielectric Breakdown Strength (kV/mm) 25
Curing Performance Cures with ambient moisture; full strength in 24 hours
Fixture Time (Steel) 180 – 300 sec
Fixture Time (Aluminum) 10 – 15 sec
Fixture Time (Polycarbonate) 5 – 10 sec

4. Typical Performance of Cured Material

Property Value (N/mm²) Value (psi)
Tensile Strength (ISO 6922)
Buna-N Rubber ≥6 ≥870
Steel (grit blasted) 13 – 20 1,900 – 2,900
Lap Shear Strength
Steel (grit blasted) 25 – 31 3,600 – 4,500
Aluminum (etched) 13 – 24 1,900 – 3,500
ABS 8 – 11 1,200 – 1,600
Polycarbonate 7 – 11 1,000 – 1,600

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