Applications

LOCTITE® 420 – Cyanoacrylate Adhesive – Bonding metals, rubbers, plastics; rapid curing for close-fitting parts.

  • Item Name: LOCTITE® 420
  • Manufacturer: Henkel
  • Product Category: Instant Adhesives
  • Technologies: Cyanoacrylate
  • Applications: Bonding plastics, rubbers, and metals
  • Color: Transparent, colorless to straw-colored liquid
  • Cure Type: Humidity cure
  • Package Size: Contact Techniq VN for details
  • Shelf Life: Contact Techniq VN for details

1. Product Overview

LOCTITE® 420 is a general-purpose cyanoacrylate instant adhesive with very low viscosity, designed for fast bonding of plastics, rubbers, and metals. It is a single-component adhesive that cures upon exposure to atmospheric humidity.

2. Applications

  • Bonding plastics, rubbers, and metals
  • Used in applications requiring rapid fixture times
  • Suitable for general-purpose industrial bonding

3. Typical Properties

Uncured Properties
Property Value
Chemical Type Ethyl cyanoacrylate
Appearance Transparent, colorless to straw-colored liquid
Specific Gravity @ 25°C 1.05
Viscosity (mPa·s) 1 to 5 (Brookfield LVF)
Vapor Pressure (hPa) <1
Flash Point See SDS
Curing Performance
Substrate Fixture Time (seconds)
Mild Steel (degreased) 10 to 30
Aluminum (degreased) 5 to 15
Zinc Dichromate 30 to 90
Neoprene, Nitrile Rubber <5
ABS, Phenolic 10 to 30
PVC 3 to 10
Polycarbonate 20 to 60
Cured Properties (After 24 hours @ 22°C)
Property Value
Coefficient of Thermal Expansion 100×10⁻⁶ K⁻¹
Thermal Conductivity 0.1 W/(m·K)
Softening Point 165°C
Dielectric Breakdown Strength 25 kV/mm
Volume Resistivity 2×10¹⁵ to 10×10¹⁵ Ω·cm
Surface Resistivity 10×10¹⁵ to 80×10¹⁵ Ω
Adhesive Performance (Lap Shear Strength @ 22°C)
Substrate Strength (N/mm²) (psi)
Steel (grit blasted) 15 to 26 (2,175 to 3,770)
Aluminum (grit blasted) 12 to 19 (1,740 to 2,755)
ABS, PVC, Polycarbonate 6 to 20 (870 to 2,900)
Phenolic, Neoprene, Nitrile 5 to 20 (725 to 2,900)
Environmental Resistance
  • Chemical Resistance: Retains over 95% strength in motor oil, gasoline, ethanol, and isopropanol after 1,000 hours.
  • Humidity Resistance: At 95% RH and 40°C, strength retention decreases to 65% after 1,000 hours.

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