Applications

LOCTITE® 438™ – Rubber-Toughened Instant Adhesive – Bonding metals, plastics, elastomers, porous materials in industrial manufacturing applications

  • Item Name: LOCTITE® 438™
  • Manufacturer: Henkel
  • Product Category: Instant Adhesives
  • Technologies: Cyanoacrylate (Ethyl cyanoacrylate)
  • Applications: Bonding metals, plastics, rubbers, and porous/absorbent materials such as wood, paper, leather, and fabric
  • Color: Black liquid
  • Cure Type: Humidity cure
  • Package Size: Contact Techniq VN for details
  • Shelf Life: Contact Techniq VN for details

1. Product Overview

LOCTITE® 438™ is a black, rubber-toughened ethyl cyanoacrylate adhesive designed for increased flexibility, peel strength, and shock resistance. It provides rapid bonding on various substrates, including metals, plastics, elastomers, and porous materials such as wood, paper, leather, and fabric.


2. Applications

  • Suitable for bonding metals, plastics, rubbers, and porous materials
  • Used in applications requiring high impact resistance and flexibility
  • Works well with thin bond gaps (0.05 mm)

3. Typical Properties

Property Value
Uncured Properties
Specific Gravity @ 25°C 1.1
Viscosity (mPa·s) 100 – 250
Cure Mechanism Humidity
Curing Performance
Fixture Time (Steel) 30 – 45 sec
Fixture Time (Aluminum) ≤60 sec
Fixture Time (Rubber, Nitrile) <5 sec
Full Cure Time 24 hours
Cured Properties
Glass Transition Temperature 130°C
Coefficient of Thermal Expansion 80 × 10⁻⁶ K⁻¹
Thermal Conductivity 0.1 W/(m·K)
Adhesion Strength (ISO 4587, 24h @ 22°C)
Steel (grit blasted) 19 N/mm² (2800 psi)
Aluminum 18 N/mm² (2600 psi)
ABS 10 N/mm² (1500 psi)
PVC 12 N/mm² (1800 psi)
G-10 Epoxy 20 N/mm² (2900 psi)
Environmental Resistance (72h @ 22°C)
Motor Oil (40°C) 100% Strength Retention
Gasoline (22°C) 95% Strength Retention
Ethanol & Isopropanol (22°C) 100% Strength Retention
Heat & Humidity (95% RH, 40°C) 95 – 100% Strength Retention

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