Applications

LOCTITE® AA 331

  • Item Name: LOCTITE® AA 331
  • Manufacturer: Henkel
  • Product Category: Acrylic Adhesive
  • Technologies: Modified acrylic, one-component, activator-cured, secondary heat cure
  • Applications: Bonding metals, DC motor assembly, magnet bonding, pre-coated sheet metal
  • Color: Light yellow to sand yellow (uncured)
  • Cure Type: Activator cure, secondary heat cure
  • Package Size: Contact Techniq VN for details
  • Shelf Life: Contact Techniq VN for details

1. Product Overview

  • Technology: Modified Acrylic
  • Type: One-component, medium-viscosity adhesive
  • Curing Method: Activator-cured, with secondary heat cure option
  • Color (Uncured): Light yellow to sand yellow paste
  • Key Benefits:
    • Non-corrosive
    • Rapid room temperature cure
    • High temperature resistance
    • High shear & impact strength

2. Applications

  • Ideal for:
    • Bonding metal substrates
    • DC motor assembly
    • Magnet bonding
    • Pre-coated sheet metal bonding
  • Not recommended for:
    • Pure oxygen/oxygen-rich systems
    • Chlorine or strong oxidizers
    • Plastics (risk of stress cracking)

3. Typical Properties

Uncured Properties
Property Value
Specific Gravity @ 23°C 1.08
Viscosity (mPa·s @ 25°C, 5 s⁻¹) 19,000
Curing Performance
  • Fixture Time (23°C, Activator 7387™ on 1 side):
    • 0.05 mm gap: 17 sec
    • 0.127 mm gap: 67 sec
    • 0.25 mm gap: 142 sec
  • Full Strength Development: 24–72 hours depending on conditions
Cured Properties (48h @ 23°C + 3h @ 80°C)
Property Value
Glass Transition Temperature (Tg, °C) 64
Shore Hardness (Durometer D) 86
Water Absorption (% in boiling water) 0.78
Linear Shrinkage (%) 2.4
Volume Shrinkage (%) 7.1
Elongation at Break (%) 3.0
Tensile Strength (N/mm²) 11 (1,600 psi)
Tensile Modulus (N/mm²) 900 (130,000 psi)
Adhesive Strength (Lap Shear, ISO 4587)
Substrate Bond Gap Strength (N/mm²) Strength (psi)
Steel (grit blasted, Activator 7387™ on 1 side, 24h @ 23°C) 0.05 mm 13.8 2,000
Steel (grit blasted, Activator 7387™ on 1 side, 48h @ 23°C) 0.127 mm 17 2,500
0.25 mm 14 2,000
0.38 mm 11 1,600
Steel (grit blasted, Activator 7387™ on both sides, 48h @ 23°C) 0.127 mm 21 3,000
0.25 mm 18 2,700
0.38 mm 16 2,300
Ferrite Magnet to Mild Steel (Block Shear Strength, 0.05 mm gap) 12 1,700
Peel & Impact Strength
Property Value
180° Peel Strength (Steel, grit blasted, N/mm) 3.3 (19 lb/in)
“T” Peel Strength (Aluminum, grit blasted, N/mm) 1.7 (10 lb/in)
Impact Strength (Ferrite Magnet to Mild Steel, J) 2.3
Environmental Resistance
  • Heat Resistance: Retains strength up to 150°C, gradual reduction beyond
  • Chemical Resistance (after 1000h exposure at 23°C):
    • Motor Oil (87°C): Retains 130% strength
    • Air (40°C): Retains 99% strength
    • ATF (87°C): Retains 138% strength
    • Water/Glycol (50°C, 50/50 mix): Retains 42% strength

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