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LOCTITE® AA 331 – Toughened acrylic adhesive for bonding metals, magnets, and pre-coated sheet metal assemblies

  • 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

BERGQUIST microTIM mTIM 1028 Thermal Interface Coating High performance thermal management solution for nickel finished heat sinks, optical transceivers, and data center liquid cooling systems

BERGQUIST microTIM mTIM 1028 is purpose built for riding cage assemblies in servers, switches, and routers, interfacing with electroless nickel plated copper or aluminum heat sinks. It ensures stable operation in high power transceiver modules while also extending applicability to liquid cooling components, heat pipes, and fin based dissipative structures.

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