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Thermal Management

LOCTITE® EA 3421 – Epoxy Adhesive – General Bonding

  • Item Name: LOCTITE® EA 3421
  • Manufacturer: Henkel
  • Technologies: Epoxy
  • Color: Resin – White to off-white, Hardener – Amber, Mixture – Clear amber-yellow
  • Cure Type: Room temperature cure after mixing
  • Package Size: Contact to Techniq VN for details.
  • Shelf Life: Contact to Techniq VN for details.

1. Product Overview

  • Technology: Epoxy
  • Type: Two-component (Resin & Hardener)
  • Appearance:
    • Resin: White to off-white paste
    • Hardener: Amber, clear liquid
    • Mixture: Clear amber-yellow
  • Viscosity: Medium
  • Mix Ratio:
    • By volume: 1:1
    • By weight: 100:90
  • Cure Type: Room temperature cure after mixing
  • Key Benefits:
    • High strength and excellent moisture resistance
    • Suitable for bonding metal, ceramic, wood, glass, and rigid plastics
    • Long working life and flowable for large surfaces

2. Applications

  • General-purpose bonding adhesive
  • Ideal for structural bonding where extended working life is needed
  • Suitable for various substrates including metals, plastics, and wood

3. Typical Properties

Before Mixing
Property Resin Hardener
Specific Gravity @ 25°C 1.12 – 1.18 0.94 – 1.1
Viscosity (Brookfield, RVT, 25°C) 30,000 – 90,000 cP (2.5 rpm) / 60,000 – 100,000 cP (5 rpm) 9,000 – 19,000 cP (5 rpm) / 11,000 – 19,000 cP (10 rpm)
After Mixing
Property Value
Pot Life (200g mass @ 25°C) 30 – 150 min
Fixture Time (0.1 N/mm² shear strength) @ 22°C 4 hours
Full Cure Time @ 25°C 36 hours
Cured Properties (7 Days @ 22°C)
Property Value
Coefficient of Thermal Expansion (K⁻¹) 45×10⁻⁶ (16.8 – 40°C) / 173×10⁻⁶ (55.4 – 199.4°C)
Thermal Conductivity (W/m-K) 0.28
Shore Hardness (D) 70 – 80
Glass Transition Temperature (°C) 55
Elongation (%) 6
Tensile Strength (N/mm²) 28 (4,000 psi)
Tensile Modulus (N/mm²) 965 (140,000 psi)
Compressive Strength (N/mm²) 69 (10,000 psi)
Electrical Properties
Property Value
Volume Resistivity (Ω·cm) 1×10¹⁵
Surface Resistivity (Ω) 4×10¹⁵
Dielectric Constant / Dissipation Factor 4.3 / 0.04 (1 kHz)
Adhesive Performance (Lap Shear Strength, ISO 4587)
Substrate Strength (N/mm²) Strength (psi)
Steel (grit blasted) 20 – 25 2,900 – 3,600
Stainless Steel 9 – 12 1,300 – 1,740
Zinc Dichromate 7 – 12 1,000 – 1,700
Aluminum (abraded) 8 – 12 1,200 – 1,700
Aluminum (etched) 12 – 16 1,700 – 2,300
Galvanized Steel 9.4 1,400
Brass 8 – 11 1,200 – 1,600
GRP 0.5 – 2 70 – 290
Phenolic 2.5 – 4.5 360 – 650
ABS 0.5 – 1 70 – 150
Hardwood (Mahogany) 6 – 15 870 – 2,200
Softwood (Red Deal) 8 – 10 1,200 – 1,500
Polycarbonate 2.5 – 4 360 – 580
Environmental Resistance (Aging & Chemical Exposure)

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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