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LOCTITE® EA 3425 (Hysol® 3425) – High viscosity epoxy adhesive for bonding metals, ceramics, plastics, and wood

  • Item Name: LOCTITE® EA 3425 (Hysol 3425)
  • Manufacturer: Henkel
  • Product Category: Epoxy Adhesive
  • Technologies: Two-part, thixotropic epoxy adhesive
  • Applications: Bonding metals, ceramics, rigid plastics, and wood
  • Color: Yellow/white (mixed), Light beige (resin & hardener)
  • Cure Type: Room temperature cure after mixing
  • Package Size: Contact Techniq VN for details
  • Shelf Life: Contact Techniq VN for details

1. Product Overview

LOCTITE® EA 3425 is a two-component, thixotropic epoxy adhesive that cures at room temperature. It is designed for bonding metals, ceramics, rigid plastics, and wood. This adhesive provides high strength and non-sag properties, making it ideal for vertical surfaces and filling gaps up to 3 mm.

2. Applications

  • General-purpose bonding
  • Structural bonding of metals, ceramics, rigid plastics, and wood
  • Suitable for rough and vertical surfaces

3. Typical Properties

Uncured Material

Property Resin Hardener
Appearance Light beige paste Light beige paste
Specific Gravity (@25°C) 1.34 – 1.4 1.37 – 1.45
Viscosity (Brookfield RVT, 25°C, mPa·s) 1,500,000 – 3,500,000 100,000 – 300,000
Mix Ratio (by weight) 100:100
Pot Life (@25°C, 200g mass) 55 – 105 minutes

Cured Properties (After 7 days at 22°C)

Property Value
Shore Hardness (Durometer D) 70 – 80
Glass Transition Temperature (Tg) 63°C
Elongation 3%
Tensile Strength 27 N/mm² (3,900 psi)
Tensile Modulus 1,350 N/mm² (200,000 psi)
Compressive Strength 65 N/mm² (9,400 psi)
Coefficient of Thermal Conductivity 0.28 W/(m-K)

Adhesive Performance (Lap Shear Strength @22°C)

Substrate Strength (N/mm²)
Steel (grit blasted) 25 – 30
Stainless Steel 10 – 12.5
Aluminum (abraded) 7 – 13
Aluminum (etched) 18 – 22
Galvanized Steel 11 – 16
Zinc Dichromate 12 – 15
Brass 9 – 15
Hardwood (Mahogany) 8 – 14
Softwood (Red Deal) 8 – 10

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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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