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LOCTITE® HHD 4042 – Epoxy/Acrylate Adhesive – Device assembly and structural bonding in electronics

  • Item Name: LOCTITE HHD 4042
  • Manufacturer: Henkel
  • Product category: Adhesive/Sealant for device assembly and structural bonding
  • Technologies: Epoxy/Acrylate
  • Applications: Designed for electronic component assembly requiring dual cure bonding.
  • Color: Light yellow paste
  • Cure type: Dual cure (UV light and heat cure)
  • Package size: Contact to Techniq VN for details

1. Product Overview

LOCTITE HHD 4042 is a dual-cure structural adhesive designed for device assembly. It is formulated to cure initially under UV light, with a secondary heat cure to achieve maximum performance. The adhesive has a light yellow paste appearance and is suitable for electronic component assembly.


2. Applications

  • Device assembly
  • Electronic component bonding
  • Structural adhesive applications

3. Typical Properties

Uncured Properties

Property Value
Technology Epoxy/Acrylate
Appearance Light yellow paste
Viscosity (25°C, mPa·s) 125,000 (Spindle 52, 0.5 rpm)
Specific Gravity (@ 25°C) 1.63
Pot Life (@ 25°C, days) 8 (Keep away from light)

Curing Properties

Curing Method Conditions
UV Cure 300 – 500 nm light wavelength
UV Tack-Free Time <6 seconds
Heat Cure 1 hour @ 120°C

Cured Performance

Test Value
Glass Transition Temperature (Tg) 145°C
Coefficient of Thermal Expansion (Alpha 1) 45.38×10⁻⁶ cm/cm/°C
Coefficient of Thermal Expansion (Alpha 2) 138.73×10⁻⁶ cm/cm/°C
Volume Shrinkage on Cure 3.1%

Lap Shear Strength (Cured 1 hour @ 120°C)

Substrate Strength (N/mm²) Strength (psi)
Steel 21 3,045

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