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LOCTITE HHD 4042 – Dual Cure Adhesive for Device Assembly and Electronic Structural Bonding

Item Name: LOCTITE HHD 4042
Manufacturer: Henkel
Technologies: Epoxy/Acrylate
Color: Light yellow paste
Cure Type: Ultraviolet (UV) light, Heat cure
Package Size: Contact to Techniq VN for details.
Shelf Life: Contact to Techniq VN for details.

1. Product Overview

LOCTITE HHD 4042 is a light yellow paste, dual-cure adhesive based on epoxy/acrylate technology. It is designed for electronic component assembly and structural bonding, curing initially with ultraviolet (UV) light followed by heat to achieve maximum performance. The adhesive provides strong physical properties, including high glass transition temperature and thermal stability. Its dual cure mechanism ensures rapid tack-free handling and full cure reliability.


2. Applications

  • Device assembly

  • Structural adhesive

  • Electronic component bonding requiring precise cure control

Curing recommendations: Initial UV exposure (300–500 nm) for rapid tack-free handling (<6 s), followed by heat cure (1 hour @ 120°C) for complete bonding.

3. Typical Properties

Property Value
Uncured Material
Technology Epoxy/Acrylate
Appearance Light yellow paste
Viscosity @ 25°C, mPa·s 125,000
Specific Gravity @ 25°C 1.63
Pot Life @ 25°C 8 days (away from light)
Flash Point See SDS
Curing Performance
UV Wavelength, nm 300–500
UV Tack-Free Time, s <6
Heat Cure 1 hour @ 120°C
Cured Material
Glass Transition Temperature (Tg), °C 145
Coefficient of Thermal Expansion Alpha 1, cm/cm/°C 45.38×10⁻⁶
Coefficient of Thermal Expansion Alpha 2, cm/cm/°C 138.73×10⁻⁶
Volume Shrinkage on Cure, % 3.1
Lap Shear Strength, Steel N/mm² 21 (3,045 psi)

LOCTITE HHD 4042 provides dual-cure reliability, ensuring fast handling and high final strength. Proper storage in unopened containers at -40°C is recommended to maintain performance.

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