Applications

LOCTITE® ECCOBOND EN 3842T – Acrylate Encapsulant/Sealant – Connectors and capacitors in electronic device assembly

  • Item Name: LOCTITE® ECCOBOND EN 3842T

  • Manufacturer: Henkel

  • Technologies: Acrylate

  • Color: Pale yellow, transparent liquid

  • Cure Type: Ultraviolet (UV) light followed by heat cure

  • Package Size: Contact to Techniq VN for details.

  • Shelf Life: 180 days @ -20 °C

1. Product Overview

LOCTITE ECCOBOND EN 3842T is a pale yellow, transparent acrylate adhesive formulated as a one-component, halogen-free encapsulant or sealant. It is thixotropic, providing excellent dispense shape control and reducing migration after application. The material cures rapidly under UV light with a secondary thermal cure mechanism, ensuring full performance even in shadowed areas. Designed for connectors and capacitors, it delivers good adhesion, stable electrical properties, and reliable protection in temperature-humidity environments.


2. Applications

  • Encapsulation or sealing of connectors and capacitors.

  • Electronic component assembly requiring stable electrical performance under humidity bias.

  • Situations needing UV cure with secondary thermal cure for shadowed regions.

  • Precision dispensing applications where shape control is important.

3. Typical Properties

Property Condition / Substrate Value
Uncured Material
Viscosity Brookfield CP 51/5, 25 °C 7,275 mPa·s
Thixotropic Index 0.5/5 rpm 4.0
Specific Gravity 25 °C 1.08
Pot Life 25 °C 2 days
Shelf Life –20 °C (estimated) 180 days
Curing Performance
UV Cure Mercury lamp, 365 nm 2,000 mJ/cm²
Heat Cure 10 min @ 130 °C
Cured Material
Hardness Shore D 26
Glass Transition Temperature (Tg) TMA 20 °C
CTE Below Tg 101 ppm/°C
CTE Above Tg 212 ppm/°C
Storage Modulus DMA, tensile @ 25 °C 577 N/mm²
Moisture Absorption 288 h @ 65 °C/90% RH 1.19 %

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