Applications

LOCTITE® ECCOBOND EN 3770 – Acrylate Encapsulant – Electronic & Circuit Board Encapsulation in CSP, BGA assemblies

  • Item Name: LOCTITE® ECCOBOND EN 3770

  • Manufacturer: Henkel

  • Technologies: Acrylate

  • Color: Blue liquid

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

  • Package Size: Contact to Techniq VN for details.

  • Shelf Life: 6 months

1. Product Overview

LOCTITE® ECCOBOND EN 3770 is an acrylate-based, blue liquid adhesive engineered as a one-component encapsulant for PCB applications. It offers UV/heat dual curing, thixotropic behavior, low glass transition temperature, and reworkability. Once cured, it ensures reliable mechanical protection, flexibility, and durability under environmental stress such as temperature, humidity, and bias conditions.


2. Applications

  • Encapsulation of electronic components on printed circuit boards.

  • Protection of CSP (Chip Scale Packages) and BGA (Ball Grid Arrays).

  • Ensures both physical stability and electronic performance under demanding conditions.

3. Typical Properties

Condition Property Value
Still Not Mixed (Uncured) Viscosity @ 25°C, 5 rpm 8,000 mPa·s
Thixotropic index (0.5/5 rpm) 4.1
Work life @ 25°C 2 days
Shelf life @ -20°C 180 days
Curing Performance UV wavelength 365 nm
Light intensity 100 mW/cm²
UV exposure time 20 s
Secondary heat cure >10 min @ 130°C
After Mixed (Cured) Hardness (Shore D) 29
CTE below Tg 99 ppm/°C
CTE above Tg 215 ppm/°C
Glass transition temperature (Tg) 23 °C
Storage modulus @ 25°C 489 N/mm²

This adhesive combines low modulus with flexibility, making it ideal for reworkable electronic encapsulation where both mechanical strength and stress relief are required.

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