Applications

LOCTITE® ECCOBOND EN UV9701 – Acrylate Encapsulant – Circuit board component encapsulation in electronics industry

  • Item Name: LOCTITE® ECCOBOND EN UV9701

  • Manufacturer: Henkel

  • Technologies: Acrylate

  • Color: Translucent light blue

  • Cure Type: Ultraviolet (UV) / Moisture

  • Package Size: Contact to Techniq VN for details.

  • Shelf Life: 6 months

1. Product Overview

LOCTITE® ECCOBOND EN UV9701 is a translucent light blue, acrylate-based, one-component encapsulant that cures with UV light and moisture. It is designed for local circuit board protection, offering fast cure, low sensitization, and ease of dispensing without stringing. The product provides reliable adhesion even in shadowed areas, while its UV fluorescence enables inspection. It is optimized for PCB encapsulation where a balance of cure depth, adhesion, and moisture resistance is required.


2. Applications

  • Encapsulation of PCB components.

  • Circuit board protection requiring UV/moisture dual-cure.

  • Suitable for areas with limited light exposure due to its shadow cure capability.

3. Typical Properties

Condition Property Value
Still Not Mixed (Uncured) Appearance Translucent light blue
Viscosity @ 25°C, 2 s⁻¹ 16,800 mPa·s
Thixotropic index (2/20 s⁻¹) 5.9
Pot life @ 25°C 3 days
Shelf life @ 5°C 180 days
Curing Performance UV cure 500 mW/cm² @ 365 nm, 15 s
Cure depth ≥ 0.2 inch under optimum conditions
Additional cure Ambient moisture cure
After Mixed (Cured) Hardness, Shore D (UV only) 65
Hardness, Shore D (+1 day moisture cure) 70
Hardness, Shore D (+3 days moisture cure) 75
Hardness, Shore D (+7 days moisture cure) 80
Glass transition temperature (Tg) 55 °C
CTE below Tg 75 ppm/°C
CTE above Tg 175 ppm/°C
Storage modulus @ 25°C 2,480 N/mm² (359,400 psi)

This dual-cure encapsulant ensures robust adhesion and mechanical strength, providing reliable protection for delicate PCB assemblies even in partially shadowed or moisture-prone environments.

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