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LOCTITE® ECCOBOND F 123 – Epoxy adhesive for terminating fiber optic connectors, offering thermal shock resistance and low-stress bonding.

  • Item Name: LOCTITE ECCOBOND F 123
  • Manufacturer: Henkel
  • Product Category: Assembly Adhesive for Fiber Optic Applications
  • Technologies: Epoxy system with color-keyed formulation (two-component mix; resin:hardener ratio 100:10)
  • Applications: Terminating single or multi-channel fiber optic connectors, potting glass fibers, and bonding fiber optic bundles; suitable for most metals, ceramics, glass, and plastics
  • Color: Unmixed: Light yellow; Mixed: Green/Blue; Cured: Reddish-amber
  • Cure Type: Heat cure
  • Package Size: Contact Techniq VN for details.
  • Shelf Life: Contact Techniq VN for details.

1. Product Overview

  • Technology: Epoxy
  • Cure Type: Heat cure
  • Color:
    • Unmixed: Light yellow
    • Mixed: Green/Blue
    • Cured: Reddish-amber
  • Key Benefits:
    • Fast cure, low viscosity, good wicking
    • Tough adhesion to fiber optic and optical materials
    • High impact resistance, excellent thermal shock resistance
    • Low-stress connections, color-coded cure status

2. Applications

  • Primary Use: Fiber optic connectors and assemblies
  • Common Applications:
    • Terminating single or multi-channel fiber optic connectors
    • Potting glass fibers, fiber optic bundles
  • Compatible Substrates:
    • Most metals, ceramics, glass, plastics

3. Typical Properties

Property Value
Uncured Properties
Viscosity @ 25°C 4,000 cP
Specific Gravity (mixed) 1.2
Reactive Solids Content 100%
Pot Life 4 hours
Curing Performance
Cure Schedule 5 min @ 100°C
Alternative Cure 2 min @ 120°C / 1 min @ 150°C
Post Cure (if >150°C) 30 min @ 150°C
Large Mass Gel Phase 4 hrs @ 25°C → 5 hrs @ 100°C
Cured Properties
Glass Transition Temperature (Tg) 120°C
Coefficient of Thermal Expansion 6.31 × 10¹ ppm/°C (Below Tg) / 2.03 × 10² ppm/°C (Above Tg)
Hardness (Shore D) 87
Refractive Index 1.56
Water Absorption 0.004%
Spectral Transmittance (6000-9000 Å) 93%
Mechanical & Electrical Properties
Lap Shear Strength (Al-Al) 2,900 psi
Dielectric Strength 400 V/mil

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