ECCOBOND F123

Harmonization Code : 5906100000 | Adhesive tape of a width not exceeding 20cm

ECCOBOND F123

Main features

  • Fast Application Cure
  • Good Capillary Application
  • Thermal Shock Resistance

Product Description

LOCTITE ECCOBOND F 123 is a two-part, heat-cure epoxy adhesive formulated for terminating single- and multi-channel fiber optic connectors and potting glass fibers and fiber optic bundles. The mixed material has a typical viscosity of 4,000 cP at 25°C and a four-hour pot life, supporting controlled wicking into optical assemblies. It uses a 100:10 resin-to-hardener mix ratio by weight and offers cure schedules as fast as one minute at 150°C. The cured adhesive operates from -60 to 175°C and combines mechanical-impact resistance, thermal-shock resistance, and low-stress bonding with no pistoning. Its color-keyed formulation changes from green/blue when mixed to reddish-amber after cure, providing a visible indication of cure status.

Key features

  • Fast heat cure: Cure options include five minutes at 100°C, two minutes at 120°C, or one minute at 150°C.
  • Low-viscosity wicking: Typical mixed viscosity of 4,000 cP at 25°C supports application within fiber optic assemblies.
  • Low-stress optical bonds: Resists mechanical impact and thermal shock while supporting connections without pistoning.

Applications / Suitable for

  • Single- and multi-channel fiber optic connector termination
  • Fiber optic bundle assembly
  • Potting glass fibers
Product Family

ECCOBOND F123

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TDS, SDS & Technical Documents

Technical Specifications

Physical Properties
Thixotropic index
Thixotropic Index is a ratio of a material s viscosity at two different speeds in Ambient temperature, generally different by a factor of ten. A thixotropic material s viscosity will decrease as agitation or pressure is increased. It indicates the capability of a material to hold its shape. Mayonnaise is a great example of this. It holds its shape very well, but when a shear stress is applied, the material easily spreads. It helps in choosing a material in accordance to the application, dispense method and viscosity of a material.
1.0
Viscosity
Viscosity is a measurement of a fluid’s resistance to flow. Viscosity is commonly measured in centiPoise (cP). One cP is defined as the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP. A product like honey would have a much higher viscosity -around 10,000 cPs- compared to water. As a result, honey would flow much slower out of a tipped glass than water would. The viscosity of a material can be decreased with an increase in temperature in order to better suit an application
4000 mPa.s
General Properties
Mix Ratio
The amount of a constituent divided by the total amount of all other constituents in a mixture
100:10
Refractive index
The refractive index determines how much the path of light is bent, or refracted, when entering a material. It is calculated by taking into account the velocity of light in vacuum compared to the velocity of light in the material. The refractive index calculation can be affected by the wavelength of light and the temperature of the material. Even though it is usually reported on standard wavelengths it is advised to check the TDS for the precise test parameters.
1.56
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
1.2
Thermal Properties
Glass Transition Temperature (Tg)
The glass transition temperature for organic adhesives is a temperature region where the polymers change from glassy and brittle to soft and rubbery. Increasing the temperature further continues the softening process as the viscosity drops too. Temperatures between the glass transition temperature and below the decomposition point of the adhesive are the best region for bonding. The glass-transition temperature Tg of a material characterizes the range of temperatures over which this glass transition occurs.
120 °C

Additional Information

Technical properties

As-supplied / before-processing properties

Typical values unless stated otherwise. Mixed properties apply after combining resin and hardener at a 100:10 ratio by weight.

Property Value Unit Method / condition
Appearance Light yellow — Unmixed material
Appearance Green/blue — Completely mixed material
Mix ratio 100:10 Ratio Resin to hardener, by weight
Mixed viscosity 4,000 cP At 25°C
Specific gravity 1.2 — Mixed material
Pot life 4 hours Mixed material
Reactive solids content 100 % Typical uncured material property
Technical properties

After-processing / final-state properties

Typical cured-material and bonded-joint reference values. Results are not guaranteed production specifications or universal joint-design values.

Property Value Unit Method / condition
Operating temperature -60 to 175 °C Documented product operating range
Glass transition temperature 120 °C Typical cured material
Hardness 87 Shore D Typical cured material
Refractive index 1.56 — Typical cured material
Water absorption 0.004 % Typical cured material
Spectral transmittance 93 % Wavelength range of 6,000–9,000 Å
Dielectric strength 400 V/mil Typical cured material
Lap shear strength 2,900 psi Aluminum-to-aluminum test specimen

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