Opti-tec 5053-F-B High Temperature Fast Cure Epoxy Adhesive for Fibre Optic Terminating

OPT 5053-F-B

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About Opti-tec 5053-F-B High Temperature Fast Cure Epoxy Adhesive for Fibre Optic Terminating

Also available to buy online at  Available at Intertronics.shop

Opti-tec 5053-F-B is a two-component, low viscosity, heat curing epoxy designed for high-temperature applications. It is especially well suited to fibre optic terminating, where optical fibres are “pot and polished” into connectors or ferrules.

Opti-tec 5053-F-B is an improved and fast cure version of Opti-tec 5053.


Fibre Optic Termination

Features & Benefits

  • High surface energy and low viscosity allows it to readily wet and wick between optical fibres. It develops strong adhesion to most materials used in fibre optics and optics, including metals, ceramics, glass and most plastics.
  • High glass transition temperature results in excellent high temperature performance and creep resistance
  • Resists moisture, vapours and most chemicals. It features low outgassing and low vapour pressure, making it an ideal sealing material for electronic and optical applications.
  • Colour change upon cure, going from clear to deep translucent red.
  • Specially formulated to have very low skin sensitivity
  • Long pot life and good handling characteristics
  • Used for Telcordia GR-326-CORE compliant assemblies (General Requirements for Singlemode Optical Connectors and Jumper Assemblies – formerly Bellcore), where its high Tg and environmental robustness allow the termination to meet the specification. Note: optimal cure schedule required.


  • Fibre optic terminatingOPT5053-F-A 900g bulk packaging
  • Endoscope manufacture and repair
  • Optoelectronics
  • High temperature, high performance bonding
  • Electronic sealing


Part number change: as of version 5.0, April 2021, the part number of this product changed from Opti-tec 5053-F-A to Opti-tec 5053-F-B. This is due to an unavoidable change in a formulation component. This change does not affect the product data-sheet specifications. The new formulation has passed internal testing and is deemed to be equivalent.


Mix ratio 8:1 resin to hardener
Mix viscosity 500-2,000 cps
Surface tension 42-44 mN/m
Pot life 4 hours @ 23°C
(4g mixed)
Cure schedule Bondline temperature
15 mins
5 mins
2 mins
Note: Optimal cured properties are achieved by curing for 5 minutes at a bondline temperature of 120°C. Whilst lower cure temperatures are quoted, they are not recommended for best performance.
Optimum cured properties
(5 minutes @ 120°C)
Refractive index 1.55
Glass transition temperature (Tg) >100°C
Specific gravity 1.15
Hardness, Shore D 85
Temperature range -60 to 200°C
Modulus of elasticity 1 GPa
CTE 55 ppm/°C
Average between 0°C and 100°C
Adhesive properties
Lap shear (Al/Al) 11 MPa (@ 23°C)
Shelf life 12 months from date of manufacture in original sealed containers


Safety Data Sheets
For the latest SDS for this product, please e-mail msds@intertronics.co.uk

Other Information

See how the Opti-tec 5053-F-B works as part of a real application in this adhesive Case Study:

Fiber optic lighting potting

Unitising of common end fibre optic lighting harnesses using Opti-tec 5053-F-B.


Our Technical Bulletins page has links to:

All Downloads

Filename Size Download
OPT 5053-F-B Product Data Sheet 0.08MB Download
Operator Sensitisation from Fibre Optic Epoxies 0.13MB Download
Twinpack Mixing Instructions 0.17MB Download
Bulk Mixing Materials Instructions 0.21MB Download
How Much Adhesive Will I Need? 0.15MB Download

Ordering Information

OPT 5053-F-B is available in twinpacks or in bulk.

Twinpack packaging Twinpack packaging instructions

The twinpack is a clear film sachet, with the resin and hardener separated by a removable clip and rail divider. Click here for instructions on how to mix twinpacks.

Standard twinpack size is 4g total weight. OPT 5053-F-B twinpack sachets are packaged in quantities of 5, sealed into a protective aluminium foil pouch.

Part number Description
Click here to buy on intertronics.shop
5 x 4g twinpack sachets
Click here to buy on intertronics.shop
450g kit
Click here to buy on intertronics.shop
900g kit

For optimal results, store away from acids, amines, strong alkalis and oxidising material. Static electricity and formation of sparks must be prevented. Keep only in the original container. Keep container tightly closed and upright, in a cool, well-ventilated place. Protect containers from damage. Bund storage facilities to prevent soil and water pollution in the event of spillage. The storage area floor should be leak-tight, jointless and not absorbent.


Let’s start by talking about your application

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  • Last updated: January 2024
  • Version: 5.4

Statements, technical information and recommendations contained herein are based on tests we believe to be reliable but they are not to be construed in any manner as warrantees expressed or implied. The user shall determine the suitability of the product for his intended use and the user assumes all risk and liability whatsoever in connection therewith.