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About Opti-tec 5053 High Temperature Epoxy Adhesive

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

Opti-tec 5053, when cured, is considered non-cytotoxic and meets the requirements of ISO 10993-5. It is a suitable candidate for applications in the medical device market – for example, endoscopes or sensors.

Product improvements
For most fibre optic terminating applications, an improved and faster cure version of Opti-tec 5053 is recommended – please see Opti-tec 5053-F-A High Temperature Fast Cure Epoxy Adhesive.

Fibre Optic Termination

Features & Benefits

  • Opti-tec 5053 has high surface energy. This and its 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.
  • Opti-tec 5053 has excellent impact and thermal shock resistance.
  • Opti-tec 5053’s high glass transition temperature results in excellent high temperature performance and creep resistance.
  • Opti-tec 5053 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.
  • Opti-tec 5053 has a colour change upon cure, going from clear to deep translucent red.
  • Opti-tec 5053 has been specially formulated to have very low skin sensitivity.
  • Opti-tec 5053 has a long pot life and good handling characteristics.
  • Opti-tec 5053 is 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.
  • Opti-tec 5053, when cured, is considered non-cytotoxic and meets the requirements of the Elution Test, ISO 10993-5. Further ISO 10993 and USP Class VI qualification pending.


  1. Fibre optic terminating
  2. Endoscope manufacture and repair
  3. Optoelectronics
  4. High temperature, high performance bonding
  5. Electronic sealing
  6. Medical device assembly


Typical Properties
Mix ratio 10:1 resin to hardener
Mix viscosity 1-2 Pa.s (1000-2000 cps)
Surface tension 42-44 mN/m
Pot life 4 hours @ 23°C
Cure schedule Bondline temperature
30 mins
15 mins
10 mins
5 mins
1 min
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) >130°C
Density 1.15
Hardness, Shore D 85
Temperature range -60 to 200°C
Modulus 1 GPa
CTE 55 ppm/°C
Average between 0°C and 100°C
Adhesive properties
Lap shear Aluminium
4000 N
4000 N
4000 N

Other Information

Our Technical Bulletins page has links to:

All Downloads

Filename Size Download
Operator Sensitisation from Fibre Optic Epoxies 0.13MB
Bulk Mixing Materials Instructions 0.18MB

Ordering Information

Opti-tec 5053 is available in bulk kits.

Part number Description
OPT5053-550G 550g kit – 1 x 500g resin, 1 x 50g hardener

For best results, store away from strong alkalis, oxidising material, acids, amines and strong oxidising agents. 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 and protect from freezing and direct sunlight. 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.


Next Steps

Find out more information on how to purchase.

Our technical team are on hand to discuss your application requirements, click here to get in touch.

  • Last updated: January 2020
  • Version: 4.2

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.