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About IRS 2125 High Performance Flexible Epoxy Adhesive

IRS 2125 Flexible Epoxy Adhesive is a high performance black resin system. Its combination of flexibility and high adhesive strength lends itself to many high technology bonding, sealing and insulating applications. A two part system with a simple 1:1 mix ratio, it is supplied in a convenient side-by-side double syringe cartridge, complete with static mixing nozzles. Common applications include sealing electronic connections and elevated temperature bonding.

“The IRS2125 epoxy adhesive, performed beyond expectations when applied to seal high pressure hydraulic fluid in a plastic fitting which had sheared. The epoxy set extremely well and passed pressure tests such that it was deemed to be suitable as a permanent seal of the hydraulic system. I would recommend this product as it set rapidly to create an excellent seal and performed well, solving issue with leakage of hydraulic fluids.” – Ian Ross, GMX

Features & Benefits

  • Excellent flexibility giving high shear and peel strength
  • Tough bonds withstand vibration and flex
  • Outstanding chemical and fluid resistance, including moisture, diesel and fuel oils, hydraulic fluid
  • Will bond metal, glass, wood, rubber and many plastics, including cable insulations and connector backshells, heat-shrink material
  • Will operate at temperatures of up to 150°C
  • Can seal to IP68, continuous immersion
  • Supplied in 50ml cartridge for easy application
  • Long shelf life – 18 months from date of manufacture


  • Cable harness assemblies, wiring, cable joints & terminations, heat-shrink sealing
  • Electronics
  • Structural bonding
  • Downhole and oil well operations

“It is nice to use because you don’t have to pre-mix it, and it has a convenient cure time. The tiles have been solid as a rock. It’s obviously the best!” – Carrie Reichardt, Artist


Mix ratio 1:1 resin to hardener
Mixed viscosity ~ 100,000 cps
Colour Black
Specific gravity 1.3
Pot life 90 minutes @ 23°C
Cure schedule Bondline temperature Time
23°C 24 hours – handling strength
23°C 7 days – full cure
85°C 2 hours – full cure
Cured properties
(Measurements taken @ 23°C)
Hardness, Shore D 50-65
Temperature range -75 to 150°C
200°C possible depending on substrate
Elastic modulus @25°C – 350MPa
@50°C – 90MPa
@75°C – 30MPa
@100°C – 30MPa
@125°C – 30MPa
Lap shear strength (Al/Al) 20MPa
Peel strength (XPLE/XPLE) 370N/25mm
Peel strength after thermal shock (4hrs @ 215°C) 370N/25mm
Dynamic shear (boot/cable shell size 22) 520N
Solvent resistance (de-icing fluid, petrol, oil, hydraulic fluid) Excellent
Dielectric strength 408 volts/mil
Surface resistivity 5.5 x 1016 ohm/sq @ 500 volts DC
Volume resistivity 1.9 x 1012 ohm.cm @ 500 volts DC
Thermal conductivity 0.4 W/mK

Lap shear results

Material Shear stress at failure (MPa) Mode of failure
Stainless steel 11.4 Adhesion
Aluminium 6082 T6 8.2 Adhesion
Polycarbonate 6.0 Cohesive substrates &/or adhesion
PMMA 3.8 Adhesion
Nylon 6/6 3.5 Adhesion
ABS 2.8 Adhesion
Glass 1.8 Cohesive substrate

Lap shear graph IRS 2125
Lap shear results for IRS 2125


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

Other Information

Technical Guide - Adhesive Problem? What's the Cure? Adhesive Problem? What’s the Cure?

A guide to adhesive bonding, considering structural bonding and the criteria involved for successful assembly.


See how the IRS 2125 works as part of a real application in this adhesive Case Study:

Case Study - IRS2125 Carrie Reichardt Flexible epoxy adhesive gives strength and durability to mosaic art

British artist Carrie Reichardt relies on our structural adhesives to ensure a strong bond in her creative pieces.


Our Technical Bulletins & Articles page has links to:

All Downloads

Filename Size Download
Double Syringe Cartridge Instructions 0.19MB
How Much Adhesive Will I Need? 0.15MB
Flexible epoxy adhesive gives strength and durability to mosaic art 1.34MB
Adhesive Problem? Whats the Cure? 0.36MB

Ordering Information

IRS 2125 is available in a convenient side-by-side double syringe cartridge.

Part number Description
IRS2125-50G Flexible Epoxy Adhesive, 50 gram double syringe cartridge
IDM805001 Dispensing Gun
IDM2N10 Static Mixing Nozzle (pkg 10)
IRS2125-50KIT Flexible Epoxy Adhesive Kit
Contains 50 gram cartridge of epoxy, a Syringe Gun and three static mixing nozzles

The IRS 2125-50KIT contains a 50 gram cartridge of epoxy, a Syringe Gun and three static mixing nozzles. It is ideal for product evaluations or small quantity users.

Storage: Store in the original unopened containers under cool dry conditions between 15° and 25°C.


Next Steps

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

Find out more information on how to purchase.

  • Last updated: July 2021
  • Version: 4.1

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.