About IRS 2128 Toughened Epoxy Adhesive

IRS 2128 Toughened Epoxy Adhesive is a high performance black resin system. It has excellent adhesion to a wide variety of substrates and good chemical resistance. A two part system with a simple 1:2 mix ratio, it is supplied in a convenient side-by-side double syringe cartridge, complete with static mixing nozzles.

This adhesive is a good candidate to test for applications where there is vibration, impact or thermal shock. Its resiliency allows this adhesive to withstand impact and vibration stresses, absorb energy, and to deal with bonding materials with different CTEs under thermal cycling.

Features & Benefits

  • Excellent adhesion to a variety of metals, plastics, and GRP
  • Toughened
  • Impact resistant
  • Dimensionally stable
  • Long pot life
  • Thixotropic, gap filling
  • Good general chemical resistance
  • RoHS compliant


  • Bonding of metals, composites or plastics


Mix ratio by weight 1.87:1
Mix ratio by volume 2:1
Viscosity Thixotropic
Colour Black
Specific gravity 1.74
Working life 60 minutes @ room temperature
Cure schedule Bondline temperature
Room temperature (20-25°C)
96 hours – full cure
24 hours – full cure
Typical properties
Hardness, Shore D 70-80
Temperature range -55 to +140°C
Thermal conductivity 1.0 W/mK
Tensile strength 45 MPa
Compressive yield strength <10 MPa
Coefficient of linear expansion 40-60 ppm/C
Volume Resistivity 1.3 x 1010 ohm-cm
Electric strength 15 kV/mm
Water absorption (7 days @ 23°C) 0.4%

Lap shear adhesion
Aluminium to Aluminium 14 MPa
Copper to Copper 15 MPa
Stainless Steel 18 MPa
ABS to ABS 3.1 MPa
Nylon 6 to Nylon 6 2.1 MPa
Acrylic to Acrylic 3.2 MPa

Safety Data Sheets
For the latest SDS for this product, please e-mail [email protected]

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 one customer got results from IRS 2128 for a bonding application in this Case Study:

Application Insight – Ultrasonic Probe Bonding

Bonding elements into non-destructive, ultrasonic test equipment for a variety of industries including gas, oil, road and rail transport and aerospace with IRS 2128


Our Technical Bulletins & Articles page has links to:

All Downloads

Filename Size Download
IRS 2128 Product Data Sheet 0.11MB
Double Syringe Cartridge Instructions 0.19MB
How Much Adhesive Will I Need? 0.15MB
Adhesive Problem? Whats the Cure? 0.38MB

Ordering Information

IRS 2128 is available in a convenient 50ml side-by-side double syringe cartridge. Large cartridges and bulk packaging are available.

The IRS2128-50KIT contains a 50ml cartridge of epoxy, a Syringe Gun and three static mixing nozzles. It is ideal for product evaluations or small quantity users.

Part number Description
IRS2128-50ML Toughened Epoxy Adhesive, Double Syringe Cartridge, 50ml
IDM805001 Dispensing Gun
IDM2N10 Static Mixing Nozzle (pkg 10)
IRS2128-50KIT Toughened Epoxy Adhesive Kit – contains 50ml cartridge of epoxy, a Syringe Gun and three static mixing nozzles

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


Let’s start by talking about your application

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  • Last updated: June 2023
  • Version: 1.2

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.