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About IRS 3103 Structural Polyurethane Adhesive

Also available to buy online at  Available at Intertronics.shop

IRS 3103 Structural Polyurethane Adhesive is a general-purpose two-part black adhesive which offers excellent bond strength to a wide range of substrates including plastics, metals and composite materials. It is non-sagging when dispensed, allowing application on vertical substrates, and offers excellent gap-filling properties.

IRS 3103 cures to handling strength in minutes, and reaches enough cure to be sanded after 30 minutes. Once cured, it forms a durable polymer which is resistant to moisture, fuel, solvents and chemicals.

IRS 3103 is supplied in pre-measured, side-by-side double syringe cartridges and includes static mixing nozzles for straightforward application.

Features & Benefits

IRS3103-B-50 polyurethane bead dispense

  • Great adhesion
  • Easy to use 1:1 mix ratio
  • Packaged in convenient side-by-side cartridges
  • Excellent resistance to moisture, fuel, many chemicals and solvents
  • May be readily sanded and painted
  • 18 month shelf life in original sealed cartridge
  • Solvent free


  • Bonding of plastics, metal, GRP, ceramics, SMC, wood, plasterboard, concrete, rock and marble
  • Interior and exterior automotive aftermarket applications
  • Outdoor lighting and signage
  • Projects where fast cure is required


Specification IRS 3103-B
Colour Black
Mix ratio 1:1
Mixed viscosity 55,000 mPas
Shelf life 18 months
Cure schedule
Working life 3.5 minutes
Handling strength 10 minutes
Able to be sanded 30 minutes
Cured properties
Measurements taken at 23°C
Hardness, Shore D 63
Tensile strength 23 MPa
Young’s modulus 245 MPa
Elongation at break 55%
Operating temperature range -20°C to 90°C
Glass transition temperature 65°C


Lap Shear Adhesion
Steel to Steel 15 MPa
SMC to SMC 5 MPa
PVC to PVC 3.3 MPa
PP to PP 1.3 MPa
E-coat to E-coat 9.6 MPa


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


As of 24 August 2023, adequate training is required before industrial or professional use of this product.

Other Information

Front cover of Structural Adhesives selector guide showing adhesive being dispensed with a handheld dispensing gun Structural Adhesives Selector Guide

Start your adhesive selection process by reading our Structural Adhesives Selector Guide, detailing different chemistries and material specifications.

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.


Our Technical Bulletins & Articles page has links to:

All Downloads

Filename Size Download
Adhesive Problem? Whats the Cure? 0.38MB Download
Double Syringe Cartridge Instructions 0.19MB Download
How Much Adhesive Will I Need? 0.15MB Download
Structural Adhesives Selector Guide 1.12MB Download

Ordering Information

Part number Description
Click here to buy on intertronics.shop
IRS 3103 Structural Polyurethane Adhesive, black, 50 gram
· 2 x IDM2N18 Static mixing nozzles
Click here to buy on intertronics.shop
IRS 3103 Structural Polyurethane Adhesive Kit includes:
· 1 x IRS3103-B-50 Double syringe cartridge
· 1 x IDM805001 Syringe gun
· 2 x IDM2N18 Static mixing nozzles
IDM805001 Dispensing Gun
IDM2N18 Static mixer nozzle, orange (pkg 10)


Let’s start by talking about your application

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  • Last updated: January 2024
  • Version: 1.4

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.