3M™ Impact Resistant Structural Adhesive (IRSA)

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IMPACT RESISTANT: Delivers higher impact strength compared to traditional bonding adhesives

LASTING CORROSION PROTECTION: Provides corrosion protection with a lifetime warranty

24-HOUR CURE TIME: Its one-day curing process can be accelerated with heat

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Tech Data Sheet (PDF, 67KB)Safety Data Sheet (PDF, 0B)


  • IMPACT RESISTANT: Delivers higher impact strength compared to traditional bonding adhesives
  • LASTING CORROSION PROTECTION: Provides corrosion protection with a lifetime warranty
  • 24-HOUR CURE TIME: Its one-day curing process can be accelerated with heat
  • WELD OR RIVET: Ideal for either welding or riveting bonding within working time
  • VERSATILE METAL BONDING: Adheres to a wide variety of properly-prepared steel and aluminum substrates
  • BONDING YOU CAN SEE: Colored formula dispenses silver before turning purple to indicate proper curing
  • LONG SHELF LIFE: Offers an excellent shelf life whether opened or unopened, helping to reduce unused product replacement costs

3M™ Impact Resistant Structural Adhesive (IRSA) is formulated for true automotive OEM specified structural bonding applications, excellent for collision absorption in steel structures and advanced lightweight aluminum alloys. This two part epoxy adhesive delivers extended worktimes – up to 1 hour – and can be rapidly heat cured. The adhesive changes from silver to purple as the adhesive cures.


A Structural Adhesive for Automotive Substrates
Engineered to withstand much higher impact vs. traditional bonding adhesives, 3M™ Impact Resistant Structural Adhesive (IRSA) is excellent for true OEM-specified automotive structural applications. It adheres to properly prepared automotive substrates including mild steel, high-strength steel and automotive aluminum alloys — vital as OEMs strive to achieve high strength in increasingly lightweight structures. Two-part epoxy adhesive is recommended for all weld-bonded and rivet-bonded joints when specified by an OEM. It provides an extended work time — as long one hour — and cures rapidly with heat (30 minutes at 80°C/175°F). Adhesive applies in a silver color and changes to purple as it cures, indicating when the process has begun.

Impact Resistance and More
3M™ IRSA is designed to absorb collision energy forces and delivers increased torsional rigidity for OEM-specified automotive structures. It allows for spot-welding (form squeeze-type) in an uncured state, typically up to three hours after application. Properly applied adhesive will seal joints completely, and perform when exposed to very hot and cold temperatures. Its corrosion inhibiting formula delivers lifetime corrosion protection. The cured adhesive can also help decrease NVH (PDF, 325.12 Kb) in the vehicle.

3M™ Impact Resistant Structural Adhesive is available in 200 mL cartridges for smaller jobs, and in 450 mL cartridges for use with the 3M™ Dynamic Mixing System.

About the 3M™ Dynamic Mixing System
With the Dynamic Mixing System (DMS), 3M has created a method for mixing adhesives, sealers and fillers that saves time and helps ensure the proper mixing of two-part formulas every time. The system includes pre-loaded DMS cartridges and a series of DMS mixing nozzles, and works with a standard pneumatic applicator. Instead of premeasuring and premixing two-part products, technicians dispense the perfect amount of material, directly to the job, at the touch of a trigger. This eliminates the messy mixing process, reduces material waste and cleanup time, and helps ensure the quality and performance of finished work.

3M™ Impact Resistant Structural Adhesive in 450 mL cartridges is ready to use with a purple 3M™ DMS Mixing Nozzle, PN 55847. 3M recommends dispensing the adhesive with the pneumatic 3M™ Dynamic Mixing Gun, PN 05846.

Better Science for Better Adhesion from 3M
Since 1925 when one of 3M lab assistants invented masking tape, 3M has been applying science to life —developing adhesive products and technologies that help individual businesses and entire industries. 3M™ Impact Resistant Structural Adhesive (IRSA) represents these decades of knowledge. And, with its formulation for long-term strength, torsional rigidity and corrosion protection even when used in lightweight aluminum alloy structures, it is very simply the right product at the right time for automotive collision repair.








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3M industrial and occupational products are intended, labeled, and packaged for sale to trained industrial and occupational customers for workplace use.  Unless specifically stated otherwise on the applicable product packaging or literature, these products are not intended, labeled, or packaged for sale to or use by consumers (e.g., for home, personal, primary or secondary school, recreational/sporting, or other uses not described in the applicable product packaging or literature), and must be selected and used in compliance with applicable health and safety regulations and standards (e.g., U.S. OSHA, ANSI), as well as all product literature, user instructions, warnings, and other limitations, and the user must take any action required under any recall, field action, or other product use notice.  Misuse of 3M industrial and occupational products may result in injury, sickness, death, or property damage.  For help with product selection and use, consult your on-site safety professional, industrial hygienist, or other subject matter expert.