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  • Higher impact strength versus traditional bonding adhesives
  • Recommended by many OEMs
  • Provides corrosion protection with lifetime warranty
  • Room temperature curing (accelerated curing with heat)
  • Can be weld bonded or rivet bonded within working time
  • Adheres to a wide variety of properly prepared steel and aluminum substrates
  • Dispenses silver, color changes to purple to indicate proper mixing and curing process has begun
  • Has excellent shelf life opened or unopened, reducing 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.

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 our lab assistants invented masking tape, 3M has been applying science to life —developing adhesive products and technologies that help individual businesses and entire industries. Our 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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