3M™ Aerospace Sealant AC-380

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Helps reduce shrinkage and rework for total cost reduction

Excellent tooling properties for easy application

Quick cure allows increased throughput

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Frequently viewed resources
Tech Data Sheet (PDF, 75KB)Safety Data Sheet (PDF, 0B)
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  • Helps reduce shrinkage and rework for total cost reduction
  • Excellent tooling properties for easy application
  • Quick cure allows increased throughput
  • Low density formula weighs 3–4 lbs. less per gallon than traditional sealants

Our 3M™ Aerospace Sealant AC-380 is a family of Class B polysulfide sealants formulated for easy tooling. Their quick cure and low density contribute to faster process times and less weight. These two-component, manganese dioxide cure sealants have outstanding resistance to aviation gasoline, jet fuel and chemical products common to the aerospace industry.


Front view of business jet
AC-380 is 33% lighter than conventional fuel tank sealants
3M™ Aerospace Sealant AC-380 offers a number of advantages and benefits compared to traditional sealants. We designed this family of sealants to save time through its fast cure and save weight through its low density formula. Our manganese dioxide cure product is also highly resistant to aviation fuel and many chemicals common to the aircraft industry, making it ideal for fuel tank and fuselage sealing applications.

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Smart Sealants, Robust Results
When you use 3M Sealants, you're applying science, ingenuity, aerospace expertise and cost saving solutions. They have outstanding resistance to aviation gasoline and jet fuel, as well as resistance to chemicals and petroleum products common to the aircraft industry. 3M™ Aerospace Sealant AC-380 is carefully formulated for customers in the aerospace industry. Always read the SDS and Tech Data Sheet along with your internal governing documents prior to use.
Product Class Application Life* Typical Tack Free Time* Typical Cure Time*
(30 Shore A Hardness)
Specific Gravity Applications
3M Aerospace Sealent AC-380 B-1/2 1/2 hour 5 Hours 5 Hours 1.10 Fuel Tank & Fuselage
B-2 2 hours 8-10 hours 8-10 hours
*Measured at Standard Conditions (77°F / 25°C and 50% Relative humidity )

Our Best for Your Best
3M is proud to partner with organizations across the spectrum of aerospace and related industries. Creating efficiencies, reducing process times and lowering aircraft weight is how we execute our never-ending mission to offer best-in-class adhesives, sealants and other products that effectively reduce costs on multiple fronts. Professionals across the industry know the numerous advantages of 3M Aerospace. Our brand is widely recognized for the highest standards of quality and performance, adding value to the final results. By engineering reliability, longevity and performance into all of our products, we have a history of saving money by reducing waste, rework and time.


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3M maintaints partnerships with every major aircraft OEM in the world. Find your spec today.


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