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Low density formula weighs 3–4 lbs. less per gallon than traditional sealants
Quick cure allows increased throughput
Helps reduce shrinkage and rework for total cost reduction
Seals joints and gaps in fuselage applications
Maintains flexibility and bond strength under extremes of temperature, weathering and stress
Easier application – requires less mixing time and less tooling to apply
Our 3M™ Aerospace Sealant AC-770 is a family of Class B, manganese dioxide cured polysulfide sealants formulated for easy tooling. Their fast cure time and low density contribute to faster process times and lighter aircraft. These two-component sealants have outstanding resistance to jet fuel, chemicals and petroleum products common throughout the aerospace industry.
Lightweight, Effective Sealing
3M™ Aerospace Sealant AC-770 offers a number of advantages and benefits compared to competitive sealants. Its lighter weight formula, 25% lower density than traditional sealants, saves vital aircraft weight. AC-770 is available with a 1 hour and 2 hour application life and typical cure times of 6 hours and 11 hours, respectively. Its light weight and low density make it ideal for fuselage sealing and void filling applications. Our manganese dioxide cured product is also highly resistant to aviation fuel and many other chemicals common to the aerospace industry.
Typical Tack Free Time*
Typical Cure Time*
(30 Shore A Hardness)
3M™ Aerospace Sealant AC-770
Fuselage & Pressure
*Measured at Standard Condiitons (77°F / 25°C anf 50% Relative Humidity)
A Sealant Triple Play — Flexible, Strong, and Time Saving
3M™ Aerospace Sealant AC-770 Class B is a two-component thixotropic paste and is lighter than traditional sealants, weighing an average of 3—4 lbs. less per gallon. AC-770 maintains flexibility and bond strength on various substrates under extremes of temperature, weathering, and stress. It is easily applied by extrusion, injection gun or spatula, and exhibits superb tooling properties. Our Class B sealant has no added solvents, which minimizes shrinkage to help reduce rework and improve processes.
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-770 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.
Our Best for Your Best
3M is proud to partner with organizations across the spectrum of aerospace and related industries. Enabling efficiencies, reducing process times and lowering aircraft weight is how we execute our never-ending mission to offer best-in-class adhesives, sealants, surface protection products and composite resins 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 value into all of our products, we have a history of saving money by reducing waste, rework and time.
Find what you need in our aerospace specification portal.
3M maintaints partnerships with every major aircraft OEM in the world. Find your spec today.