3M™ Aerospace Sealant AC-370

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Helps reduce shrinkage and rework for total cost reduction

Excellent tooling properties, applies easily and cures quickly

Maintains flexibility and bond strength in a wide variety of temperatures and stress conditions

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Tech Data Sheet (PDF, 93KB)Safety Data Sheet (PDF, 0B)

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Typical properties

Details

Highlights

Helps reduce shrinkage and rework for total cost reduction
Excellent tooling properties, applies easily and cures quickly
Maintains flexibility and bond strength in a wide variety of temperatures and stress conditions
Low density reduces final aircraft weight
Quick cure allows increased throughput

Our 3M™ Aerospace Sealant AC-370 is a family of Class B, quick-curing polysulfide fuel tank sealants formulated for easy tooling. Their quick cure and low density contribute to faster process times and lower weight. These two-component, manganese dioxide cure sealants have outstanding resistance to aviation fuel and petroleum products common to the aerospace industry.

3M™ Aerospace Sealant AC-370 is a two-component thixotropic paste that is lighter in weight and lower in density than competitive sealants, which saves final aircraft weight. AC-370 is available in a 1/2 hour or 2 hour application life with typical cure times of 7 hours and 10 hours respectively. Its light weight and low density formulation makes it ideal for fuselage and fuel tank sealing applications. We designed this family of sealants to save time through fast cure, and to save weight through its low density formula. Our manganese dioxide cure sealant is also highly resistant to aviation fuel and chemicals common to the aircraft industry.

A Sealant Triple Play — Flexible, Strong, and Time Saving
Applied by injection gun or spatula, 3M™ Aerospace Sealant AC-370 offers superb tooling properties for professional results. The mixed compound forms a thixotropic paste that maintains its flexibility and bond strength on many metal, composite and coated substrates under extremes of temperature, weathering and stress. We add no additional solvents to our formula, which gives you more useable sealant by purchase volume, compared with some competitive sealants. 3M Aerospace Sealant AC-370 can help you save production time from the start because there is little to no shrinkage due to solvent evaporation. We make AC-370 to be less stiff than competitive sealants, so it is easier to mix, apply and tool. All these attributes add up to higher productivity in less time.

Aerospace Sealants Product Comparison

		At Standard Conditions		At Standard Conditions		At Standard Conditions		Density
Specification	Product	Tack Free	Cure	Tack Free	Cure	Tack Free	Cure	Standard Density	Medium Density	Low Density
AMS3281
Light Weight Fuel and Fuselage
3M Aerospace Sealant (TYPE 1)	AC-370			6-7 Hours	6-7 Hours	7-8 Hours	8-10 Hours		X
3M Aerospace Sealant (TYPE 2)	AC-380			5 Hours	5 Hours	8-10 Hours	8-10 Hours			X

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 fuel and petroleum products common to the aircraft industry. 3M™ Aerospace Sealant AC-370 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.