3M AC-380

Harmonization Code : 3506.91.90.99 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg ; Adhesives based on polymers of headings 3901 to 3913 or on rubber; Other ; Other

3M AC-380

Main features

  • Fuel Tank Sealing Performance
  • Thixotropic Application Control
  • Selectable Assembly Work Life

Product Description

3M Aerospace Sealant AC-380 Class B is a two-part, manganese-dioxide-cured polysulfide sealant for aircraft fuel tank and fuselage sealing. The thixotropic Class B paste can be extruded, injected, or applied by spatula, helping it stay in place during assembly. B-1/2 and B-2 grades provide different application-life and cure schedules while sharing a 100:10 base-to-accelerator mix ratio by weight. After cure, the dark-gray sealant combines low density, flexible Shore A hardness, and service capability across a broad aerospace temperature range.

Key features

  • Fuel Tank Sealing: The polysulfide chemistry supports compatible aircraft fuel tank and fuselage joints.
  • Thixotropic Class B Paste: The mixed sealant supports extrusion, injection, and spatula application.
  • Selectable Work Life Grades: B-1/2 and B-2 schedules support different assembly windows.

Applications

Aircraft fuel tank and fuselage sealing by extrusion, injection, or spatula application.

Product Family

3M AC-380

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Component System
Describes the number of components that must be supplied, mixed, or activated before application or cure.
Two (Base / Accelerator)
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
1.1
Thermal Properties
Service temperature
-62 to 121 °C
Other Properties
Storage Temperature
Below 27 °C

Additional Information

Technical properties

As-supplied / before-processing properties

PropertyValueUnitMethod / condition
Base colorOff white-Before mixing
Accelerator colorBlack-Before mixing
Mix ratio by weight100:10base:acceleratorClass B system
Nonvolatile content97%Typical
Base viscosity10000 to 14000poiseBrookfield RVT, spindle 7, 2 rpm, 77 deg F
B-1/2 schedule0.5; 5; 5hApplication life; tack-free time; cure time at 77 deg F and 50% relative humidity
B-2 schedule2; 8 to 10; 8 to 10hApplication life; tack-free time; cure time at 77 deg F and 50% relative humidity
Technical properties

After-processing / final-state properties

PropertyValueUnitMethod / condition
ColorDark gray-Cured 14 days at 77 deg F and 50% relative humidity
Specific gravity1.1-Cured
Hardness45 to 50Shore ACured
Low-temperature flexibilityNo checking or adhesion loss-At -62 deg C
Service temperature range-62 to 121deg CCured sealant
Short-duration temperature range-62 to 182deg CCured sealant

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