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HomeShop SuppliesAdhesives, Tapes, & SealantsSealantsFuselage Sealants3M™ Aerospace AC-665 Class C Fay Surface Polysulfide Fuselage Sealant3Mô Aerospace AC-665 C-48 Brown MIL-PRF-81733D Cl 1, Gr A, Ty IV-48 Spec Fay Surface Polysulfide Fuselage Sealant - Pint Kit
3Mô Aerospace AC-665 C-48 Brown MIL-PRF-81733D Cl 1, Gr A, Ty IV-48 Spec Fay Surface Polysulfide Fuselage Sealant - Pint Kit
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3Mô Aerospace AC-665 C-48 Brown MIL-PRF-81733D Cl 1, Gr A, Ty IV-48 Spec Fay Surface Polysulfide Fuselage Sealant - Pint Kit

Part#: 051141-58178
Our Price: $74.85
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Country of Origin: USA
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Material Safety Information
Code: UN1866 | Class: 3 | Group: III - Details
Material Safety Data Sheet: MSDS1
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3Mô Aerospace Sealant AC-665 Class B are two-part, manganese-cured, chromate containing, corrosion inhibiting sealants. These sealants provide an effective barrier against the common causes of corrosion on aluminum and between dissimilar metals. 3M AC-665 Class B Sealants have outstanding resistance to aviation gasoline and jet fuel, as well as resistance to chemicals, hydraulic fluids and petroleum products common to the aircraft industry. The mixed compound is a thixotropic paste, easily applied by spatula, extrusion gun or injection gun. They maintain flexibility and bond strength on most metal substrates under extremes of temperature, weathering and stress.
Alternate PN#s: 58178 70005203735
Mixing Instructions

Two Part Sealant: 1. Holding the cartridge, grasp the dasher rod and pull back approximately one inch.

2. Insert the ramrod into the hollow of the dasher rod, break the piston loose, and inject about 1/3 of the contents into the cartridge.

Note: Do not inject all of the catalyst in one location. Distribute evenly throughout base material.

3. Repeat steps 2 and 3 until all the contents of the rod are emptied into the cartridge. Remove the ramrod.

4. Mix for the required number of strokes (hand mixing) or for the required amount of time (machine mixing) indicated in the kit intructions.

5. When mixing is complete, remove bottom cap.

6. Pull the dasher rod back to the neck of the cartridge, grasp the cartridge firmly at the neck, unscrew the dasher rod and remove.

7. Screw the nozzle into the cartridge, insert into the extrusion gun and use as required. For hand extrusion, press the used dasher rod against the plunger to force the material from the cartridge.


The shelf life of AC-665 Class C is 9 months from date of packaging, when stored at temperatures below 80 degrees F in its original container.

Mixed AC-665 Class C may be stored under refrigeration as follows: 15 days at -10 degrees F, 30 days at -40 degrees F. It is important to remember that freezing, storing and thawing procedures reduce application life. Also, frozen storage will reduce application life by varying amounts depending on the storage temperature and length of storage time. All aspects of storage, freezing and thawing should be planned carefully and it is not recommended to mix and freeze with less than 1/2 hour application time.

Health and Safety Precautions

AC-665 Class C sealant is safe to use and apply when recommended precautions are followed. Before using this product, read and understand the Material Safety Data Sheet (MSDS), which provides information on health, physical and environmental hazards, handling precautions and first aid recommendations. An MSDS is available upon request. Avoid overexposure. Obtain medical care in case of extreme overexposure.

Product Details
UOM : Kit
Size : Pint
Color Family : Brown
Shipping Weight : 1.4 pounds
Manufacturer P/N : 051141-58178
UPC : 051141581781
EAN : 0051141581781
Schedule B Code : 3214.10.0010
Military Standard : MIL-PRF-81733D All Class 1, Grade A, Type IV-48
Disclaimer: While reasonable efforts have been made to ensure all information on this website is accurate, and Styles Logistics, Inc. do not assume responsibility for any errors or omissions. All specifications, illustrations, data and prices are subject to change without notice.
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