3M Aerospace AC-236 Class B-1/2 Fuel Tank & Fuselage Sealant
Seal integral fuel tanks, repair integral fuel tanks and seal fuselages with the use of 3M Aerospace AC-236 Class B-1/2 fuel tank and fuselage sealant from SkyGeek. This sealant’s formula consists of a two-part manganese dioxide-cured, liquid polysulfide polymer compound. This thixotropic paste can be easily applied through the use of an injection gun, extrusion gun or spatula. Use it on aluminum, stainless steel or steel surfaces. This product remains flexible with a strong bond when used with most metal substrates. Once cured, AC-236 resists chemicals, petroleum products, jet fuel and aviation gasoline.
Approvals, References and Specifications
Use InstructionsTwo-Part Sealant Cartridges:
The shelf life of AC-236 Class B is 9 months from date of packaging, when stored at temperatures below 80 degrees F in its original container.
Mixed AC-236 Class B 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 half an hour application time.
Health and Safety Precautions
AC-236 Class B 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 on request. Avoid overexposure. Obtain medical care in case of extreme overexposure.
SpecificationsAMS-S-8802 - Qualified
FMS 1049 - Qualified
299-947-074 - Qualified
LES 1039 BU - Qualified
HS 12373 Rev A - Qualified
BS 25146 - Qualified
WL 5.5902 - Meets requirements
DTD 900/6147 - Meets requirements
STRYP 5960 - Meets requirements
Typical Physical and Application Properties
Application Life and Cure Time
*Application Life refers to the length of time that mixed compound remains at a consistency suitable for application with roller or brush. Application life is always measured at a standard temperature of 75 degrees F with a relative humidity level of 50%. In general, for every 20 degrees F rise in temperature, the application life is halved; and for every 20 degree drop, it is doubled. High humidity levels during the mixing process will shorten application life.
**Tack-free Time is the length of time after which a mixed sealant will no longer tightly adhere to L-LP-690 standard low density polyethylene film.
***Cure time is defined as the length of time it takes AC-236 Class B sealant to reach 30A hardness. It depends on three factors: remaining application life, temperature and relative humidity. To a certain extent, the temperature/humidity factors for application life also apply to curing. To accelerate the curing process, apply heat up to (but not more than) 120 degrees F.
Typical Physical and Performance Properties of Cured Compound After 14 Days at 77 degrees F / 50% Relative Humidity (when tested per AMS-S-8802)