AC Tech 350B-1/2 Quick Cure Fuel Tank & Fuselage Sealant - MMS332B1/2

The shelf life of AC-350 Class B is 9 months from date of packaging, when stored at temperatures below 80 degrees F in its original container.

Mixed AC-350 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 1/2 hour application time.

Health and Safety Precautions

AC-350 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. Avoid overexposure. Obtain medical care in case of extreme overexposure.

Typical Physical and Application Properties

Application Life and Cure Time
(At 75 degrees F, 50% Relative Humidity)

B-1/2

B-2

*Application life refers to the length of time that mixed compound remains at a consistency suitable for application with spatula or caulking gun. Application life is always measured at a standard temperature of 77 degrees F with a relative humidity of 50%. In general, for every 20 degree 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 LP-P-690 standard low-density polyethylene film.

***Cure time is defined as the length of time it takes AC-350 Class B sealant to reach 30A hardness. It depends on three factors: remaining application life, temperature and relative humidity. The temperature/humidity factors for application life also apply to curing. To accelerate the curing process, apply heat up to (but no more than) 140 degrees F.

Typical Physical and Performance Properties of Cured Compound after 14 days at 77 degrees F / 50% Relative Humidity