3M Aerospace AC-665 Class B-2 Corrosion Inhibitive Sealant
Donít leave your aircraft exposed. Protect it from the major causes of corrosion with the use of 3M Aerospace AC-665 Class B-2 corrosion inhibitive sealant from SkyGeek. This anti-corrosion sealant provides excellent protection against aviation gasoline, jet fuel, chemicals, hydraulic fluids and petroleum products. All of these substances can be causes of corrosion that are common to the aerospace industry. Mix the two parts of this manganese-cured, chromated sealant to create a thixotropic paste. Apply it to a surface using a spatula, injection gun or extrusion gun.
Approvals, References and Specifications
- BAMS 552-007
- CML 09-044
- GAMPS 7115
- STM 40-111
- 299-947-074 B-2 (PMF)
- Two-part manganese-cured, chromated, corrosion inhibitive sealant
- Effective barrier against common causes of corrosion on aluminum and between dissimilar metals
- Resistant to aviation gasoline, jet fuel, chemicals, hydraulic fluids and petroleum products found in the aircraft industry
- Thixotropic paste easily applied by spatula, extrusion gun or injection gun
- Maintains flexibility and bond strength on most metal substrates
- Withstands extreme temperatures, weathering and stress
- Color: Black
- Specific gravity: 1.60
- Hardness: 52 Shore A
- Service temperatures: -65 degrees Fahrenheit to 250 degrees Fahrenheit
- Tensile strength: 250 psi
- Elongation: 425 percent
- Soluble chromate content: 4 to 5 percent
- Repairability: 35-piw/100 percent cohesion to itself and other STM 40-111 and MIL-PRF-81733 qualified sealants
- Non-nutrient fungus resistance
Use InstructionsMixing 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 B is at least 9 months from date of packaging, when stored at temperatures below 80 degrees F in its original
Mixed AC-665 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-665 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 upon request. Avoid overexposure. Obtain medical care in case of extreme overexposure.
BAMS 552-007 - Qualified B-1/2, B-2
CML 09-044 - Qualified B-1/2, B-2
GAMPS 7115 - Qualified B-1/2, B-2
MB1658 - Qualified B-1/2, B-2
MIL-PRF-81733 - Qualified B-1/2, B-2
STM 40-111 - Qualified
299-947-074 B-2 (PMF) - Qualified
Typical Physical and Application Properties
Color: Base - Yellow, Accelerator - Black
Mix Ratio: 100 base / 10 accelerator (by weight)
Nonvolatile Content: 98%
Base Viscosity (RVF Brookfield #7 Spindle @ 2rpm): 6,000 - 9,000 poise
Application Life and Cure Time
(At 75 degrees F, 50% Relative Humidity)
Minimum Application Life*: 1/2 hour
Typical Tack-Free Time**: 6 hours
Typical Cure Time***: 12 hours
Minimum Application Life*: 2 hours
Typical Tack-Free Time**: 20 hours
Typical Cure Time***: 60 hours
*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
**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-665 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) 120 degrees F.
Typical Physical and Performance Properties of Cured Compound when tested per STM 40-111 and MIL-PRF-81733
Specific Gravity: 1.60
Hardness: 52 Shore "A"
Low Temperature Flexibility: No cracking, checking or adhesion loss when tested at -65 degrees F (-54 degrees C)
Thermal Stability, 48 hours at 200 degrees F: Does not soften, blister, crack or blow
Service Temperatures: -65 degrees to +250 degrees F (-55 degrees to +121 degrees C)
Tensile Strength: 250 psi
Corrosion: Excellent protection from corrosion caused by galvanic coupling of dissimilar metals
Soluble Chromate Content: 4-5%
Repairability: 35-piw/100% cohesive to itself and other STM 40-111 and MIL-PRF-81733 qualified sealants
Fungus Resistance: Non-nutrient