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AC240-B2 3M Aerospace Sealant 1-Quart Kit Quick Cure Fuel Tank & Fuselage Sealer
AC-240 Class B is a two-part, polysulfide based product for use as a quick cure sealant for integral fuel tanks and fuselages. The mixed compound has a thixotropic non-sag consistency and can be readily applied with a spatula or extrusion gun or vertical surfaces. It will cure to a fuel-resistant rubber at temperature above 20ºF and exhibits excellent tooling properties with very low shrinkage. Long application life, quick cure integral fuel tank and fuselage sealant.
24 oz AC240-B2 3M Aerospace Sealant 1- Pint Kit Quick Cure Fuel Tank & Fuselage Sealer
24 oz Class BCure Time: 2 hours Integral Fuel Tank Sealant - Meets AMS-S-8802, Type II, Class B 2 Sealant. AC-240 Class B is a two-part, polysulfide based product for use as a quick cure sealant for integral fuel tanks and fuselages. The mixed compound has a thixotropic non-sag consistency and can be readily applied with a spatula or extrusion gun or vertical surfaces. It will cure to a fuel-resistant rubber at temperature above 20 degrees F and exhibits excellent tooling properties with very low shrinkage. Long application life, quick cure integral fuel tank and fuselage sealant.Application Life and Cure Time:
Minimum Application Life*: 2 hours Typical Tack-Free Time**: 9 hours Typical Cure Time***: 10 hours *Application life refers to the length of time the mixed compound remains at a consistency suitable for application with spatula or caulking gun. Application life is always measured as a standard temperature of 77 degrees F with a relative humidity level of 50%. In general, for every 20 degree F rise in temperature, the application life is halved; and for every 20 degree F 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-240 Class B sealant to reach 30A hardness. It depends on three factors: remaining application life, temperature and relative humidity. The temperature/humidiity factors for application life also apply to curing. To accelerate the curing process, apply heat up to (but not more than) 140 degrees F.
Mixing Instructions for Two-Part Sealant Cartridges: Holding the cartridge, grasp the dasher rod and pull back approximately one inch. 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 catalyst in one location. Distribute evenly throughout base material. Repeat steps 2 and 3 until all the contents of the rod are emptied into the cartridge. Remove the ramrod. Mix for the required number of strokes (hand mixing) or for the required amount of time (machine mixing) indicated in the kit instructions. When mixing is complete, remove bottom cap. Pull the dasher rod back to the neck of the cartridge, grasp the cartridge firmly at the neck, unscrew the dasher rod and remove. 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.
Storage: The shelf life of AC-240 Class B is 9 months from date of packaging, when stored at temperatures below 80 degrees F in its original container. Mixed AC-240 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.
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