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AC Tech AC 240 Class B Quick Cure Fuel Tank & Fuselage Sealant - ½ Hour Application Time
AC Tech AC 240 Class B Quick Cure Fuel Tank & Fuselage Sealant - ½ Hour Application Time
Product Description
AC240B-1-2 AC Tech Quick Cure Fuel Tank & Fuselage Sealant is a two-part, polysulfide based product for use as a quick cure sealant for integral fuel tanks and fuselages. Long application life, quick cure integral fuel tank and fuselage sealant.
Base - Material Safety Data Sheets (MSDS)
Mixed - Material Safety Data Sheets (MSDS)
Accelerator - Material Safety Data Sheets (MSDS)
Product Specifications
AMS-S-8802 - B-1/2, B-2, B-4 Qualified
BMS 5-26U Type II - Meets requirements
CML 09-043 - B-1/2, B-2 Qualified
GAMPS 7115 - B-1/2, B-2 Qualified
MB 1218AF - B-1/2, B-2 Qualified
MEP-09-069 - B-1/2, B-2 Qualified
NA-66-1032 - B-1/2, B-2 Qualified
P.S. 11346 - B-1/2 Qualified
P.S. 2 - B-1/2, B-2 Qualified
P.S. 3 - B-1/2, B-2 Qualified
RIL 8-20-005 - Approved
RIL-84-51-002 - Approved
RLD.JA.001 - B-1/2, B-2 Qualified
TAPS 1163 Type I - Qualified
STRP 5960 rev E - B-1/2, B-2 Qualified
STM 40-113 - B-1/4 Qualified
Vought 206-6-466 - B-1/2, B-2 Qualified

Typical Physical and Application Properties

  • Color: Base - White, Accelerator - Dark Brown

  • Mixing Ratio: 100 base / 10 accelerator (by weight and volume)

  • Nonvolatile Content: 98%

  • Viscosity (Brookfield #7 Spindle @ 2rpm): 9,000-12,000 poise
  • Application Life and Cure Time


  • Minimum Application Life*: 1/4 hour

  • Typical Tack-Free Time**: 90 minutes

  • Typical Cure Time***: 90 minutes
  • B-1/2

  • Minimum Application Life*: 1/2 hour

  • Typical Tack-Free Time**: 4 hours

  • Typical Cure Time***: 4 hours
  • B-2

  • Minimum Application Life*: 2 hours

  • Typical Tack-Free Time**: 9 hours

  • Typical Cure Time***: 10 hours
  • B-4

  • Minimum Application Life*: 4 hours

  • Typical Tack-Free Time**: 26 hours

  • Typical Cure Time***: 26 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.

    Typical Physical and Performance Properties of Cured Compound After 14 Days at 77 degrees F / 50% Relative Humidity when tested per AMS-S-8802

  • Color: Gray

  • Specific Gravity: 1.61

  • Hardness: 60 Shore "A"

  • Low Temperature Flexibility: No cracking, checking or adhesion loss when tested at -65 degrees F (-54 degrees C)

  • Service Temperatures: -65 degrees to +250 degrees F (-54 degrees to +121 degrees C)

  • Intermittent Exposure To: 360 degrees F (182 degrees C)

  • Thermal Rupture Resistance: Does not blister or sponge

  • Corrosion: None

  • Repairability: 35 piw to itself and other AMS-S-8802 qualified sealants

  • Weight Loss and Flexibility: No cracking when bent 180 degrees over a 1/8" mandrel. No more than 6% loss of the sealant compound after fluid immersion

  • Fungus Resistance: Meets MIL-STD 810 requirement

  • Crazing: No effect on acrylic or polycarbonate

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