AC Tech AC-350 B-1/4 Intermediate Density Fuel Tank & Fuselage Sealant Catalyst - Quick Cure - 2.5 oz.

This fast cure, intermediate density polysulfide sealant suitable for fuel tank and fuselage applications is a two-component, manganese dioxide cured sealant that is solvent free and has outstanding resistance to aviation gasoline and jet fuel, as well as resistance to chemicals and petroleum products common to the aircraft industry. AC-350 Class B maintains its flexibility and bond strength on most metal substrates such as" aluminum, titanium, steel, stainless steel, glass, and many coatings under extremes of temperature, weathering and stress. The mixed compound is a thixotropic paste easily applied by extrusion, injection gun or spatula, and exhibits superb tooling properties.

Applications

• Sealing integral fuel tanks
• Repairing integral fuel tanks
• Sealing fuselages

SIN #834-100

Storage

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

Mixed AC-350 Class B may be stored under refrigeration as follows

15 days at -10°F
30 days at - 40°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 of available application time.

Please note, this is the catalyst component only. We also have AC Tech AC-350 B-1/4 Intermediate Density Fuel Tank & Fuselage Sealant Base Component available.

AMS-S-8802 - B-1/2, B-2, B-4 Qualified
MMS-332 - Qualified Grade 2
AMS 3276 - B-1/4, B-1/2, B-2, B-4, B-6, B-12 Qualified

Typical Physical and Application Properties Color Base Accelerator Off-White Brown Mix Ratio (by weight) B-1/4 100 base / 10 catalyst 100 base/12.5 catalyst Nonvolatile Content 98% Base Viscosity (RVF Brookfield #7 Spindle @ 2 rpm, 77°) 9,00 - 12,000 poise

Application Life and Cure Time Min. Application Life* Typical Tack-Free Time** Typical Cure Time*** Tested @ 75°F, 50% R.H. B-1/4 15 minutes 1/2 hour 1/2 hour B-1/2 30 minutes 2-3 hours 2-3 hours B-2 2 hours 7-8 hours 7-8 hours B-4 4 hours 32-36 hours 32-36 hours B-6 6 hours 36-40 hours 36-40 hours B-12 12 hours 96 hours 96 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°F with a relative humidity level of 50%. In general, for every 20°F rise in temperature, the application life is halved; and for every 20°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-350 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, heat may be applied up to (but not more than) 140°F.

Typical Physical and Performance Properties* Color Dark Gray Specific Gravity 1.40 max. Hardness 50-55 Shore "A" Low Temperature Flexibility No cracking, checking or adhesion loss when tested at -65°F (-54°C) Service Temperatures -65° to +360°F (-55° to +182°C) and short term to 360°F (182°C) Thermal Rupture Resistant Conforms Corrosion None Repairability 45 piw / 100% cohesive failure Weight Loss in JRF 3-4% Crazing No effect on acrylic or polycarbonate

* Of cured compound after 14 days @ 77°F/50% RH