AS3349 FAA-PMA Gray Silicone Adhesive Sealant – 3 oz for Aircraft Maintenance

Aerospace Sealants AS3349 is an advanced-formula, FAA-PMA qualified gray silicone adhesive sealant engineered for demanding aircraft maintenance and repair applications. Meeting the AS3349 aerospace standard, it delivers superior bonding, sealing, and gasketing performance on metal, composite, and glass aircraft surfaces with excellent durability across the operational temperature and environmental exposure range of commercial and military aircraft.

AS3349 provides enhanced performance characteristics compared to standard silicone sealants, including improved adhesion on difficult substrates, better resistance to aerospace fluids, and superior mechanical properties in the cured film. These advanced properties make it suitable for applications where standard silicone sealants may not meet performance requirements.

The 3 oz tube provides convenient hand-application for spot repairs, maintenance sealing operations, and small bonding jobs. The tube format allows precise placement of sealant without the need for cartridge gun equipment, making it practical for field maintenance teams and line maintenance operations.

Technical Information

AS3349 utilizes an advanced one-component silicone rubber formulation that achieves its superior performance through an optimized polymer backbone and cross-linking chemistry designed specifically for aerospace applications. The moisture-cure RTV mechanism provides reliable room-temperature curing without the need for elevated temperature post-cure, enabling immediate return-to-service after the specified cure time has elapsed.

The cured AS3349 film maintains its key mechanical properties — tensile strength, elongation at break, and adhesion — across a broad service temperature range. Its resistance to UV radiation, ozone, and weathering ensures the sealant maintains its integrity on aircraft exterior surfaces exposed to direct sunlight and environmental elements over extended service periods.

AS3349 is formulated to resist a broad spectrum of aircraft maintenance chemicals including hydraulic fluid mist, lubricating oils, fuel vapors, and standard aircraft cleaning agents. Proper surface cleaning is required before application to ensure maximum adhesion performance. The gray color pigmentation is stable and UV-resistant, maintaining its appearance throughout the sealant’s service life.

Why Choose AS3349 Gray Silicone Sealant?

• ✅ FAA-PMA Approved — Regulatory compliant for certificated aircraft
• ✅ Advanced Formula — Enhanced adhesion and chemical resistance
• ✅ Gray Color — Aesthetically matches aircraft structures and surfaces
• ✅ 3 oz Tube — Field-friendly for line maintenance and spot repairs
• ✅ RTV Cure — Room temperature cure, no special equipment required

Applications and Compatible Aircraft

AS3349 is used for aircraft fairing bonding, panel edge sealing, non-structural joint sealing, electrical enclosure gasketing, and general maintenance repair sealing on commercial, business, and military aircraft where FAA-PMA approved advanced silicone sealant is specified.

Frequently Asked Questions

Q: What is the difference between AS3349 and AS157?
A: Both are gray FAA-PMA silicone sealants in 3 oz tubes, but AS3349 is an advanced formula with enhanced adhesion and chemical resistance properties. AS3349 is suitable for more demanding applications where standard silicone sealant performance may be insufficient.

Q: Is AS3349 suitable for aircraft exterior applications?
A: Yes. AS3349 is formulated to resist UV radiation, weathering, and environmental exposure, making it suitable for aircraft exterior sealing and bonding applications.

Q: What is the MPN for AS3349 3oz gray tube?
A: The Manufacturer Part Number is AS3349G. Specification: AS3349 FAA-PMA.

Q: Does AS3349 require surface preparation before application?
A: Yes. Surfaces should be thoroughly cleaned and degreased before applying AS3349 to achieve maximum adhesion. Follow the AS3349 technical data sheet surface preparation requirements for your specific substrate.

Q: What is the cure mechanism for AS3349?
A: AS3349 cures through room-temperature vulcanization (RTV) by reacting with atmospheric moisture, forming a durable silicone elastomer without heat or special equipment. Refer to the TDS for cure schedule at various temperatures and humidity conditions.