3M™ Aerospace Sealant AC-251 is our two-part, manganese dioxide cured, polysulfide based sealant for aircraft windshields, canopies and windows. This quick curing product is easy to tool, and the non-sag formula holds its shape on vertical and horizontal surfaces. AC-251 is effective for acrylic, glass, and polycarbonate aircraft transparencies and exterior mold line applications.
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Application
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Sealing
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Application Life
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1 Minute, 2 Hour, 30 Hour |
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Container Size (Imperial)
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1 Gallon, 1 Ounce, 1 Ounce, 2.5 Quart, 5 Ounce, 6 Pint
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Cure Type
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Fast Cure
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Factory ISO Certification
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No ISO Certification information available
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Product Color
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Black
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Product Form
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Kit
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Too See 3M™ Aerospace Sealant AC-251 technical data sheet (TDS) and the 3M™ Aerospace Sealant AC-251 safety data sheet (SDS). Visit here
3M AC-251 is a two-part, quick-curing polysulfide sealant specifically formulated for sealing aircraft windshields, canopies, and windows. Its "non-crazing" formula makes it safe for use on acrylic, polycarbonate, and glass transparencies, providing a durable, weather-resistant exterior mold line seal.
No, 3M AC-251 contains no added solvents. This is a critical feature because solvents can cause "crazing" (fine surface cracking) in sensitive aircraft plastics like acrylic and polycarbonate. By being solvent-free, AC-251 ensures the optical clarity and structural integrity of the aircraft's windows.
3M AC-251 is available in several work-life versions to suit different repair needs:
Yes, AC-251 is formulated to resist UV degradation and weather exposure, which is essential for exterior seals. It also features outstanding resistance to aviation fuel and petroleum products, allowing it to maintain a pressure-tight seal in demanding flight environments.
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