3M™ Aerospace Sealant, Polysulfide, Liquid, Black, Slight, 4 hr, 2 oz Cartridge

3M™ aerospace sealant AC-251 gray class B are two-part, quick curing, polysulfide-based canopy and windshield sealants. These products are formulated for sealing acrylic, glass and polycarbonate aircraft canopies and windshields. 3M™ AC-251 gray class B sealants contain no solvent and do not craze. The sealants quickly cure and exhibit excellent adhesion and resistance to UV and weather exposure. 3M™ AC-251 gray class B sealants have a thixotropic, non-sag consistency. They can be readily applied with a spatula or extrusion gun on vertical surfaces.

Features
• Maintains flexibility and bond strength for reliable performance on aircraft transparencies
• Contains no added solvents to prevent crazing on transparent surfaces
• Formulated to resist UV degradation
• Black color provides clean exterior mold lines
• Non-sag formula is easy-to-mix and apply by injection dispenser or spatula for fast application time
• Qualified to multiple aerospace material specifications

Specifications
• Series: AC-251 B-1/2
• Container Type: Cartridge
• Container Size: 2 oz
• Base Type: Polysulfide
• Form: Liquid
• Color: Black
• Odor/Scent: Slight
• Composition: 30 to 50% Manganese Dioxide, 30 to 45% Hydrogenated Terphenyl, <=10% Partially Hydrogenated Polyphenols, <=5% Aluminum Oxide, 1 to 5% Terphenyl, 1 to 3% Carbon Black, 1 to 3% Dipentamethylenethiuram Hexasulfur, <=3% Iron Oxide (Fe2O3), 0.1 to 3% Quartz Silica, 0.1 to 3% Water, 0.1 to 1% Ferbam, <=1% Sodium Hydroxide, <=0.66% Lead
• Curing Time: 4 hr
• Flash Point: >=200 deg F
• Specific Gravity: 1.59
• Viscosity: 9000 to 16000 poise
• Density: 1.59 g/mL
• VOC Content: 2.1 to 2.2 g/L
• Applicable Materials: Acrylic, Glass, Polycarbonate
• Temperature Rating: -65 to 250 deg F Service
• Application Life: 1/2 hr
• Tack-Free Time: 4 hr
• Hardness Rating: 55 Shore A
• Shelf Life: 9 months
• Non-Volatile Content: 98 %

Applications
• For canopy and windshield sealant exterior moldline applications