3M AC-251 Black Class B-2 Aerospace Sealant

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3M AC-251 Black Class B-2 Aerospace Sealant
Categories:	Polymer; Thermoset; Polysulfide Sealant/Adhesive
Material Notes:	3M Aerospace Sealant AC-251 Black 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 Black Class B Sealants contain no solvents and do not craze. The sealants quickly cure and exhibit excellent adhesion and resistance to UV and weather exposure. 3M AC-251 Black Class B Sealants have a thixotropic, non-sag consistency. They can be readily applied with a spatula or extrusion gun on vertical surfaces. Information provided by 3M
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Physical Properties	Original Value	Comments

Density	1.59 g/cc	cured 14 days @ 50% RH; AMS-S-8802
Volatiles	2.0 %
Brookfield Viscosity	900000 - 1.60e+6 cP	Base, RVF #7 sp @ 2 rpm

Mechanical Properties	Original Value	Comments
Hardness, Shore A	55	cured 14 days @ 50% RH; AMS-S-8802
Tensile Strength at Break	2.41 MPa @Time 1.21e+6 sec	Standard Cure
	2.14 MPa @Treatment Temp. 121 °C, Time 605000 sec
Elongation at Break	370 % @Time 1.21e+6 sec	Standard Cure
	300 % @Treatment Temp. 121 °C, Time 605000 sec

Thermal Properties	Original Value	Comments
Maximum Service Temperature, Air	121 °C	AMS-S-8802, cured 14 days @ 50% RH
	182 °C	AMS-S-8802, cured 14 days @ 50% RH
Minimum Service Temperature, Air	-54.0 °C	AMS-S-8802, cured 14 days @ 50% RH

Processing Properties	Original Value	Comments
Cure Time	9.00 hour
Tack-Free Time	8.00 hour
Shelf Life	9.00 Month @Temperature <=26.7 °C

Descriptive Properties
Appearance	Black
	Black	Base
	Black	Accelerator

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PMM35416 / 170163

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