3M AC-251 Black Class B-1/2 Aerospace Sealant

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3M AC-251 Black Class B-1/2 Aerospace Sealant
Categories:	Polymer; Thermoset
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	Metric	English	Comments

Density	1.59 g/cc	0.0574 lb/in³	cured 14 days @ 50% RH; AMS-S-8802
Volatiles	2.0 %	2.0 %
Brookfield Viscosity	900000 - 1.60e+6 cP	900000 - 1.60e+6 cP	Base, RVF #7 sp @ 2 rpm

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	55	55	cured 14 days @ 50% RH; AMS-S-8802
Tensile Strength at Break	2.41 MPa @Time 1.21e+6 sec	350 psi @Time 336 hour	Standard Cure
	2.14 MPa @Treatment Temp. 121 °C, Time 605000 sec	310 psi @Treatment Temp. 250 °F, Time 168 hour
Elongation at Break	370 % @Time 1.21e+6 sec	370 % @Time 336 hour	Standard Cure
	300 % @Treatment Temp. 121 °C, Time 605000 sec	300 % @Treatment Temp. 250 °F, Time 168 hour

Thermal Properties	Metric	English	Comments
Maximum Service Temperature, Air	121 °C	250 °F	AMS-S-8802, cured 14 days @ 50% RH
	182 °C	360 °F	AMS-S-8802, cured 14 days @ 50% RH
Minimum Service Temperature, Air	-54.0 °C	-65.2 °F	AMS-S-8802, cured 14 days @ 50% RH

Processing Properties	Metric	English	Comments
Cure Time	240 min	4.00 hour
Tack-Free Time	240 min	4.00 hour
Shelf Life	9.00 Month @Temperature <=26.7 °C	9.00 Month @Temperature <=80.1 °F

Descriptive Properties
Appearance	Black
	Black		Base
	Black		Accelerator

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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PMM35414 / 170161

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