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

Category	Polymer , Thermoset
Manufacturer	3M
Trade Name
Port	Ningbo port,China
Trade Terms	FOB, CFR, CIF
Payment Terms	L/C, T/T, Western Union
Download PDF	3M AC-251 Gray Class B-2 Aerospace Sealant.pdf
Price	EMAIL US sales@lookpolymers.com

Material Notes:

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 solvents 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.Information provided by 3M

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	2.14 MPa @Temperature 121 °C, Time 605000 sec	310 psi @Temperature 250 °F, Time 168 hour
	2.41 MPa @Time 1.21e+6 sec	350 psi @Time 336 hour	Standard Cure
Elongation at Break	300 % @Temperature 121 °C, Time 605000 sec	300 % @Temperature 250 °F, Time 168 hour
	370 % @Time 1.21e+6 sec	370 % @Time 336 hour	Standard Cure

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	480 min	8.00 hour	Tack-Free Time
	540 min	9.00 hour
Shelf Life	9.00 Month @Temperature <=26.7 °C	9.00 Month @Temperature <=80.1 °F

Descriptive Properties	Value	Comments
Appearance	Black	Accelerator
	Gray
	White	Base

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