3M AC-770 Class B-2 Aerospace Sealant

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3M AC-770 Class B-2 Aerospace Sealant
Categories:	Polymer; Thermoset; Polysulfide Sealant/Adhesive
Material Notes:	3M Aerospace Sealant AC-770 Class B are fast cure, low density two-component, manganese dioxide cure, polysulfide fuselage sealants. 3M AC-770 Class B Sealants have outstanding resistance to aviation gasoline and jet fuel, as well as resistance to chemicals and petroleum products common to the aircraft industry. 3M AC-770 Class B Sealants maintain flexibility and bond strength on most metal substrates like aluminum, titanium, stainless steel, steel, and many coatings under extremes of temperature, weathering and stress. The mixed compound is a thixotropic paste easily applied by extrusion, injection gun or spatula. They have excellent tooling properties. Information provided by 3M
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Physical Properties	Metric	English	Comments

Density	1.10 g/cc	0.0397 lb/in³	cured 14 days @ 50% RH
Volatiles	1.5 %	1.5 %
Brookfield Viscosity	950000 - 1.30e+6 cP	950000 - 1.30e+6 cP	Base, RVF #7 sp @ 2 rpm

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	42 - 48	42 - 48	cured 14 days @ 50% RH
Tensile Strength at Break	1.72 MPa @Temperature 336 °C	249 psi @Temperature 637 °F	Standard Cure in ASTM Fuel B in ASTM D471 Reference Fuel B
	1.83 MPa @Treatment Temp. 49.0 °C, Time 173000 sec	265 psi @Treatment Temp. 120 °F, Time 48.0 hour
Elongation at Break	330 %	330 %	7 days @ 49°C in ASTM Fuel B 48 hrs @ 49°C
	310 % @Time 1.21e+6 sec	310 % @Time 336 hour	Standard Cure in ASTM Fuel B in ASTM D471 Reference Fuel B

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

Processing Properties	Metric	English	Comments
Cure Time	540 - 660 min	9.00 - 11.0 hour
Tack-Free Time	420 - 480 min	7.00 - 8.00 hour
Shelf Life	9.00 Month @Temperature <=26.7 °C	9.00 Month @Temperature <=80.1 °F

Descriptive Properties
Appearance	Brown		Accelerator
	Dark Brown
	Off White		Base

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.

PMM35409 / 170156

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