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	Original Value	Comments

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

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

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

Processing Properties	Original Value	Comments
Cure Time	9.00 - 11.0 hour
Tack-Free Time	7.00 - 8.00 hour
Shelf Life	9.00 Month @Temperature <=26.7 °C

Descriptive Properties
Appearance	Brown	Accelerator
	Dark Brown
	Off White	Base

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PMM35409 / 170156

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