3M AC-645 B-2 Aerospace Sealant

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3M AC-645 B-2 Aerospace Sealant
Categories:	Polymer; Thermoset; Polysulfide Sealant/Adhesive
Material Notes:	3M Aerospace Sealant AC-645 B-2 is a low density, two-component, manganese dioxide cured, liquid polysulfide polymer system. It is suitable for use in fuel tanks, fuselage hole filling, cavity filling and fuel tank filleting applications. It has outstanding resistance to jet fuel, as well as resistance to chemicals, and petroleum products common to the aircraft industry. 3M AC-645 B-2 Sealant maintains its flexibility and bond strength on most meal substrates such as aluminum, titanium, steel, stainless 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. It has excellent tooling properties. Information provided by 3M
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Physical Properties	Original Value	Comments

Density	1.07 g/cc	cured 14 days @ 50% RH; STM 40-107
Volatiles	3.0 %
Brookfield Viscosity	70000 - 160000 cP	Accelerator, RVF #7 sp @ 10 rpm
	800000 - 1.20e+6 cP	Base, RVF #7 sp @ 2 rpm

Mechanical Properties	Original Value	Comments
Hardness, Shore A	55	cured 14 days @ 50% RH; STM 40-107
Tensile Strength at Break	1.07 MPa	Standard Cure; STM 40-107
	0.827 MPa @Treatment Temp. 60.0 °C, Time 605000 sec	STM 40-107
Elongation at Break	170 %	Standard Cure; STM 40-107
	270 % @Treatment Temp. 60.0 °C, Time 605000 sec	STM 40-107
Peel Strength	18.0 pli	Dry-Std, Alclad; STM 40-107
	12.0 pli @Temperature 60.0 °C, Time 605000 sec	JRF, Alclad; STM 40-107
	12.0 pli @Temperature 60.0 °C, Time 6.05e+6 sec	JRF, Alclad; STM 40-107

Thermal Properties	Original Value	Comments
Maximum Service Temperature, Air	121 °C	STM 40-107, cured 14 days @ 50% RH
Minimum Service Temperature, Air	-54.0 °C	STM 40-107, cured 14 days @ 50% RH

Processing Properties	Original Value	Comments
Cure Time	24.0 hour
Tack-Free Time	24.0 hour
Shelf Life	9.00 Month @Temperature <=26.7 °C

Descriptive Properties
Appearance	Black
	Black	Accelerator
	Off White	Base

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PMM35419 / 170166

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