3M AC-350 Class B-2 Aerospace Sealant

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3M AC-350 Class B-2 Aerospace Sealant
Categories:	Polymer; Thermoset; Polysulfide Sealant/Adhesive
Material Notes:	3M Aerospace Sealant AC-350 Class B are fast-cure, intermediate density polysulfide sealant suitable fro fuel tank and fuselage applications. These two-component, manganese dioxide cured sealant are solvent free and have resistance to aviation gasoline and jet fuel, as well as resistance to chemicals and petroleum products common to the aircraft industry. 3M AC-350 Class B Sealants maintain flexibility and bond strength on most metal substrates such as aluminum, titanium, steel, stainless steel, glass, 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, and exhibits good tooling properties. Information provided by 3M
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Physical Properties	Original Value	Comments

Density	<= 1.40 g/cc	cured 14 days @ 50% RH
Volatiles	2.0 %
Brookfield Viscosity	900000 - 1.20e+6 cP	Base, RVF #7 sp @ 2 rpm

Mechanical Properties	Original Value	Comments
Hardness, Shore A	50 - 55	cured 14 days @ 50% RH
Tensile Strength at Break	1.51 MPa	Standard Heat cycle + JRF-12 days @ 60°C, 60 hrs @ 71°C, 6 hrs @ 82°C + 24 hrs at 49°C
	1.65 MPa	24 hrs @ 121°C, and JRF-7 days @ 60°C
	1.79 MPa	Standard Cure-14 days
	1.38 MPa @Temperature 60.0 °C	JRF-14 days
	2.28 MPa @Treatment Temp. 182 °C, Time 28800 sec
	2.55 MPa @Treatment Temp. 121 °C, Time 605000 sec
Elongation at Break	42 %	Standard Heat cycle + JRF-12 days @ 60°C, 60 hrs @ 71°C, 6 hrs @ 82°C + 24 hrs at 49°C
	260 %	24 hrs @ 121°C, and JRF-7 days @ 60°C
	500 %	Standard Cure-14 days
	540 % @Temperature 60.0 °C	JRF-14 days
	100 % @Treatment Temp. 182 °C, Time 28800 sec
	125 % @Treatment Temp. 121 °C, Time 605000 sec

Thermal Properties	Original Value	Comments
Maximum Service Temperature, Air	121 °C	cured 14 days @ 50% RH
	182 °C	Short term, cured 14 days @ 50% RH
Minimum Service Temperature, Air	-54.0 °C	cured 14 days @ 50% RH

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

Descriptive Properties
Appearance	Brown	Accelerator
	Dark Gray
	Off White	Base

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PMM35386 / 170133

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