3M AC-240 Class B-2 Aerospace Sealant

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3M AC-240 Class B-2 Aerospace Sealant
Categories:	Polymer; Thermoset; Polysulfide Sealant/Adhesive
Material Notes:	3M Aerospace Sealant AC-240 Class B is a two-part, polysulfide-based, long application life, quick cure product for use as a sealant for integral fuel tanks and fuselages. This tow-component, manganese dioxide cured sealant is solvent free and has outstanding resistance to aviation gasoline and jet fuel, as well as resistance to chemicals and petroleum products common to the aircraft industry. 3M AC-240 Class B Sealants maintains flexibility and bond strength on most metal substrates like aluminum, titanium, stainless steel, steel, glass and many coatings under extremes of temperature, weathering and stress. The mixed compound has a low-sag consistency and can be readily applied with a spatula or extrusion gun on vertical surfaces. Information provided by 3M
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Physical Properties	Original Value	Comments

Density	1.61 g/cc	cured 14 days @ 50% RH; AMS-S-8802
Volatiles	2.0 %
Brookfield Viscosity	900000 - 1.40e+6 cP	RVF #7 sp @ 2 rpm

Mechanical Properties	Original Value	Comments
Hardness, Shore A	50	cured 14 days @ 50% RH
Tensile Strength at Break	1.65 MPa	24 hrs @ 121°C, and JRF-7 days @ 60°C
	2.07 MPa	Standard Cure - 14 days
	2.76 MPa	JRF- 72 hrs @ 60°C, and 72 hrs @ 49°C, and 7 days @ 121°C
	1.72 MPa @Time 216000 sec	JRF-14 days
	2.90 MPa @Time 436000 sec	JRF-7 days
Elongation at Break	200 %	JRF- 72 hrs @ 60°C, and 72 hrs @ 49°C, and 7 days @ 121°C; AMS-S-8802
	360 %	24 hrs @ 121°C, and JRF-7 days @ 60°C; AMS-S-8802
	370 %	Standard Cure - 14 days; AMS-S-8802
	200 % @Temperature 121 °C	JRF-7 days; AMS-S-8802
	296 % @Temperature 60.0 °C	JRF-14 days; AMS-S-8802

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	10.0 hour
Tack-Free Time	9.00 hour
Shelf Life	9.00 Month @Temperature <=26.7 °C

Descriptive Properties
Appearance	Dark Brown	Accelerator
	Gray
	White	Base

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PMM35376 / 170123

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