3M AC-370 Class B-1/2 Aerospace Sealant

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3M AC-370 Class B-1/2 Aerospace Sealant
Categories:	Polymer; Thermoset; Polysulfide Sealant/Adhesive
Material Notes:	3M Aerospace Sealant AC-370 Class B are fast cure, low density polysulfide sealants suitable for fuel tank and fuselage applications. These two-component, manganese dioxide cured sealants are solvent free and have outstanding resistance to aviation gasoline and jet fuel, as well as resistance to chemicals and petroleum product common to the aircraft industry. 3M AC-370 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	<= 1.30 g/cc	cured 14 days @ 50% RH
Volatiles	2.5 %
Brookfield Viscosity	900000 - 1.60e+6 cP	RVF #7 sp @ 2 rpm

Mechanical Properties	Original Value	Comments
Hardness, Shore A	50 - 55	cured 14 days @ 50% RH
Tensile Strength at Break	1.25 MPa	12 days @ 60°C + 60 hrs @ 71°C + 6 hrs @ 82°C in JRF I
	1.72 MPa	Standard Cure
	1.72 MPa	Standard heat cycle (AMS)
	1.82 MPa	12 days @ 60°C + 60 hrs @ 71°C + 6 hrs @ 82°C in JRF I + 24 hrs air dry @ 49°C + standard heat cycle (AMS)
	1.91 MPa	72 hrs at standard temperature in AMS 3021
	1.91 MPa	72 hrs at standard temperature in AMS 3020
Elongation at Break	55 %	Standard heat cycle (AMS)
	56 %	12 days @ 60°C + 60 hrs @ 71°C + 6 hrs @ 82°C in JRF I + 24 hrs air dry @ 49°C + standard heat cycle (AMS)
	407 %	12 days @ 60°C + 60 hrs @ 71°C + 6 hrs @ 82°C in JRF I
	412 %	Standard Cure
	452 %	72 hrs at standard temperature in AMS 3021
	452 %	72 hrs at standard temperature in AMS 3020

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	6.00 - 7.00 hour
Tack-Free Time	6.00 - 7.00 hour
Shelf Life	9.00 Month @Temperature <=26.7 °C

Descriptive Properties
Appearance	Brown	Accelerator
	Dark Gray
	Off White	Base

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