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3M AC-370 Class B-2 Aerospace Sealant

Category Polymer , Thermoset
Manufacturer 3M
Trade Name
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF 3M AC-370 Class B-2 Aerospace Sealant.pdf
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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
Physical Properties Metric English Comments
Density <= 1.30 g/cc
<= 0.0470 lb/in³
cured 14 days @ 50% RH
Volatiles 2.5 %
2.5 %
Brookfield Viscosity 900000 - 1.60e+6 cP
900000 - 1.60e+6 cP
RVF #7 sp @ 2 rpm
Mechanical Properties Metric English Comments
Hardness, Shore A 50 - 55
50 - 55
cured 14 days @ 50% RH
Tensile Strength at Break 1.25 MPa
181 psi
12 days @ 60°C + 60 hrs @ 71°C + 6 hrs @ 82°C in JRF I
1.72 MPa
249 psi
Standard Cure
1.72 MPa
249 psi
Standard heat cycle (AMS)
1.82 MPa
264 psi
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
277 psi
72 hrs at standard temperature in AMS 3021
1.91 MPa
277 psi
72 hrs at standard temperature in AMS 3020
Elongation at Break 55 %
55 %
Standard heat cycle (AMS)
56 %
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 %
407 %
12 days @ 60°C + 60 hrs @ 71°C + 6 hrs @ 82°C in JRF I
412 %
412 %
Standard Cure
452 %
452 %
72 hrs at standard temperature in AMS 3021
452 %
452 %
72 hrs at standard temperature in AMS 3020
Thermal Properties Metric English Comments
Maximum Service Temperature, Air 121 °C
250 °F
cured 14 days @ 50% RH
182 °C
360 °F
Short term, cured 14 days @ 50% RH
Minimum Service Temperature, Air -54.0 °C
-65.2 °F
cured 14 days @ 50% RH
Processing Properties Metric English Comments
Cure Time 420 - 480 min
7.00 - 8.00 hour
Tack-Free Time
480 - 600 min
8.00 - 10.0 hour
Shelf Life 9.00 Month

@Temperature <=26.7 °C
9.00 Month

@Temperature <=80.1 °F
Descriptive Properties Value Comments
Appearance Brown
Accelerator
Dark Gray
Off White
Base
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