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3M AC-240 Class B-4 Aerospace Sealant

Category Polymer , Thermoset
Manufacturer 3M
Trade Name
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF 3M AC-240 Class B-4 Aerospace Sealant.pdf
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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
Physical Properties Metric English Comments
Density 1.61 g/cc
0.0582 lb/in³
cured 14 days @ 50% RH; AMS-S-8802
Volatiles 2.0 %
2.0 %
Brookfield Viscosity 900000 - 1.40e+6 cP
900000 - 1.40e+6 cP
RVF #7 sp @ 2 rpm
Mechanical Properties Metric English Comments
Hardness, Shore A 50
50
cured 14 days @ 50% RH
Tensile Strength at Break 1.65 MPa
239 psi
24 hrs @ 121°C, and JRF-7 days @ 60°C
2.07 MPa
300 psi
Standard Cure - 14 days
2.76 MPa
400 psi
JRF- 72 hrs @ 60°C, and 72 hrs @ 49°C, and 7 days @ 121°C
1.72 MPa

@Time 216000 sec
249 psi

@Time 60.0 hour
JRF-14 days
2.90 MPa

@Time 436000 sec
421 psi

@Time 121 hour
JRF-7 days
Elongation at Break 200 %
200 %
JRF- 72 hrs @ 60°C, and 72 hrs @ 49°C, and 7 days @ 121°C; AMS-S-8802
360 %
360 %
24 hrs @ 121°C, and JRF-7 days @ 60°C; AMS-S-8802
370 %
370 %
Standard Cure - 14 days; AMS-S-8802
200 %

@Temperature 121 °C
200 %

@Temperature 250 °F
JRF-7 days; AMS-S-8802
296 %

@Temperature 60.0 °C
296 %

@Temperature 140 °F
JRF-14 days; AMS-S-8802
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 1800 min
30.0 hour
Tack-Free Time
1800 min
30.0 hour
Shelf Life 9.00 Month

@Temperature <=26.7 °C
9.00 Month

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