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Master Bond adhesives

3M AC-250 B-1/6 Aerospace Sealant
Categories: Polymer; Thermoset; Polysulfide Sealant/Adhesive

Material Notes: 3M Aerospace Sealant AC-250 B-1/6 is a two-part, polysulfide, quick repair sealant for integral fuel tank and fuselage sealing applications. The mixed compound is a thixotropic paste and can be readily applied with a spatula or extrusion gun. It will cure to a fuel-resistant rubber at temperatures above -6.7°C. It exhibits excellent tooling properties.

Information provided by 3M

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Physical PropertiesMetricEnglishComments
Density 1.62 g/cc0.0585 lb/in³AMS-S83318
Volatiles 5.0 %5.0 %
Brookfield Viscosity 900000 - 1.30e+6 cP900000 - 1.30e+6 cPBase, RVF #6 sp @ 2 rpm
 
Mechanical PropertiesMetricEnglishComments
Hardness, Shore A 4040Hydrolytic Stability; AMS-S83318
 5555AMS-S83318
Tensile Strength at Break 2.76 MPa
@Time 1.21e+6 sec
400 psi
@Time 336 hour
Standard Cure; AMS-S83318
 1.38 MPa
@Treatment Temp. 60.0 °C,
Time 1.21e+6 sec
200 psi
@Treatment Temp. 140 °F,
Time 336 hour
JRF; AMS-S83318
 3.38 MPa
@Treatment Temp. 121 °C,
Time 605000 sec
490 psi
@Treatment Temp. 250 °F,
Time 168 hour
JRF; AMS-S83318
Elongation at Break 340 %
@Time 1.21e+6 sec
340 %
@Time 336 hour
Standard Cure; AMS-S83318
 280 %
@Treatment Temp. 121 °C,
Time 605000 sec
280 %
@Treatment Temp. 250 °F,
Time 168 hour
JRF; AMS-S83318
 380 %
@Treatment Temp. 60.0 °C,
Time 1.21e+6 sec
380 %
@Treatment Temp. 140 °F,
Time 336 hour
JRF; AMS-S83318
Peel Strength  9.12 kN/m
@Temperature 60.0 °C,
Time 605000 sec
52.0 pli
@Temperature 140 °F,
Time 168 hour
JRF, Alclad; AMS-S83318
 9.29 kN/m
@Temperature 60.0 °C,
Time 605000 sec
53.0 pli
@Temperature 140 °F,
Time 168 hour
JRF/SW, MIL-C-27725; AMS-S83318
 9.29 kN/m
@Temperature 60.0 °C,
Time 605000 sec
53.0 pli
@Temperature 140 °F,
Time 168 hour
JRF/SW, Alodine; AMS-S83318
 9.64 kN/m
@Temperature 60.0 °C,
Time 605000 sec
55.0 pli
@Temperature 140 °F,
Time 168 hour
JRF, MIL-C-27725; AMS-S83318
 9.64 kN/m
@Temperature 60.0 °C,
Time 605000 sec
55.0 pli
@Temperature 140 °F,
Time 168 hour
JRF/SW, Stainless Steel; AMS-S83318
 10.2 kN/m
@Temperature 60.0 °C,
Time 605000 sec
58.0 pli
@Temperature 140 °F,
Time 168 hour
JRF/SW, Alclad; AMS-S83318
 10.5 kN/m
@Temperature 60.0 °C,
Time 605000 sec
60.0 pli
@Temperature 140 °F,
Time 168 hour
JRF, Stainless Steel; AMS-S83318
 10.5 kN/m
@Temperature 60.0 °C,
Time 605000 sec
60.0 pli
@Temperature 140 °F,
Time 168 hour
JRF/SW, Titanium; AMS-S83318
 11.0 kN/m
@Temperature 60.0 °C,
Time 605000 sec
63.0 pli
@Temperature 140 °F,
Time 168 hour
JRF, Alodine; AMS-S83318
 11.4 kN/m
@Temperature 60.0 °C,
Time 605000 sec
65.0 pli
@Temperature 140 °F,
Time 168 hour
JRF, Titanium; AMS-S83318
 
Thermal PropertiesMetricEnglishComments
Maximum Service Temperature, Air 121 °C250 °FAMS-S83318
Minimum Service Temperature, Air -54.0 °C-65.2 °FAMS-S83318
 
Processing PropertiesMetricEnglishComments
Cure Time  480 min
@Temperature 25.0 °C
8.00 hour
@Temperature 77.0 °F
 600 min
@Temperature 4.40 °C
10.0 hour
@Temperature 39.9 °F
 840 min
@Temperature -6.70 °C
14.0 hour
@Temperature 19.9 °F
Tack-Free Time  60.0 min
@Temperature 25.0 °C
1.00 hour
@Temperature 77.0 °F
 120 min
@Temperature 4.40 °C
2.00 hour
@Temperature 39.9 °F
 300 min
@Temperature -6.70 °C
5.00 hour
@Temperature 19.9 °F
Shelf Life 6.00 Month
@Temperature <=26.7 °C
6.00 Month
@Temperature <=80.1 °F
 
Descriptive Properties
AppearanceDark BrownAccelerator
 Gray
 WhiteBase

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