3M AC-250 B-1/6 Aerospace Sealant

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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 Properties	Original Value	Comments

Density	1.62 g/cc	AMS-S83318
Volatiles	5.0 %
Brookfield Viscosity	900000 - 1.30e+6 cP	Base, RVF #6 sp @ 2 rpm

Mechanical Properties	Original Value	Comments
Hardness, Shore A	40	Hydrolytic Stability; AMS-S83318
	55	AMS-S83318
Tensile Strength at Break	2.76 MPa @Time 1.21e+6 sec	Standard Cure; AMS-S83318
	1.38 MPa @Treatment Temp. 60.0 °C, Time 1.21e+6 sec	JRF; AMS-S83318
	3.38 MPa @Treatment Temp. 121 °C, Time 605000 sec	JRF; AMS-S83318
Elongation at Break	340 % @Time 1.21e+6 sec	Standard Cure; AMS-S83318
	280 % @Treatment Temp. 121 °C, Time 605000 sec	JRF; AMS-S83318
	380 % @Treatment Temp. 60.0 °C, Time 1.21e+6 sec	JRF; AMS-S83318
Peel Strength	52.0 pli @Temperature 60.0 °C, Time 605000 sec	JRF, Alclad; AMS-S83318
	53.0 pli @Temperature 60.0 °C, Time 605000 sec	JRF/SW, MIL-C-27725; AMS-S83318
	53.0 pli @Temperature 60.0 °C, Time 605000 sec	JRF/SW, Alodine; AMS-S83318
	55.0 pli @Temperature 60.0 °C, Time 605000 sec	JRF, MIL-C-27725; AMS-S83318
	55.0 pli @Temperature 60.0 °C, Time 605000 sec	JRF/SW, Stainless Steel; AMS-S83318
	58.0 pli @Temperature 60.0 °C, Time 605000 sec	JRF/SW, Alclad; AMS-S83318
	60.0 pli @Temperature 60.0 °C, Time 605000 sec	JRF, Stainless Steel; AMS-S83318
	60.0 pli @Temperature 60.0 °C, Time 605000 sec	JRF/SW, Titanium; AMS-S83318
	63.0 pli @Temperature 60.0 °C, Time 605000 sec	JRF, Alodine; AMS-S83318
	65.0 pli @Temperature 60.0 °C, Time 605000 sec	JRF, Titanium; AMS-S83318

Thermal Properties	Original Value	Comments
Maximum Service Temperature, Air	121 °C	AMS-S83318
Minimum Service Temperature, Air	-54.0 °C	AMS-S83318

Processing Properties	Original Value	Comments
Cure Time	8.00 hour @Temperature 25.0 °C
	10.0 hour @Temperature 4.40 °C
	14.0 hour @Temperature -6.70 °C
Tack-Free Time	1.00 hour @Temperature 25.0 °C
	2.00 hour @Temperature 4.40 °C
	5.00 hour @Temperature -6.70 °C
Shelf Life	6.00 Month @Temperature <=26.7 °C

Descriptive Properties
Appearance	Dark Brown	Accelerator
	Gray
	White	Base

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