3M AC-275 Class B-1/2 Aerospace Sealant

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3M AC-275 Class B-1/2 Aerospace Sealant
Categories:	Polymer; Thermoset; Polysulfide Sealant/Adhesive
Material Notes:	3M Aerospace Sealant AC-275 Class B is a high temperature two-component manganese dioxide cured, liquid polysulfide polymer sealants providing excellent fuel tank and fuselage seals. They have outstanding resistance to aviation gasoline and jet fuel, as well as resistance to chemicals and petroleum products common o the aircraft industry. 3M AC-275 Class B Sealants maintain flexibility and bond strength on most metal substrates like aluminum, 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	Metric	English	Comments

Density	1.64 g/cc	0.0592 lb/in³	cured 14 days @ 50% RH; AMS3276
Volatiles	3.0 %	3.0 %
Brookfield Viscosity	70000 - 160000 cP	70000 - 160000 cP	Accelerator, RVF #10 sp @ 2 rpm
	1.00e+6 - 1.60e+6 cP	1.00e+6 - 1.60e+6 cP	Base, RVF #7 sp @ 2 rpm

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	60	60	cured 14 days @ 50% RH; AMS3276
Tensile Strength at Break	1.48 MPa	215 psi	JRF-12 days @ 60°C + 60 hrs @ 71°C + 6 hrs 82°C; AMS3276
	1.65 MPa	239 psi	Std Heat Cycle; AMS3276
	2.41 MPa	350 psi	Standard Cure - 14 days; AMS3276
	2.48 MPa	360 psi	JRF-12 days @ 60°C + 60 hrs @ 71°C + 6 hrs 82°C + 24 hrs @ 49°C + Std Heat Cycle; AMS3276
Elongation at Break	100 %	100 %	Std Heat Cycle; AMS3276
	155 %	155 %	JRF-12 days @ 60°C + 60 hrs @ 71°C + 6 hrs 82°C + 24 hrs @ 49°C + Std Heat Cycle; AMS3276
	210 %	210 %	JRF-12 days @ 60°C + 60 hrs @ 71°C + 6 hrs 82°C; AMS3276
	220 %	220 %	Standard Cure - 14 days; AMS3276

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	1440 min	24.0 hour
Tack-Free Time	480 min	8.00 hour
Shelf Life	9.00 Month @Temperature <=26.7 °C	9.00 Month @Temperature <=80.1 °F

Descriptive Properties
Appearance	Black		Accelerator
	Gray
	White		Base

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

PMM35378 / 170125

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