3M AC-275 Class B-4 Aerospace Sealant

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3M AC-275 Class B-4 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	Original Value	Comments

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

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

Thermal Properties	Original Value	Comments
Maximum Service Temperature, Air	121 °C	cured 14 days @ 50% RH
	182 °C	Short term, cured 14 days @ 50% RH
Minimum Service Temperature, Air	-54.0 °C	cured 14 days @ 50% RH

Processing Properties	Original Value	Comments
Cure Time	120 hour
Tack-Free Time	42.0 hour
Shelf Life	9.00 Month @Temperature <=26.7 °C

Descriptive Properties
Appearance	Black	Accelerator
	Gray
	White	Base

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PMM35380 / 170127

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