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P/S 890 Class A is an aircraft integral fuel tank sealant. It has a service temperature range from -65┬░F (-54┬░C) to 250┬░F (121┬░C), with intermittent excursions up to 275┬░F (135┬░C).
This material is designed for brush and fay sealing of fuel tanks and other aircraft fuselge sealing applications. The cured sealant maintains excellent elastomeric properties after prolonged exposure to both jet fuel and aviation gas.
P/S 890 Class A is a two-part, manganese dioxide cured polysulfide compound. The uncured material is suitable for applicaiton by brush in thickness up to 25 mils. It cures at room temperature to form a resilient sealant having excellent adhesion to common aircraft substrates.
Specifications
AMS-S-8802 - Type 2 Class A-1/2
AMS-S-8802 - Type 2 Class A-2
BMS 5-45 - Class A-2 Grade 1 - BOEING
CMNP021 - Type I, Class A-2 - CESSNA AIRCRAFT COMPANY
MM1077 - Class A-1/2, Type 2 - MITSUBISHI HEAVY INDUSTRIES
MM1077 - Class A-2, Type 2 - MITSUBISHI HEAVY INDUSTRIES
The Frekote 770-NC synthetic mold release I ordered has a 6-month shelf life from the factory. The can I received on 8/25 was set to expire on 8/31 according to the date printed on the bottom of the can. I called and sent a photo of the can bottom and they said it should have been taken off the shelf a month earlier, so they will send me a good can when new stock arrives without sending the out of date can back.
I appreciate the fast delivery and them taking care of the issue, but it means you could be buying product that has only one month of shelf life remaining. Call before you buy and have them confirm the expiration date of their stock and if it is less than works for you, work out delivery from fresh stock or negotiate a discount.
