DeSoto® P/S 890 Class B is a two-part manganese dioxide-cured polysulfide sealant for fillet sealing aircraft fuel tanks and fuselage. It maintains elastomeric properties after prolonged exposure to jet fuel and aviation gas across -65°F to 250°F.
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Boeing Distribution (formerly Aviall)
This product has been replaced by new Part # PS890B1-2-2-5=5N
This high-performance two-part polysulfide sealant comes in a 2.5 oz package. The low-sag, thixotropic paste cures at room temperature to a resilient seal with strong adhesion to aluminum, titanium, steel, and magnesium. It has a 30-minute application life and is intended for industrial use in fuel-exposed areas.
Features & Benefits
Resilient seal maintains elastomeric properties after fuel exposure
Thixotropic paste ideal for vertical or overhead applications without sagging
Strong adhesion to multiple substrates including aluminum and titanium
Room temperature cure forms durable seal efficiently
Meets stringent OEM specifications from Boeing, Cessna, and Lockheed
Provides robust corrosion resistance and long-term performance
Specifications
Series: P/S 890
Manufacturer: PRC-DeSoto (PPG Aerospace)
Container Size: 2.5 oz
Form: Liquid (Part A), Solid (Part B) (Mixed as a paste)
Color: Black/White (Parts A/B), Gray (Mixed)
Application Time: 30 minutes (Class B-1/2)
Tack-Free Time: <4 hours
Curing Time: 30 hours (to handling strength)
Temperature Rating: -65 to 250°F
Specific Gravity: 1.55 (Mixed)
Shelf Life: 274 Days
Technical Information
AMS-S-8802 Type 2 Class B-2 Approved (Title specifies B-1/2)
Boeing BMS 5-44 Class B-2 Approved
Cessna CMNP021 Type I Class B-2 Approved
De Havilland DHMS S307 Class B-2 Approved
Lockheed FMS-1049 FORM II and III Class B-1 Approved
DISCLAIMER: Product information provided “as is.” Boeing may add, change, discontinue or remove this information at any time. Product photos may not be exact match to product delivered. Seeterms & conditions.
