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Old 12-12-2017, 02:26 PM
Larco Larco is offline
 
Join Date: Mar 2005
Location: DVT Phoenix
Posts: 1,070
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P/S 890 Class B is an aircraft integral fuel tank sealant. It has a service temperature range from - 65F (-54C) to 250F (121C), with intermittent excursions up to 275F (135C). This material is designed for fillet sealing of fuel tanks and other air- craft fuselage sealing applications. The cured sealant maintains excellent elastomeric properties after pro- longed exposure to both jet fuel and aviation gas.
P/S 890 Class B is a two-part, manganese dioxide cured polysulfide compound. The uncured material is a low sag, thixotropic paste suitable for application by extrusion gun or spatula. It cures at room tempera- ture to form a resilient sealant having excellent adhe- sion to common aircraft substrates.
The following tests are in accordance with AMS-S- 8802 Class B specification test methods.
Application Properties
Performance Properties (Typical)
Cured 14 days @ 77F (25C), 50% RH
Cured specific gravity 1.55
Nonvolatile content, % 95
Ultimate cure hardness,
Durometer A 49
Peel strength, pli (N/25 mm), 100% cohesion JRF(AMS 2629) immersion, 7 days @ 140F (60C)
(Typical)
Color Part A
Part B Mixed
Mixing ratio By weight
Base viscosity
(Brookfield #7 @ 2 rpm), Poise (Pa-s)
Black White Gray
Part A: Part B 10:100 or 1 to ten
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