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-   -   Tank sealant ratio needed (http://www.vansairforce.com/community/showthread.php?t=156029)

Jeff Vaughan 12-12-2017 02:10 PM

Tank sealant ratio needed
 
I need to mix up a very small amount of PPG B2
My container does not have the ratio of part A to Part B
Anyone out there know what it is?

Larco 12-12-2017 02:26 PM

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

Rick_A 12-12-2017 03:17 PM

By weight
 
Don't overlook that the 10-to-1 is by weight.

Use a digital postal scale set to grams

Jeff Vaughan 12-12-2017 04:23 PM

Thanks guys

rzbill 12-13-2017 05:24 AM

Quote:

Originally Posted by Rick_A (Post 1225209)
Don't overlook that the 10-to-1 is by weight.

Use a digital postal scale set to grams

Or an 11 unit long balance beam with the pivot at unit 1.


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