There’s sealant, and then there’s PPG® P/S 890 B-1/2 Fuel Tank Sealant from SkyGeek. This gray fuel tank sealant meets AMS-S-8802 Type 2 Class B-1/2 specifications, making it the kind of product that plays well with aviation professionals and high-spec maintenance crews. Designed to deliver a fuel-resistant bond, this sealant is formulated with fuselages in mind. The grey sealant is sold in a 2.5 oz 655-SemKit for easy applications, allowing you to get in deep and reach those tight spaces where leaks like to hide and fingers barely fit.
The SemKit format means no juggling measuring cups or mixing sticks. It’s pre-packed and pre-mixed, ready for action. You get about 30 minutes of working time before the curing begins, which is just enough time to finesse it into those stubborn joints or fuel tank seams. After six hours, it’s fully cured and completely resistant to the damaging effects of aviation fuel, hydraulic fluid and whatever else it might come up against in ground zero of your aircraft.
This isn’t some off-brand sealant pretending to be tough. It’s a high-performance polysulfide sealant designed for long-term flexibility and maximum chemical resistance. This trusted name-brand formula is relied on by pilots around the world. Whether you’re sealing a flange, closing a panel, or tackling routine fuel tank maintenance, it’s made to seal the deal — literally. The grey fuel tank sealant is sold in a 2.5-oz kit that brings big results in a small, very manageable tube. Think of it as the pocket-sized sealant superhero that’s here to stop leaks before they start.
| Application Properties (typical) | | | Color | Part A - Black
Part B - White
Mixed - Gray | | Mixing ratio by weight | Part A: Part B
10:100 | | Base Viscosity | 11,000, (1100)
(Brookfield #6 @ 10rpm), Poise (Pa-s) | Application life and cure time
@ 77°F (25°C), 50% RH | | | Application life (hours) | Tack free time (hours) | Cure time to 35 A Durometer (hours) | | B-1/2 | 1/2 | <10 | 24 | | B-2 | 2 | <20 | 48 | | B-4 | 4 | <36 | 90 | | |
| Performance Properties (typical) | | | Cure Time | 14 days @ 77°F (25°C), 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 immersion, 7 days @140°F (60°C) | JRF/NaCl-H2O immersion, 7 days @ 140°F (60°C) | | MIL-A-8625 (Anodized aluminum) - 41 (182) | MIL-A-8625 (Anodized aluminum) - 39 (173) | | MIL-C-5541 (Alodine aluminum) - 42 (187) | MIL-C-5541 (Alodine aluminum) - 40 (178) | | MIL-C-27725 (IFT coating) - 44 (196) | MIL-C-27725 (IFT coating) - 43 (191) | | MIL-S-5059 (Stainless steel)* - 44 (196) | MIL-S-5059 (Stainless steel)* - 42 (187) | | MIL-T-9046 (Titanium comp. C)* - 43 (191) | MIL-T-9046 (Titanium comp. C)* - 45 (200) | | QQ-A-250/13 (Alclad) - 39 (173) | QQ-A-250/13 (Alclad) - 42 (187) | | *Primed with PR-148 Adhesion Promoter | | | Tensile strength, psi (KPa) | 300 (2069) - Standard cure,14 days @77°F(25°C), 50% RH | | Elongation, % | 300 - Standard cure,14 days @77°F(25°C), 50% RH | | Thermal rupture resistance | Retains pressure of 10 psi with only negligible deformation, both before and after immersion in JRF. | | Low temperature flexibility @ -65°F (-54°C) | No cracking, checking or loss of adhesion. | | Resistance to hydrocarbons | Weight loss : 5.0% - 7 days @ 140°F(60°C) immersed in Type III fuel. | | Flexibility | No cracks after bending 180 degrees over 0.125 inch (3.18 mm) mandrel. | | Repairability to itself | Excellent to both freshly cured as well as fuel aged and abraded fillets. | | Corrosion resistance | No corrosion, adhesion loss, softening, or blistering after 20-day immersion in 2-layer salt water/JRF @ 140°F (60°C). | | Resistance to other fluids | Excellent resistance to water, alcohols, petroleum-base and synthetic lubricating oils. | | Fungus resistance | Non-nutrient | |
Note: The application and performance property values above are typical for the material, but not intended for use in specifications or for acceptance inspection criteria because of variations in testing methods, conditions and configurations.
Surface preparationImmediately before applying sealant to primed substrates, the surfaces should be cleaned with solvents. Contaminants such as dirt, grease, and/or processing lubricants must be removed prior to sealant application.
A progressive cleaning procedure should be employed using the appropriate solvents and new lint free cloth (reclaimed solvents or tissue paper should not be used). Always pour solvent on the cloth to avoid contaminating the solvent supply. Wash one small area at a time.
It is important that the surface is dried with a second clean cloth prior to the solvent evaporating to prevent the redeposition of contaminants on the substrate.
Substrate composition can vary greatly. This can affect sealant adhesion. It is recommended that adhesion characteristics to a specific substrate be determined prior to application on production parts or assemblies.
For a more thorough discussion of proper surface preparation, please consult the SAE Aerospace Information Report AIR 4069. This document is available through SAE, 400 Commonwealth Avenue, Warrendale, PA 15096-0001.
Mixing instructions
P/S 890 Class B is supplied in a two-part kit. Mix according to the ratios indicated in the application properties section. Mix Part A and Part B separately to uniformity, then thoroughly mix entire contents of both parts of the kit together taking care to avoid leaving unmixed areas around the sides or bottom of the mixing container.
Storage life
The storage life of P/S 890 Class B is at least 9 months when stored at temperatures below 80°F (27°C) in original unopened containers.
Health precautions
This product is safe to use and apply when recommended precautions are followed. Before using this product, read and understand the Material Safety Data Sheet (MSDS), which provides information on health, physical and environmental hazards, handling precautions and first aid recommendations. An MSDS is available on request. Avoid overexposure. Obtain medical care in case of extreme overexposure.
For industrial use only. Keep away from children.
For emergency medical information call 1-800-228-5635.
Safety Data Sheet
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