PPG Aerospace® PR-1826 B-1/2 Fuel Tank Sealant from SkyGeek is an integral fuel tank sealant, with a special formula that better resists aviation fuels and gasoline. The sealant has a service temperature range of -80°F (-62°C) to 320°F (160°C), but can handle intermittent exposure to temperatures as high as 420°F (216°C). The sealant is designed for use on the inside of the fuel tank, and easily fills cracks and gaps as well as sealing fasteners. The sealant has a standard gray color, so it blends in with the fuel tank once cured, offering nearly invisible protection.
PPG Aerospace® PR-1826 B-1/2 Fuel Tank Sealant from SkyGeek is designed for fillet sealing and once cured it maintains its excellent elastomeric properties. The sealant is not altered, weakened or diminished with exposure to jet fuel or aviation gas. The sealant is sold as a two-part epoxy-cured Permapol® P-3 polythioether compound in a 2.5-ounce SemKit. The unique design of the SemKit ensures the right ratios are dispensed and once mixed, the sealant forms a low-sag thixotropic paste that is easily applied by extrusion gun or spatula. PPG Aerospace® PR-1826 B-1/2 Sealant may be used on most types of aircraft substrates.
| Application Properties (typical) | | | Color | Part A - Black
Part B - White
Mixed - Dark Gray | | Mixing ratio by weight | Part A: Part B
8.5:100 | | Base Viscosity | 15,000, (1500)
(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 30 A Durometer (hours) | | B-1/2 | 1/2 | <2 | 3 | | B-2 | 2 | <12 | 16 | | |
| Performance Properties (typical) | | | Cure Time | 7 days @ 77°F (25°C), 50% RH | | Cured specific gravity | 1.47 | | Nonvolatile content,(%) | 96% | | Ultimate cure hardness (Durometer A) | 47 | | Peel strength, pli (N/25 mm),100% cohesion | | AMS 2629 JRF immersion, 7 days @ 140°F (60°C) | AMS 2629 JRF/NaCl-H2O immersion, 7 days @ 140°F (60°C) | | AMS 2471 (Anodized aluminum)* - 39 (173) | AMS 2471 (Anodized aluminum)* - 45 (200) | | AMS 4901 (Titanium)* - 37 (165) | AMS 4901 (Titanium)* - 34 (151) | | AMS 5516 (Stainless steel)* - 34 (151) | AMS 5516 (Stainless steel)* - 40 (178) | | MIL-C-5541 (Alodine aluminum)* - 43 (191) | MIL-C-5541 (Alodine aluminum)* - 50 (222) | | MIL-C-27725 (IFT coating)* - 38 (169) | MIL-C-27725 (IFT coating)* - 46 (205) | | *Primed with PR-1826 Adhesion Promoter | | | Tensile strength, psi (KPa) | 350 (2413) - Standard cure,14 days @77°F(25°C), 50% RH | | Elongation, % | 350 - 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. | | Corrosion resistance | No corrosion, adhesion loss, softening, or blistering after 20-day immersion in 2-layer salt water/AMS 2629 JRF after 12 days @ 140°F (60°C) | | Resistance to hydrocarbons | Weight loss : 2.5% - 7 days @ 140°F(60°C) immersed in AMS 2629 JRF. | | 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. | | Resistance to other fluids | Excellent resistance to water, alcohols, petroleum-base and synthetic lubricating oils, and petroleum-base hydraulic fluids. | | Fungus resistance | Non-nutrient | | Shaving and sanding | No rolling or tearing | |
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.
After the surface has been cleaned, apply PR-1826 Adhesion Promoter with a clean brush or a gauze pad. Care must be taken to obtain a uniform thin coat. At standard temperature, allow the adhesion promoter to dry 30 minutes. It is not recommended to apply adhesion promoter below 45°F (7°C). The sealant must be applied within 8 hours of the application of the adhesion promoter. If this time is exceeded, the surface should be recleaned and the adhesion promoter reapplied. Do not use adhesion promoter if it contains particles or precipitate.
Mixing instructions
PPR-1826 Class B is supplied in a Semkit® package. See the container for specific mixing instructions. The mix ratio is very critical.
Storage life
The storage life of PR-1826 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.
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