PPG Aerospace® PR-1422 A-2 Fuel Tank Sealant from SkyGeek is the only sealant you need to make sure your critical fuel systems are safe and ready for flight. The leak-preventing sealant is designed for integral fuel tank sealing and has a wide service temperature range from -65°F (-54°C) to 250°F (121°C), with intermittent excursions up to 275°F (135°C). The gray sealant is designed for brush sealing of fasteners, ensuring even the smallest leaks won't stand a chance. Once applied, the sealant cures under room temperatures, maintaining its elastomeric properties after curing to better resist the vibrational forces of flight.
PPG Aerospace® PR-1422 A-2 Fuel Tank Sealant is made to be used in your aircraft's fuel tank, so it makes sense that it's resistant to aviation fuels. The two-part dichromate-cured polysulfide compound is brown for easy visual identification and it may be applied by brush in thicknesses up to 25 mils. Once cured, the sealant offers excellent adhesion to most common aircraft substrates, including metals, composites and more.
| Application Properties (typical) | | | Color | Part A - Black
Part B - Light Brown
Mixed - Brown | | Mixing ratio by weight | Part A: Part B
10:100 | | Base Viscosity | 250, (25)
(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) | | A-1/2 | 1/2 | <8 | 30 | | A-2 | 2 | <20 | 48 | | |
| Performance Properties (typical) | | | Cure Time | 14 days @ 77°F (25°C), 50% RH | | Cured specific gravity | 1.45 | | Nonvolatile content,(%) | 85% | | Ultimate cure hardness (Durometer A) | 53 | | 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) - 29 (129) | MIL-A-8625 (Anodized aluminum) - 35 (156) | | MIL-C-5541 (Alodine aluminum) - 31 (138) | MIL-C-5541 (Alodine aluminum) - 33 (147) | | MIL-C-27725 (IFT coating) - 30 (133) | MIL-C-27725 (IFT coating) - 35 (156) | | MIL-S-5059 (Stainless steel)* - 30 (133) | MIL-S-5059 (Stainless steel)* - 38 (169) | | MIL-T-9046 (Titanium comp. C)* - 31 (138) | MIL-T-9046 (Titanium comp. C)* - 35 (156) | | QQ-A-250/13 (Alclad) - 30 (133) | QQ-A-250/13 (Alclad) - 36 (160) | | *Primed with PR-148 Adhesion Promoter | | | Tensile strength, psi (KPa) | 350 (2413) - Standard cure,14 days @77°F(25°C), 50% RH | | Elongation, % | 250 - 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/JRF @ 140°F (60°C). | | Resistance to hydrocarbons, Weight loss, % | 4.0% - 7 days @ 140°F(60°C) immersed in 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. | | Flexibility | No cracks after bending 180 degrees over 0.125 inch (3.18 mm) mandrel. | | Resistance to other fluids | Excellent resistance to water, alcohols, petroleum-base and synthetic lubricating oils, and petroleum-base hydraulic fluids. | | 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
PR-1422 Class A 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 PR-1422 Class A is at least 9 months when stored at temperatures between 40°F (5°C) and 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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