PPG Aerospace® PR-1750 A-2 Fuel Tank Sealant from SkyGeek is a smooth, resilient sealant that is designed for brush-sealing fasteners in your aircraft’s fuel tank. The sealant helps secure weak spots where fasteners pass through the walls of the fuel tank, leaving small gaps for leaks to occur. When used as directed, PPG Aerospace® PR-1750 A-2 Fuel Tank Sealant is resistant to aviation gas and jet fuel, delivering a reliable hold in challenging conditions. PPG Aerospace® PR-1750 A-2 Fuel Tank Sealant has a wide service temperature range from -65°F (-54°C) to 250°F (121°C), with intermittent excursions up to 360°F (182°C), so it's flexible enough to handle even the most challenging installations.
PPG Aerospace® PR-1750 A-2 Fuel Tank Sealant is gray and is sold in a 6-ounce, 654-SemKit for easy application. The two-part manganese dioxide-cured polysulfide compound goes on smoothly with a brush and can be applied in thicknesses up to 25 mils. The sealant cures at room temperature and offers excellent adhesion to common aircraft substrates, including those used in fuel systems.
| Application Properties (typical) | | | Color | Part A - Black
Part B - Beige
Mixed - Dark Gray | | Mixing ratio by weight | Part A: Part B
10:100 | | Base Viscosity | 300, (30)
(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 | <10 | 24 | | A-2 | 2 | <24 | 48 | | |
| Performance Properties (typical) | | | Cure Time | 14 days @ 77°F (25°C), 50% RH | | Cured specific gravity | 1.57 | | Nonvolatile content,(%) | 86% | | Ultimate cure hardness (Durometer A) | 50 | | 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) - 35 (156) | AMS 2471 (Anodized aluminum) - 37 (165) | | AMS 4901 (Titanium)* - 37 (165) | AMS 4901 (Titanium)* - 34 (151) | | AMS 5516 (Stainless steel)* - 34 (151) | AMS 5516 (Stainless steel)* - 34 (151) | | MIL-C-5541 (Alodine aluminum) - 35 (156) | MIL-C-5541 (Alodine aluminum) - 34 (151) | | MIL-C-27725 (IFT coating) - 36 (160) | MIL-C-27725 (IFT coating) - 35 (156) | | *Primed with PR-148 Adhesion Promoter | | | 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 : 5.0% - 7 days @ 140°F(60°C) immersed in AMS 2629 JRF.
Swell : 10.1% - 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 | | Paintability | No separation from sealant | |
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-1750 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 to-gether taking care to avoid leaving unmixed areas around the sides or bottom of the mixing container.
Storage life
The storage life of PR-1750 Class A 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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