PPG Aerospace® PR-1764 B-2 Conductive Sealant from SkyGeek delivers a strong seal and the ability to conduct electricity. The electrically conductive sealant is used in lighting mitigation systems to seal out moisture without interfering with the main function of the system. The sealant is black when cured and has a service temperature range of -67°F (-55°C) to 250°F (121°C), with intermittent excursions up to 360°F (182°C). Once cured, the material exhibits excellent long-term EMI-RMI protection. It also protects against corrosion, forming a physical barrier that blocks out moisture, jet fuel, aviation gas and other aviation chemicals.
PPG Aerospace® PR-1764 B-2 Conductive Sealant is a two-component sealant. The nickel-filled manganese dioxide-cured Permapol® P-3 polythioether compound has low sag and is a thixotropic paste that's easily applied by extrusion gun or spatula until the desired thickness is reached. The paste offers excellent adhesion to most surfaces and it cures readily at room temperature for ease of application and the ability to install in field settings.
| Application Properties (typical) | | | Color | Part A - Black
Part B - White
Mixed - Gray | | Mixing ratio by weight | Part A: Part B
15:100 | | Base Viscosity | (ASTM D217 cone), mm >100 | 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-2 | 2 | <10 | 48 | | | Acceleration | 10G | | Weight | 88 grams (without hardware)
110 gram maximum (9TC14) | | Overload Cycling | 100 operations at 200% rating | |
| Performance Properties (typical) | | | Cure Time | 3 days @ 77°F (25°C), 50% RH | | Cured specific gravity | Cured specific gravity | | Nonvolatile content, (%) | 94 | | Ultimate cure hardness (Durometer A) | 55 | | Tensile strength, psi (KPa) | 220 (1517) - Standard cure, 14 days @77°F(25°C), 50% RH | | Elongation, % | 70 - Standard cure, 14 days @77°F(25°C), 50% RH | | Electrical contact resistance, ohms | 0.04 - Standard cure, 14 days @77°F(25°C), 50% RH | | Volume/Bulk resistivity (Volume/Bulk resistivity) | 0.10 - Standard cure, 14 days @77°F(25°C), 50% RH | | EMI/RFI Shielding effectiveness, dB (Far field @ 1000 mHz, (ASTM ES 7-83)) | 70 - Standard cure, 3 days @77°F(25°C), 50% RH | | Corrosion resistance | No corrosion or significant change of conductivity after 2000 hours salt spray. | | Thermal stability | No blistering or cracking after 48 hours @ 250°F (121°C). Hardness retained within 15 Durometer A points. | | Low temperature brittleness @ -65°F (-54°C) | No cracking or fractures. | |
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-148 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.
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-1764 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-1764 Class B is at least 6 months when stored at temperatures below 80°F (27°C) in original unopened containers. Low temperature storage will optimize application properties.
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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