PPG Aerospace® 870 A-2 Corrosion Inhibitive Sealant from SkyGeek is a corrosion-preventing sealant that works around the clock to block moisture and other corrosives from reaching the surface of your aircraft. The sealant has a service temperature range of -65ºF (-54ºC) to 250ºF (121ºC) and can withstand brief exposure to temperatures up to 275ºF (135ºC). The sealant forms a physical barrier against the common causes of corrosion and works best on aluminum alloys or between dissimilar metals. Once cured, the sealant maintains its elastomeric properties, which help it withstand the vibrational forces of flight.
PPG Aerospace® 870 A-2 Corrosion Inhibitive Sealant is strong and is formulated to withstand limited exposure to jet fuel and aviation gas. The two-part manganese dioxide-cured polysulfide compound is suitable for application by brush and can be applied in thicknesses up to 25 mils. It cures at room temperature and forms a resilient seal that bonds readily to most aircraft substrates when applied at room temperature. The sealant is sold in a pint-size kit and should be mixed just before use.
| Application Properties (typical) | | | Color | Part A - Black
Part B - White
Mixed - Gray | | Mixing ratio by weight | Part A: Part B
15:100 | | 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 30 A Durometer (hours) | | A-1/2 | 1/2 | <16 | 36 | | A-2 | 2 | <24 | 64 | | |
| Performance Properties (typical) | | | Cure Time | 14 days @ 77°F (25°C), 50% RH | | Cured specific gravity | 1.45 | | Nonvolatile content,(%) | 86% | | Ultimate cure hardness (Durometer A) | 50 | | Peel strength, pli (N/25 mm),100% cohesion | | JP-4 fluid immersion, 2 days @ 140°F (60°C) | 3% fuel/NaCl-H2O immersion, 2 days @ 140°F (60°C) | | MIL-A-8625 (Anodized aluminum) - 28 (125) | MIL-A-8625 (Anodized aluminum) - 30 (133) | | MIL-T-9046 (Titanium comp. C)* - 29 (129) | MIL-T-9046 (Titanium comp. C)* - 31 (138) | | *Primed with PR-148 Adhesion Promoter | | | Tensile strength, psi (KPa) | 250 (1724) - Standard cure,14 days @77°F(25°C), 50% RH | | Elongation, % | 250 - Standard cure,14 days @77°F(25°C), 50% RH | | Soluble chromate, % | 4 | | Low temperature flexibility @ -65°F (-54°C) | No cracking, checking or loss of adhesion. | | Resistance to hydrocarbons | Weight loss : 7.0% - 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. | | Salt spray (fog) test for 1000 hrs. (ASTM B117) | No corrosion to base substrate or deterioration of sealant. | | 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 870 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 P/S 870 Class A is at least 6 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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