If you consider the windshield a critical component (and you should), you need PPG Aerospace® PR-1425 B-1/2 Windshield and Canopy Sealant from SkyGeek. The sealant has a service temperature range from -65°F to (-52°C) to 250°F (121°C) and can even withstand intermittent excursions up to 275°F (135°C). The thick sealant is designed for fillet sealing of glass, polycarbonate and acrylic windshields and is specifically formulated not to craze substrates, keeping your windshield crystal clear. Once cured, PPG Aerospace® PR-1425 B-1/2 Windshield Caulking offers excellent UV resistance and can withstand all types of weather conditions.
PPG Aerospace® PR-1425 B-1/2 Windshield and Canopy Sealant is a two-part formula that must be mixed just before use. The dichromate-cured polysulfide compound has low sag and is a thixotropic paste after mixing. Apply the black windshield sealer via an extrusion gun or spatula and enjoy excellent adhesion to the most common types of aircraft substrates. The sealant is sold in a two-chamber 6-ounce 654-SemKit.
| Application Properties (typical) | | | Color | Part A - Black
Part B - Black
Mixed - Black | | Mixing ratio by weight | Part A: Part B
10:100 | | Base Viscosity | 16,000, (1600)
(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) | | B-1/2 | 1/2 | <8 | 24 | | B-1 | 1 | <24 | 48 | | B-2 | 2 | <24 | 48 | | |
| Performance Properties (typical) | | | Cure Time | 7 days @ 77°F (25°C), 50% RH | | Cured specific gravity | 1.49 | | Nonvolatile content,(%) | 93% | | Ultimate cure hardness (Durometer A) | 55 | | Peel strength, pli (N/25 mm),100% cohesion | | Dry, 14 days @ 77°F (25°C) | | MIL-G-25667 (Glass) - 50 (222) | | MIL-P-8184 (Acrylic)* - 48 (214) | | MIL-P-83310 (Polycarbonate)* - 46 (205) | | MIL-S-5059 (Stainless steel)* - 46 (205) | | MIL-T-9046 (Titanium comp. C)* - 46 (205) | | QQ-A-250/12 (Aluminum) - 46 (205) | | *Primed with PR-142 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 fluids | Excellent resistance to water, alcohols, petroleum-base and synthetic lubricating oils, and petroleum-base hydraulic fluids. | | 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. | | 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-1425 Class B 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-1425 Class B 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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