PPG Aerospace - PRC-Desoto PR-1750 Class B - 1/2 hour application life - Fuel Tank Sealant - Pint
PR-1750 Class B is an aircraft integral fuel tank sealant. It has a service temperature range from -65°F (-54°C) to 250°F (121°C), with intermittent excursions up to 360°F (182°C). This material is designed for fillet sealing of fuel tanks and other aircraft fuselage sealing applications. The cured sealant maintains excellent elastomeric properties after prolonged exposure to both jet fuel and aviation gas.
PR-1750 Class B is a two part, manganese dioxide cured polysulfide compound. The uncured material is a low sag, thixotropic paste suitable for application by extrusion gun or spatula. It cures at room temperature to form a resilient sealant having excellent adhesion to common aircraft substrates. Tested in accordance with AMS 3276 Class B specifications.
| 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 | 12,000, (1200)
(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 | <10 | 24 | | B-2 | 2 | <24 | 48 | | |
| Performance Properties (typical) | | | Cure Time | 14 days @ 77°F (25°C), 50% RH | | Cured specific gravity | 1.58 | | Nonvolatile content,(%) | 97% | | 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) - 34 (151) | AMS 2471 (Anodized aluminum) - 39 (173) | | AMS 4901 (Titanium)* - 35 (156) | AMS 4901 (Titanium)* - 41 (182) | | AMS 5516 (Stainless steel)* - 34 (151) | AMS 5516 (Stainless steel)* - 39 (173) | | MIL-C-5541 (Alodine aluminum) - 34 (151) | MIL-C-5541 (Alodine aluminum) - 39 (173) | | MIL-C-27725 (IFT coating) - 35 (156) | MIL-C-27725 (IFT coating) - 37 (164) | | *Primed with PR-148 Adhesion Promoter | | | Tensile strength, psi (KPa) | 420 (2896) - 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 AMS 2629 JRF.
Swell : 8.9% - 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 | |
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 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-1750 Class B 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.
Safety Data Sheet
INTERNATIONAL SHIPPING
HAZMAT ORDERS
Country of Origin