PPG PR1440A-1/2 (1-ea-S654)

PR-1440 Class A Fuel Tank Sealant

Overview

PPG Aerospace PRC-DeSoto PR-1440 Class A is a two-part, manganese dioxide cured polysulfide aircraft fuel tank sealant designed for brush application on integral fuel tanks, fasteners, and aircraft fuselage sealing applications. The cured sealant provides excellent elastomeric performance, adhesion, and resistance to aviation fuels, hydraulic fluids, and environmental exposure.

Key Technical Specs

• Product Type: Two-part polysulfide fuel tank sealant
• Class: Class A (brushable application grade)
• Cure System: Manganese dioxide cured polysulfide
• Service Temperature Range: -65°F (-54°C) to 250°F (121°C)
• Intermittent Temperature Capability: Up to 275°F (135°C)
• Colour:
  • Part A: Black
  • Part B: Off-white
  • Mixed: Dark grey
• Mix Ratio: 10:100 (Part B : Part A by weight)
• Application Thickness: Up to 25 mils

Approvals & Specifications

• Tested in accordance with AMS-S-8802 Class A requirements
• Compatible with common aerospace substrate specifications
• Used in aircraft integral fuel tank sealing applications

Typical Applications

• Aircraft integral fuel tank sealing
• Brush sealing of fasteners and fittings
• Fuel cell and fuselage sealing
• Aircraft structural sealing applications
• Maintenance, repair, and overhaul (MRO) sealing operations

Application Properties

• Base viscosity: Approx. 300 Poise
• Application life at 25°C / 50% RH: Approx. 30 minutes
• Tack free time: Less than 10 hours
• Cure time: Approximately 72 hours
• Full cure: 14 days at 25°C / 50% RH

Performance Properties

• Cured Specific Gravity: Approx. 1.57
• Ultimate Hardness: 48 Shore A
• Tensile Strength: Approx. 325 psi
• Elongation: Approx. 225%
• Excellent fuel resistance after immersion testing
• Excellent flexibility at low temperatures
• Excellent resistance to corrosion and environmental exposure

Chemical & Environmental Resistance

• Excellent resistance to jet fuel and aviation gasoline
• Resistant to water and alcohols
• Resistant to petroleum-based and synthetic lubricating oils
• Resistant to petroleum hydraulic fluids
• Non-nutrient fungus resistance

Compatibility & Safety Notes

• Provides excellent adhesion to aluminium, stainless steel, titanium, and aircraft coatings
• Surfaces must be properly prepared before application
• Follow approved aerospace processing procedures
• Refer to manufacturer Safety Data Sheet before use

Why This Product is Chosen for AOG / MRO

• Provides reliable long-term fuel tank sealing performance
• Maintains flexibility under aircraft operating conditions
• Excellent resistance to aviation fuels and fluids
• Repairable after cure and compatible with fuel-aged surfaces

Practical Suggestions for Your Team (AOG Mindset)

• Ensure accurate mixing ratio before application
• Apply within the available working life after mixing
• Allow sufficient cure time before fuel exposure
• Verify substrate preparation and approved primers where required

Manufacturer / Aviation Spec Codes

• Product Name: PR-1440 Class A Fuel Tank Sealant
• Manufacturer: PPG Aerospace / PRC-DeSoto
• Specification: AMS-S-8802 Class A
• Type: Aircraft integral fuel tank polysulfide sealant