PPG PR1995B-2 (1-USpt-Kit)

PR-1995 Class B Fuel Tank Sealant

Overview

PR-1995 Class B is a two-part, brushless firewall and fuel tank sealant based on silicone polymer technology. Designed for aerospace applications, it seals firewall structures against the passage of air and vapours while maintaining excellent performance under prolonged exposure to phosphate ester-based hydraulic fluids. The sealant provides high-temperature resistance, making it suitable for demanding aircraft manufacturing, maintenance, repair, and overhaul (MRO) environments.

Key Technical Specs

• Product Type: Two-part silicone polymer firewall / fuel tank sealant
• Class: Class B
• Colour: Grey (Part A, Part B and mixed)
• Mix Ratio (by weight): 10:100 (Part A : Part B)
• Specific Gravity: 1.62
• Non-Volatile Content: 98%
• Application Life: Approximately 2 hours
• Viscosity: 7,000 Poise (700 Pa�s)
• Service Temperature Range: -54°C to 204°C (-65°F to 400°F)
• Flash Temperature Resistance: Up to 1927°C (3500°F)
• Typical Cure Hardness (Shore A): 35 after 24 hours; 50 after 7 days

Approvals & Specifications

• Manufactured by PPG / PRC-DeSoto for aerospace sealing applications
• Performance testing conducted in accordance with PRC-DeSoto International specification test methods unless otherwise noted
• Available in preformed parts using PPG's ARE™ (Ambient Reactive Extrusion) additive manufacturing technology

Typical Applications

• Aircraft firewall sealing
• Fuel tank sealing
• Sealing structures against air and vapour leakage
• Aerospace structures exposed to phosphate ester hydraulic fluids
• OEM production and aircraft maintenance (MRO)

Compatibility & Safety Notes

• Clean primed substrates thoroughly before application using appropriate solvents
• Remove dirt, grease and processing lubricants before sealing
• Allow cleaned surfaces to dry completely before application
• Evaluate adhesion on specific substrates prior to production use
• Consult the Safety Data Sheet (SDS) before handling
• For industrial use only

Packaging & Procurement

• Supplied as a two-part can kit or Semkit® package
• Also available as preformed parts using PPG ARE™ technology
• Storage Life: Minimum 6 months when stored below 27°C (80°F) in original unopened containers

Why This Product is Chosen for AOG / MRO

• Maintains sealing performance after prolonged exposure to phosphate ester hydraulic fluids
• Excellent resistance to extreme service and flash temperatures
• Provides durable air and vapour sealing for critical aircraft structures
• Available in multiple packaging formats for maintenance and production requirements

Practical Suggestions for Your Team (AOG Mindset)

• Prepare substrates carefully to maximise adhesion and long-term sealing performance
• Mix components accurately using the specified weight ratio
• Plan work within the approximately 2-hour application life
• Store unopened material below 27°C to maintain shelf life
• Verify cure before returning components to service where applicable

Manufacturer / Aviation Spec Codes

• Product Name: PR-1995 Class B
• Manufacturer: PPG / PRC-DeSoto International
• Product Type: Silicone polymer firewall and fuel tank sealant
• Application: Aerospace firewall and fuel tank sealing