PPG PR1425CFB-2 (100-ml-Semkit) WINDSHIELD SEALANT (100-ml-Semkit)

Additional Product Information

Overview

PPG PR1425CFB-2 is a fast-curing, two-part polysulfide sealant specifically formulated for sealing aircraft windshields, canopies, and transparencies. Trusted by aircraft engineers and MRO teams worldwide, it delivers long-lasting performance without the risk of crazing or surface damage to sensitive transparent substrates. From advanced military aircraft to high-utilisation commercial fleets, PR1425CFB-2 is relied upon to maintain cockpit integrity and flight safety under extreme environmental and operational conditions. Its convenient 100 ml Semkit packaging supports precise application during scheduled maintenance and urgent AOG situations, ensuring aircraft remain operational and airworthy with minimal downtime.

Key Technical Specs

• Type / Use: Two-part, manganese dioxide-cured polysulfide sealant (Class B), designed for aircraft transparencies
• Service Temperature Range: -65°F to +250°F (-54°C to +121°C), intermittent exposure up to 275°F (135°C)
• Substrate Compatibility: Glass, polycarbonate, acrylic, and properly prepared metals
• Crazing Resistance: Specifically engineered to prevent crazing of transparent materials
• Application Life (B-2 Class): Approximately 2 hours at 25°C (77°F)
• Tack-Free Time: Less than 8 hours
• Full Cure: Approximately 12 hours at 25°C (77°F)
• Colour: Black (mixed)
• Form: Thixotropic, low-sag paste suitable for vertical applications
• Shelf Life: Approximately 9 months when stored unopened between 5°C and 27°C (40°F to 80°F)

Mechanical Properties (Cured)

• Durometer (Shore A): Approx. 47
• Tensile Strength: Approx. 430 psi (2.69 MPa)
• Elongation: Approx. 235°
• Peel Strength (14 days): ~47 pli on glass, ~65 pli on acrylic, ~56 pli on aluminium

Typical Aircraft MRO / AOG Applications

• Sealing aircraft windshields, canopies, and cockpit transparencies
• Rapid AOG repairs requiring controlled cure and fast return to service
• Scheduled transparency replacement during heavy maintenance checks
• Military and commercial aircraft cockpit sealing applications

Compatibility & Safety Notes

• Priming typically required using PR-1861 adhesion promoter
• Transparent surfaces should be polished; plastics lightly abraded before application
• Clean all surfaces with approved solvents prior to sealing
• Classified as hazardous; consult SDS and use appropriate PPE
• Apply in well-ventilated areas to avoid overexposure

Packaging & Procurement

• Supplied in 100 ml Semkit cartridges for precise, pre-measured application
• Shelf life of 9 months from manufacture under correct storage conditions
• UN Classification: UN 3077, Class 9, Packing Group III
• Recommended storage in climate-controlled, secure MRO facilities

Why PPG PR1425CFB-2 is Chosen for AOG / MRO

• Fast curing reduces aircraft downtime in AOG situations
• Excellent adhesion to aircraft transparency materials
• Proven resistance to UV exposure, weathering, and temperature extremes
• Pre-measured Semkit format minimizes waste and application errors
• Widely approved and trusted across commercial and military aviation

Practical Suggestions for Your Team (AOG Mindset)

• Stock Semkits in AOG tool cribs and high-traffic maintenance zones
• Monitor inventory closely due to limited shelf life
• Ensure ground crews are trained on correct mixing and application procedures
• Prepare and mask transparency surfaces in advance during AOG events
• Include PR1425CFB-2 in dedicated emergency repair kits
• Maintain repair logs for traceability and regulatory compliance

Manufacturer / Aviation Spec Codes

• Boeing Specification: PR1425B2CF
• Military Specification: MIL-PRF-81733
• National Stock Number (NSN): 8030-99-7514921

Alternative Names & Descriptions

• PPG Polysulfide Sealant PR1425CFB-2
• PPG PR1425 CFB-2
• PR-1425B2 Polysulfide Sealant
• PPG Windshield and Canopy Sealant
• 100 ml Aerospace Polysulfide Semkit
• NSN 8030-99-7514921