PPG PR1425CFB-1/2 (100-ml-Semkit)

PR-1425CF Class B Windshield and Canopy Sealant

Overview

PR-1425CF Class B is a fast-curing, chrome-free, two-component polysulfide sealant developed by PPG Aerospace for aircraft windshield, canopy and transparency sealing applications. Formulated with a manganese dioxide curing system, it provides outstanding adhesion to properly prepared glass, acrylic and polycarbonate without causing crazing. The cured sealant delivers excellent UV, weather and rain erosion resistance while maintaining flexibility over a wide operating temperature range, making it ideal for both OEM production and aircraft MRO operations.

Key Technical Specs

• Product Type: Two-component manganese dioxide-cured polysulfide sealant
• Class: Class B
• Chrome-Free: Yes
• Colour: Black
• Mix Ratio (by Weight): 20 Parts A : 100 Parts B
• Application Method: Extrusion gun or spatula
• Service Temperature Range: -54°C to +121°C (-65°F to +250°F)
• Intermittent Temperature Exposure: Up to +135°C (+275°F)
• Specific Gravity (Cured): 1.50
• Non-Volatile Content: 98%
• Ultimate Hardness: 47 Shore A
• Tensile Strength: 2.69 MPa (430 psi)
• Elongation: 235%
• Application Life: 30 minutes (B-1/2), 1 hour (B-1), 2 hours (B-2)
• Storage Life: Minimum 9 months

Approvals & Specifications

• AMS-G-25667 (Glass)
• MIL-PRF-8184 (Acrylic)
• AMS-P-83310 (Polycarbonate)
• AMS4045 (Aluminium)
• MIL-PRF-85285 (Urethane Topcoat)
• Compatible with PR-1861 Adhesion Promoter

Typical Applications

• Aircraft windshield sealing
• Aircraft canopy installation and repair
• Glass, acrylic and polycarbonate transparency sealing
• Aircraft cockpit window maintenance
• OEM aircraft manufacturing
• Aircraft maintenance, repair and overhaul (MRO)
• General aerospace weatherproof sealing applications

Key Features & Benefits

• Chrome-free formulation supports modern environmental requirements.
• Fast curing significantly reduces maintenance turnaround time.
• Excellent adhesion to aircraft transparency materials.
• Formulated to prevent crazing of acrylic and polycarbonate.
• Outstanding UV and weather resistance.
• Excellent rain erosion resistance and buffing capability.
• Maintains flexibility at temperatures down to -54°C.
• Excellent repairability to both fresh and aged sealant.
• Compatible with a wide range of aircraft substrate materials.

Application Guidelines

• Abrade plastic substrates with 220-grit or finer abrasive paper before cleaning.
• Clean glass surfaces using cerium oxide polish.
• Clean all substrates using approved aerospace solvents and lint-free cloths conforming to AMS 3819.
• Apply PR-1861 Adhesion Promoter in a thin, uniform coat and allow approximately 30 minutes to dry.
• Do not apply adhesion promoter below 7°C (45°F).
• Apply the sealant within 8 hours after priming.
• Mix both components thoroughly before application, ensuring no unmixed material remains in the container.

Compatibility & Limitations

• Compatible with properly prepared glass, acrylic and polycarbonate substrates.
• Suitable for aluminium and painted aerospace surfaces.
• Requires PR-1861 Adhesion Promoter for optimum adhesion.
• Do not use adhesion promoter containing particles or precipitate.
• Surface preparation should follow SAE AIR 4069 recommendations.

Packaging & Procurement

• Supplied in SEMKIT® cartridges
• Minimum shelf life: 9 months
• Store between 5°C and 27°C in original unopened containers
• Available through PPG Aerospace authorised distributors

Why This Product is Chosen for AOG / MRO

• Fast cure minimises aircraft downtime during transparency replacement.
• Chrome-free formulation supports modern aerospace maintenance requirements.
• Excellent weather resistance ensures long-term durability.
• Maintains flexibility and adhesion under demanding operating conditions.
• Provides reliable sealing for critical cockpit transparencies.

Practical Suggestions for Your Team (AOG Mindset)

• Select the appropriate Class B application life based on the repair size.
• Always prepare and prime substrates immediately before sealing.
• Keep adhesion promoter and sealant within their recommended application windows.
• Use fresh lint-free cloths throughout the cleaning process.
• Store unopened cartridges within the recommended temperature range to maximise shelf life.

Manufacturer / Aviation Spec Codes

• Product Name: PR-1425CF Class B Windshield and Canopy Sealant
• Manufacturer: PPG Aerospace (PRC-DeSoto)
• Product Type: Chrome-free two-component polysulfide sealant
• Compatible Primer: PR-1861 Adhesion Promoter
• Primary Specifications: AMS-G-25667, MIL-PRF-8184, AMS-P-83310, MIL-PRF-85285