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

PR-1425CF Class B

Overview

PR-1425CF Class B Windshield and Canopy Sealant is a fast-curing, chrome-free aerospace polysulfide sealant specifically developed for aircraft transparencies including windshields and canopies. Designed to provide excellent adhesion to glass, acrylic, polycarbonate, and metallic substrates, this low-sag sealant offers outstanding UV resistance, weather durability, and anti-crazing performance for aerospace glazing systems.

Key Technical Specs

• Product Type: Two-part polysulfide windshield and canopy sealant
• Cure System: Manganese dioxide cured
• Colour: Black
• Mix Ratio: 20:100 by weight (Part A : Part B)
• Base Viscosity: 20,000 poise (2000 Pa-s)
• Service Temperature Range: -65°F to +250°F (-54°C to +121°C)
• Intermittent Temperature Resistance: Up to +275°F (+135°C)
• Non-Volatile Content: 98%
• Cured Specific Gravity: 1.50
• Ultimate Cure Hardness: 47 Shore A
• Tensile Strength: 430 psi (2.69 MPa)
• Elongation: 235%
• Tack Free Time: Less than 4�8 hours depending on class
• Accelerated Cure Option: 4 hours at 125°F (52°C)
• Shelf Life: Minimum 9 months

Approvals & Specifications

• Tested to PRC-DeSoto International aerospace specification methods
• Compatible with AMS-G-25667 glass substrates
• Compatible with MIL-PRF-8184 acrylic substrates
• Compatible with AMS-P-83310 polycarbonate substrates
• Compatible with MIL-PRF-85285 urethane topcoat systems
• Surface preparation guidance references SAE AIR 4069

Typical Applications

• Aircraft windshield sealing
• Aircraft canopy sealing systems
• Transparency bonding and sealing applications
• Aerospace glazing protection systems
• Aircraft window perimeter sealing
• UV and weather resistant aircraft sealant repairs

Compatibility & Safety Notes

• Designed specifically to avoid crazing of acrylic and polycarbonate transparencies
• Use PR-1861 Adhesion Promoter for optimum substrate adhesion
• Plastic substrates should be abraded with 220 grit or finer abrasive
• Glass surfaces should be cleaned using Cerium Oxide polish
• Use lint-free cloths conforming to AMS 3819 during cleaning
• Sealant must be applied within 8 hours of adhesion promoter application
• Do not apply adhesion promoter below 45°F (7°C)
• Refer to Safety Data Sheet (SDS) before use

Packaging & Procurement

• Supplied in SEMKIT® cartridges
• Available through PPG Aerospace distribution channels
• Designed for extrusion gun or spatula application
• Store unopened between 40°F and 80°F (5°C to 27°C)

Why This Product is Chosen for AOG / MRO

• Fast curing profile reduces aircraft downtime
• Excellent UV and weather resistance for exterior aircraft exposure
• Anti-crazing formulation protects sensitive transparency materials
• Strong adhesion across common aerospace substrates
• Good repairability to both fresh and aged sealant fillets
• Excellent rain erosion resistance and buffing characteristics
• Chrome-free formulation supports environmental compliance objectives

Practical Suggestions for Your Team (AOG Mindset)

• Always verify substrate cleanliness before sealant application
• Use fresh lint-free cloths and approved solvents during preparation
• Avoid contamination by pouring solvent onto cloth rather than directly onto surfaces
• Ensure adhesion promoter film is thin and uniform
• Monitor application life closely during field repairs
• Use accelerated cure schedule where rapid return-to-service is required
• Inspect cured fillets for complete adhesion and flexibility before release

Manufacturer / Aviation Spec Codes

• Product Name: PR-1425CF Class B
• Product Type: Aircraft windshield and canopy sealant
• Manufacturer: PRC-DeSoto International / PPG Aerospace
• Adhesion Promoter: PR-1861
• Sealant Chemistry: Manganese dioxide cured polysulfide
• Packaging System: SEMKIT® cartridge