PPG PR1428B-2 (1-ea-S654)

PR-1428 Class B Access Door Sealant / FR-1478 Low Adhesion Sealant

Overview

PR-1428 Class B is a two-part, manganese dioxide-cured polysulfide sealant designed for aerospace access door sealing and form-in-place (FIP) gasket applications. It cures at room temperature into a flexible, removable seal that adheres well to common aircraft substrates while maintaining chemical and environmental resistance. The material is also used to protect electrical wiring, terminals, and equipment from fuel, moisture, dirt, and short circuits.

FR-1478 Class B is a related low-adhesion sealant designed for similar aerospace sealing and protective applications, including access door sealing and FIP gasket formation, where removability and controlled adhesion are required.

Key Technical Specs

• Product Type: Two-part polysulfide aerospace sealant
• Cure Mechanism: Manganese dioxide cured (room temperature)
• Application Form: Thixotropic paste (extrusion gun or spatula)
• Mix Ratio: 10:1 (by weight, typical)
• Colour: Black / Red / Dark red (varies by part system)
• Service Temperature: -54°C to 121°C (-65°F to 250°F)
• Intermittent Exposure: Up to 135°C (275°F)
• Hardness: Durometer A (typical cured range ~50)

Performance Characteristics

• Low sag / thixotropic consistency for vertical application control
• Removable seal formulation for access panels
• Resistant to hydrocarbon fuels and hydraulic fluids
• Maintains flexibility at low temperatures without cracking
• Good adhesion to aluminium, titanium, stainless steel, and primed substrates
• Service proven under aerospace environmental exposure conditions

Typical Applications

• Aerospace access door sealing systems
• Form-in-place (FIP) gasket fabrication
• Electrical wire and terminal protection
• Fuel, moisture, and debris sealing barriers
• Aircraft structural joint sealing in removable assemblies

Application Guidelines

• Apply using extrusion gun or spatula to prepared surfaces
• Ensure substrates are clean, dry, and solvent-wiped before application
• Use lint-free cloths and approved solvents only
• Remove contaminants such as grease, oil, and processing residues
• Do not allow solvent to evaporate before wiping dry
• Allow full room-temperature cure prior to service exposure

Surface Preparation

• Clean surfaces immediately prior to sealing application
• Use approved aerospace solvents and lint-free wipes
• Clean one small area at a time to prevent recontamination
• Dry surface thoroughly before sealant application
• Verify adhesion compatibility on specific substrates prior to production use

Compatibility & Safety Notes

• Designed for aluminium, titanium, stainless steel, and primed aerospace coatings
• Resistant to fuel immersion and hydraulic fluids
• Low-temperature flexibility down to -54°C
• Refer to SDS before handling
• Industrial use only

Storage & Shelf Life

• Store below 27°C (80°F)
• Shelf life: Minimum 12 months in original unopened containers

Why This Product is Chosen for Aerospace Maintenance

• Reliable removable sealing for access panels and inspection points
• Maintains integrity under fuel and hydraulic exposure
• Flexible across wide temperature ranges for flight environments
• Supports repeat maintenance cycles without surface damage

Manufacturer / Product Codes

• Product Name: PR-1428 Class B
• Related Product: FR-1478 Class B Low Adhesion Sealant
• Type: Aerospace polysulfide sealant system
• Application: Access door sealing and FIP gasket formation