3M 427 (450MM X 55M ROLL)

Additional Product Information

Overview

Aluminum Foil Tape 425 and 427 are dead-soft aluminum foil tapes with a transparent acrylic adhesive designed for demanding aviation, MRO, and industrial environments. These tapes provide reliable sealing, moisture resistance, heat reflection, and flame resistance, making them ideal for aircraft maintenance teams that require fast, durable repairs and dependable masking or shielding solutions during AOG situations.

Key Technical Specs for Aluminum Foil Tape 425 • 427

• Type: Dead-soft aluminum foil tape with acrylic adhesive
• Standard Roll Length: 60 yd (55 m)
• Color: Shiny silver
• Backing Thickness: 2.8 mil (0.07 mm)
• Total Tape Thickness: 4.6 mil (0.12 mm)
• Liner Thickness (427): 3.1 mil (0.08 mm)
• Adhesion to Steel: 425 – 47 oz/in (51 N/100 mm); 427 – 50 oz/in (55 N/100 mm)
• Tensile Strength: 30 lb/in (525 N/100 mm)
• Elongation at Break: 8%
• Cure/Working Time: Immediate bond upon application
• Service Temperature Range: -65°F to 300°F (-54°C to 149°C)
• Water Vapor Transmission Rate: 0.1 g H?O/100 sq in/24 hr (1.55 g/m²/24 hr)
• Typical Uses: Sealing, heat reflection, masking, patching, and moisture barrier

Approvals & Specifications

• UL 746C Flame Resistance (File E122798)
• UL 723 Class “L” Low Flammability (File R7311)
• Meets F.A.R. 25.853(a) requirements
• 425 can be certified to SAE-AMS-T-23397
• 425 can be certified to L-T-80B
• Manufactured under ISO 9001 quality system

Typical Aircraft MRO / AOG Applications

• Aircraft paint stripping maskant
• Temporary aircraft skin and trailer repairs
• Heat shielding and thermal reflection
• Wire and cooling coil securing in aircraft systems
• Foil splicing and sealing in avionics and cabin equipment
• Moisture barrier and vapor sealing
• General purpose patching and sealing indoors or outdoors

Compatibility & Safety Notes

• Best applied to clean, dry surfaces above 32°F (0°C)
• Compatible with aluminum, steel, plastics, and painted surfaces
• Not intended or approved for medical use
• Use appropriate PPE during application in industrial environments
• User must evaluate suitability for specific substrates and conditions

Packaging & Procurement

• Standard roll length: 60 yd (55 m)
• Available with or without easy-release liner (427 includes liner)
• Store at 60–80°F (16–27°C) and 40–60% RH
• Ships in original cartons for product protection
• Easy manual application with strong pressure-sensitive bonding

Why Aluminum Foil Tape 425 • 427 is Chosen for AOG / MRO

• Fast application with immediate adhesion
• Excellent moisture and vapor barrier performance
• High heat and flame resistance for safety-critical environments
• Versatile for repair, masking, and sealing tasks
• Reliable performance in extreme temperature ranges

Practical Suggestions for Your Team (AOG Mindset)

• Stock multiple roll sizes for rapid deployment during AOG events
• Store in controlled temperature and humidity environments
• Train technicians on surface preparation for maximum adhesion
• Keep rolls in mobile repair kits for field maintenance

Manufacture / Aviation Spec Codes

• Manufacturer: 3M Industrial Adhesives & Tapes Division
• Product IDs: 425 and 427
• UL File: E122798 / R7311
• SAE Spec (425): AMS-T-23397
• Military Spec (425): L-T-80B

Alternative Names & Descriptions

• Aluminum Foil Adhesive Tape 425
• Aluminum Foil Adhesive Tape 427
• High-Temperature Aluminum Sealing Tape
• Aviation Heat Shield Foil Tape
• Flame-Resistant Aluminum Repair Tape