Professional-grade aluminum foil tape with acrylic adhesive for heat shielding, sealing, and masking in industrial applications. UL rated, flame-resistant, withstands extreme temperatures and harsh environments.
3M™ Heavy Duty Aluminum Foil Tape 438 is a premium high-performance foil tape engineered for demanding industrial applications across aerospace, automotive, construction, electronics, and manufacturing sectors. Featuring a dead soft aluminum foil backing with highly engineered pressure-sensitive acrylic adhesive, this professional-grade tape delivers exceptional heat shielding, heat reflecting, seaming, and sealing capabilities. The thermally conductive aluminum backing effectively dissipates heat across the tape surface to reduce hot spots and protect substrates from high-temperature effects while maintaining a strong, reliable bond even in harsh conditions.
This industrial-strength tape withstands extreme exposure to high heat, humidity, flame, weathering, moisture, UV radiation, and solvents, making it ideal for both indoor and outdoor applications. With a temperature use range from -65°F to 300°F (-54°C to 149°C), it provides excellent work life and durability in demanding environments. The tape is UL Recognized to UL 746C (File E 122798) and Classified by UL to UL 723 Class "L" for low flammability rating (File R 7311), meeting FAR 25.853(a) requirements for aerospace applications.
Each case contains 2 rolls of 60-yard lengths with 4-inch width and 7.2-mil total thickness, providing ample coverage for large-scale industrial projects. The highly engineered acrylic adhesive ensures long-term durability while removing cleanly after harsh masking applications, making it versatile for heat shielding of delicate parts, refrigerator and freezer coil attachment, plastic protection against heat and UV exposure, and moisture barrier applications.
Key Features
- Heavy duty dead soft aluminum foil backing provides increased effectiveness for heat shielding in demanding applications
- Highly engineered acrylic adhesive delivers long-term durability while removing cleanly after harsh masking applications
- Withstands exposure to flame, weathering, moisture, UV radiation, and solvents for superior protection
- Temperature range from -65°F to 300°F (-54°C to 149°C) with excellent thermal conductivity for heat dissipation
- UL Recognized to UL 746C and Classified by UL 723 Class L for low flammability rating, meets FAR 25.853(a) aerospace standards
Technical Specifications
| Specification |
Value |
| Product Name | 3M™ Heavy Duty Aluminum Foil Tape 438 |
| Part Number | 438 |
| UPC Code | 00051125853309 |
| Backing Material | Dead Soft Aluminum Foil |
| Adhesive Type | Acrylic, Pressure-Sensitive |
| Product Color | Silver |
| Overall Width (Imperial) | 4 inches |
| Overall Width (Metric) | 101.6 mm |
| Overall Length (Metric) | 54.86 meters (60 yards per roll) |
| Backing Thickness (Imperial) | 5 mil |
| Backing Thickness (Metric) | 0.13 mm |
| Total Tape Thickness (Imperial) | 7.2 mil |
| Total Tape Thickness (Metric) | 0.18 mm |
| Adhesive Thickness (Metric) | 0.13 mm |
| Tensile Strength (Imperial) | 59 lb/in |
| Tensile Strength (Metric) | 103 N/100mm |
| Elongation at Break | 10% |
| Minimum Operating Temperature (Fahrenheit) | -65°F |
| Minimum Operating Temperature (Celsius) | -54°C |
| Maximum Operating Temperature (Fahrenheit) | 300°F |
| Maximum Operating Temperature (Celsius) | 149°C |
| Shelf Life | 24 Months |
| Smallest Saleable Unit | Roll |
| Packaging | 2 Rolls per Case |
| UL Recognition | UL Recognized to UL 746C (File E 122798) |
| UL Classification | UL 723 Class L for Low Flammability Rating (File R 7311) |
| FAR Compliance | Meets FAR 25.853(a) |
| Brand | 3M™ |
| Industries | Aerospace, Appliance, Automotive, Construction, Electronics, General Industrial, Metalworking, Military & Government, Specialty Vehicles, Transportation |
| Recommended Applications | Heat shielding, heat reflecting, moisture barrier, seaming, sealing, refrigerator/freezer coil attachment, plastic protection |
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