Premium linered aluminum foil tape with silicone adhesive for high-temperature heat shielding, withstands up to 600°F, flame resistant, ideal for aerospace and industrial applications
The 3M™ High Temperature Aluminum Foil Tape 433L is a premium linered version of the standard 433 tape, specifically engineered for demanding heat shielding applications. This dead soft aluminum foil tape is coated with a clear silicone pressure-sensitive adhesive that bonds exceptionally well to a variety of surfaces while maintaining superior performance in high-temperature environments where conventional adhesive tapes fail. The tape measures 6 inches wide by 60 yards long with a 3.5 mil total thickness and 2 mil backing thickness, making it ideal for seaming, sealing, and splicing operations in aerospace, automotive, and industrial applications.
Designed to withstand limited exposure up to 600°F (316°C), this thermally conductive tape helps dissipate heat to protect temperature-sensitive materials and improve heating and cooling efficiency. The dead soft aluminum foil backing conforms easily to curved and uneven surfaces, providing reliable coverage and protection. It meets the stringent flame resistance requirements of F.A.R. 25.853(a) and is recognized as a UL component (file QQQW2.MH122798), ensuring compliance with aerospace and safety standards. The tape features an easy-release film liner that makes it suitable for die-cutting operations.
With an impressive performance range from -65°F to 600°F (-54°C to 316°C), the 433L tape delivers consistent, reliable bonding even in extreme temperature conditions. Each case contains 2 rolls, providing 120 yards of total coverage. The silicone adhesive formulation ensures excellent adhesion to difficult substrates including metals, composites, and other industrial surfaces. This industrial-grade tape is recommended for high-temperature heat shielding applications, splicing jumbo rolls of aluminum foil, holding the last lap of narrow-width rolls during metal annealing processes, and covering heating elements or wires to distribute heat effectively.
Key Features
- Withstands continuous exposure up to 600°F (316°C) for superior heat protection
- Dead soft aluminum foil backing conforms to curved and uneven surfaces
- Clear silicone pressure-sensitive adhesive bonds to difficult substrates
- Thermally conductive tape helps dissipate heat and improve efficiency
- Meets F.A.R. 25.853(a) flame resistance and UL recognition requirements
- Linered version suitable for die-cutting operations
- Wide temperature performance range from -65°F to 600°F (-54°C to 316°C)
- Excellent adhesion in high-temperature environments where other tapes fail
Technical Specifications
| Specification |
Value |
| Product Type | High Temperature Aluminum Foil Tape |
| Model Number | 433L |
| Brand | 3M™ |
| Overall Width (Imperial) | 6 inches |
| Overall Width (Metric) | 152.4 mm |
| Overall Length (Imperial) | 60 yards |
| Overall Length (Metric) | 54.86 meters |
| Total Tape Thickness without Liner | 3.5 mil |
| Backing (Carrier) Thickness (Imperial) | 2 mil |
| Backing (Carrier) Thickness (Metric) | 0.05 mm |
| Back Side Adhesive Thickness | 1.5 mil |
| Backing Material | Aluminum Foil - Dead Soft |
| Adhesive Type | Silicone Pressure-Sensitive |
| Primary Liner | Easy Release Film |
| Product Color | Silver |
| Tensile Strength (Imperial) | 20 lb/in |
| Tensile Strength (Metric) | 35 N/100mm |
| Elongation at Break | 3.5% |
| Maximum Operating Temperature (Fahrenheit) | 600°F |
| Maximum Operating Temperature (Celsius) | 316°C |
| Minimum Operating Temperature (Fahrenheit) | -65°F |
| Minimum Operating Temperature (Celsius) | -54°C |
| Temperature Performance Range | -65°F to 600°F (-54°C to 316°C) |
| Specifications Met | FAR 25.853(a) - Flame Resistant |
| UL Recognition | UL Recognized Component (File QQQW2.MH122798) |
| Shelf Life | 18 Months |
| Units per Case | 2 rolls |
| Smallest Saleable Unit | Roll |
| Part Number | 433L |
| 3M Product Number | 433L |
| 3M ID | 7010334620 |
| UPC | 00051115171987 |
| Industries | Aerospace, Appliance, Automotive, Construction, Electronics, General Industrial, Metalworking, Military, Military & Government, Specialty Vehicles, Transportation |
| Thermal Conductivity | Thermally conductive for heat dissipation |
| Conformability | Conforms to curved and uneven surfaces |
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