3M™ 425 and 427 Aluminum Foil Tapes
3M™ Aluminum Foil Tapes 425 and 427 are high-performance metal-backed tapes designed for demanding thermal, electrical, and moisture barrier applications. These tapes are the go-to choice for a broad range of challenging applications. They conform easily to irregular surfaces while providing excellent heat reflectivity, conductivity, and chemical resistance. 3M 425 is a standard roll version, while 3M 427 is a linered version for die-cutting and more precise application processes. Both are engineered for long-lasting adhesion and performance in a range of extreme conditions.
Applications include: Heat shielding, EMI/RFI shielding, moisture barriers, chemical masking, and high-temperature sealing.
- Excellent heat reflectivity and conductivity
- Flame, chemical, UV, weathering, and moisture resistant
- 427 version includes liner for die-cutting and precision use
| Property | Specification |
| Backing (Carrier) Material | 2.8 mil dead-soft aluminum foil |
| Adhesive Material | 1.8 mil Acrylic |
| Adhesion to Steel (D3330) | 47 oz/in |
| Tensile Strength (kPa) | 193 kPa |
| Tensile Strength (PSI) | 28 psi |
| Elongation at Break | 6% |
| Shielding Effectiveness (Average 300kHz - 2.5GHz) | |
| Product Color | Shiny silver |
| Insulation Resistance | |
| Certifications | UL746C Recognized (File E122798), Classified to UL723 L (File R7311), meets F.A.R. 25.853(a), can be certified to L-T-80C, SAE AMS T23397 |
| Thickness (Imperial) | 4.6 mil |
| Thickness (Metric) | 0.12mm |
| Maximum Operating Temperature (Celsius) | 149°C |
| Maximum Operating Temperature (Fahrenheit) | 300°F |
| Minimum Operating Temperature (Celsius) | -54°C |
| Minimum Operating Temperature (Fahrenheit) | -65°F |
