3M™ 425 Aluminum Foil Tape 3M™ The 3M™ 425 Aluminum Foil Tape is a high-performance aluminum tape delivering excellent thermal conductivity and strong resistance to moisture, chemicals and UV exposure; ideal for EMI/RFI shielding, sealing, heat protection and high-temperature masking, it is widely used in electronics, aerospace, HVAC and industrial maintenance applications. Learn more