Nashua 322 aluminum foil tape are good for taping joints and seams, sealing out moisture, vapor, and for general repairs.Specification: Item: Foil TapeTape Backing Material: AluminumTape Adhesive: RubberTape Thickness: 5 milTape Width: 2 1/2 inTape Length: 50 ydTape Shape: Continuous RollTape Color: SilverMin. Tape Performance Temp.: 40 Degrees FMax. Tape Performance Temp.: 200 Degrees FTape Tensile Strength: 15 lb-inTape Adhesive Strength: 130 oz/inStandards: UL 723Warning: California Residents: This product and/or packaging can expose you to chemicals including Styrene, which is known to the State of California to cause cancer and birth defects or other reproductive harm.