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3M Aluminum Foil Tape 3340 is a premium 2.5" x 50 yd HVAC sealing tape featuring a robust 4.0 mil thickness with a 2.0 mil aluminum foil backing and pressure-sensitive acrylic adhesive. Engineered to perform flawlessly across a wide temperature range (-40°F to 300°F), it offers superior moisture, dust, and chemical resistance. Certified to UL181A-P and UL181B-FX standards, this tape ensures durable, vapor-tight seals on duct boards, flexible ducts, and metal repairs—trusted by professionals and DIYers alike for lasting HVAC efficiency.


| ASIN | B091QCSQXK |
| Adhesive Format | pressure-sensitive |
| Adhesive Location | SINGLE_SIDED |
| Adhesive Side Count | 1 |
| Best Sellers Rank | #2,169 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #29 in Duct Tape |
| Brand | 3M |
| Brand Name | 3M |
| Color | Silver |
| Compatible Material | Aluminum,acrylic,glass,metal,kraft Paper |
| Configuration | 2.5" x 50 YD x 0.004" |
| Customer Reviews | 4.7 out of 5 stars 2,017 Reviews |
| Foil Thickness | 4 Mils |
| Global Trade Identification Number | 00638060401323 |
| Included Components | Foil Tape |
| Item Dimensions L x W x Thickness | 2.5"L |
| Item Resistance | Chemical Resistant, Dust Resistant, Heat Resistant, Moisture Resistant |
| Item Weight | 0.05 Pounds |
| Manufacturer | 3M |
| Material | Acrylic |
| Material Type | Acrylic |
| Model | 40132 |
| Number of Items | 1 |
| Other Special Features of the Product | Long,Strong |
| Part Number | 40132 |
| Recommended Uses For Product | Sealing |
| Size Name | 2.5 inches x 50 yards x 0.004 inches |
| Special Feature | Long,Strong |
| Surface Recommendation | Plastic |
| UPC | 638060401323 |
| Unit Count | 1.0 Count |
| Water Resistance Level | Waterproof |
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