---
product_id: 10033880
title: "3M Aluminum Foil Tape 3340, 2.5\" x 50 yd, 4.0 mil, Silver, HVAC, Sealing and Patching Hot and Cold Air Ducts, Fiberglass Duct Board, Insulation, Metal Repair"
brand: "3m"
price: "€ 77.82"
currency: EUR
in_stock: true
reviews_count: 13
category: "3 M"
url: https://www.desertcart.hr/products/10033880-3m-aluminum-foil-tape-3340-2-5-x-50-yd
store_origin: HR
region: Croatia
---

# Strong acrylic adhesive - long-lasting seal -40°F to 300°F operational range 4.0 mil total thickness - ultra durable 3M Aluminum Foil Tape 3340, 2.5" x 50 yd, 4.0 mil, Silver, HVAC, Sealing and Patching Hot and Cold Air Ducts, Fiberglass Duct Board, Insulation, Metal Repair

**Brand:** 3m
**Price:** € 77.82
**Availability:** ✅ In Stock

## Summary

> 🔥 Seal Like a Pro, Last Like a Legend 🛠️

## Quick Answers

- **What is this?** 3M Aluminum Foil Tape 3340, 2.5" x 50 yd, 4.0 mil, Silver, HVAC, Sealing and Patching Hot and Cold Air Ducts, Fiberglass Duct Board, Insulation, Metal Repair by 3m
- **How much does it cost?** € 77.82 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/10033880-3m-aluminum-foil-tape-3340-2-5-x-50-yd)

## Best For

- 3m enthusiasts

## Why This Product

- Trusted 3m brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Effortless Application:** Easy-release poly coated liner keeps adhesive pristine and ready, making your sealing projects smooth and precise.
- • **Certified Quality Assurance:** UL181A-P and UL181B-FX listings guarantee professional-grade reliability and peace of mind on every job.
- • **Industrial-Grade Durability:** 4.0 mil thick aluminum foil backing ensures unmatched strength and longevity for demanding HVAC applications.
- • **Moisture & Chemical Barrier:** Foil backing blocks moisture, dust, and chemicals, protecting your HVAC system and boosting energy efficiency.
- • **Extreme Temperature Resilience:** Operates flawlessly from -40°F to 300°F, sealing hot and cold ducts without fail—no more seasonal tape failures.

## Overview

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 for extreme temperature ranges (-40°F to 300°F), it provides a durable vapor seal on fiberglass duct boards and flexible air ducts. Its moisture, dust, and chemical-resistant properties, combined with UL181A-P and UL181B-FX certifications, make it the trusted choice for professionals seeking long-lasting, reliable duct sealing solutions.

## Description

When sealing ducts and other surfaces for heating, ventilation and air conditioning systems (HVAC), it's essential to have a strong, long-lasting foil tape that can stand up well to hot and cold temperatures. The 3M Foil Tape 3340 has the combination of 2.0 mil aluminum foil backing and strong, pressure sensitive acrylic adhesive that gives our tape a superb operational temperature range of -40°F (-40°C) to 300°F (149°C) making it ideal for sealing rigid fiberglass duct boards and flexible air duct systems. The foil backing also serves as an excellent barrier against moisture, dust and many chemicals — making it strong, durable and long-lasting. The very low moisture vapor transmission rate makes the tape a good sealant and the acrylic adhesive supplies superior temperature and UV resistance to give you a strong, lasting and reliable bond. It also has an easy releasing poly coated kraft paper liner to protect the adhesive and keep the tape ready for use. 3340 tape meets requirements for UL 181 A-P and UL 181 B-FX Listings as a measure of reliability and quality standards. 3M Foil Tape 3340 is used in a variety of applications including heating ventilation air conditioning (HVAC), duct closure, vapor seal on reinforced fiberglass duct board, rigid fiber glass duct board, and flexible air ducts and air connectors across a number of industries, including: transportation, specialty vehicle, metalworking, construction, automotive, military and government, general industrial, MRO, electronics and aerospace.

Review: This Is the Good Stuff - Don't Skimp on This One - I am all for saving money where you can, but there are certain things where buying the cheap version just is not worth it. Foil tape for ducts and vents is one of them. I used this to reseal my dryer vent after cleaning out the duct runs under the house, and also on my AC. It handles both hot and cold applications without breaking down, which is exactly what you need when you are sealing something that is going to see temperature extremes year round. Regular duct tape is not built for that and it will fail on you. 3M quality is immediately noticeable. The tape is thick, the adhesive is strong, and it seals properly when applied correctly. One thing to know going in: it takes a little practice because of the thickness. You want to make sure you are getting full contact with no air gaps, so take your time, go around twice, and use a little more than you think you need until you get the hang of it. If you are a homeowner this should honestly just live in your toolbox permanently. Dryer vents, AC ducts, furnace seams - any time you have a hot or cold air application this is what you want. Buy the real 3M tape. Peace of mind and it’s nice knowing I won’t have to redo it in a year or two.
Review: The high quality aluminum “duct” tape - This is the good one, this stuff is tough too. I always like to have some on hand for projects around the house. You’d be surprised how useful this tape can be once you have some on hand. My dad always used this at work (HVAC) so I’ve learned over the years how to properly use this tape to make my A/C more efficient. This is great for taping up cracks around your furnace or condenser coil. You can also use it to tape the chill line near the outside unit if your lines have areas that are exposed, or if there are places that are beginning to be exposed. You can buy cheaper brands, but there’s some things you shouldn’t buy off brand, and this one of them. Buy the legit 3M tape, it’s worth it. It’ll save you money in the long run as you won’t constantly be having to patch up previous applications. I’m not a certified HVAC tech, but after riding with my dad from elementary school until I graduated, I do know to highly recommend this specific tape. This can also be used on small windows, such as the small window panes on some front/back doors, and for lots of other applications. If you’re a homeowner, I truly believe a roll of this tape should be in your home tool box.

## Features

- VAPOR SEAL TAPE: 2. 0 mil aluminum foil backing (4. 0 mil total thickness) with a strong, pressure sensitive acrylic adhesive is ideal as a vapor seal tape for duct closure.
- HOT AND COLD TEMPERATURES: Combination of a foil backing and acrylic adhesive gives this tape a superb operational temperature range of -40F-300F (-40C-149C).
- EASY RELEASING LINER: Poly coated Kraft paper liner protects the adhesive and keeps the tape ready for use.
- LONG LASTING: The foil backing serves as an excellent barrier against moisture, dust and many chemicals - making it strong, durable and long-lasting.
- APPLICATIONS: Heating Ventilation Air Conditioning (HVAC), duct closure, vapor seal on reinforced fiberglass duct board, rigid fiber glass duct board, flexible air ducts and air connectors.
- Listed for both UL181A-P and UL181B-FX
- For industrial/occupational use only. Not for consumer sale or use

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00DY9IXFI |
| Adhesive Format | Narrow Tape |
| Adhesive Location | Single Sided |
| Adhesive Side Count | 1 |
| Best Sellers Rank | #1,925 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #25 in Duct Tape |
| Brand | 3M |
| Brand Name | 3M |
| Color | Silver |
| Compatible Material | Acrylic,aluminum,automotive,glass,kraft Paper,metal |
| Configuration | 2.5 inches x 50 yards |
| Customer Reviews | 4.7 out of 5 stars 2,025 Reviews |
| Global Trade Identification Number | 00051111078112 |
| Included Components | Aluminum Foil Tape (1 Roll) |
| Item Dimensions L x W x Thickness | 2.5"L x 2.5"W |
| Item Resistance | Moisture Resistant, Water Resistant |
| Item Thickness | item_thickness.string_value Inches |
| Item Weight | 8 ounces |
| Manufacturer | 3M |
| Material | solid |
| Material Type | solid |
| Model | 70006658481 |
| Number of Items | 1 |
| Other Special Features of the Product | Long,Strong |
| Part Number | 3340 |
| Recommended Uses For Product | Sealing |
| Size Name | 2.5 In. X 50 Yd. |
| Special Feature | Long,Strong |
| Surface Recommendation | Metal |
| Tensile Strength | 29 Pounds |
| UPC | 051111078112 |
| Unit Count | 1.0 Count |
| Water Resistance Level | Water Resistant |

## Product Details

- **Brand:** 3M
- **Color:** Silver
- **Material:** solid
- **Number of Items:** 1
- **Recommended Uses For Product:** Sealing

## Images

![3M Aluminum Foil Tape 3340, 2.5" x 50 yd, 4.0 mil, Silver, HVAC, Sealing and Patching Hot and Cold Air Ducts, Fiberglass Duct Board, Insulation, Metal Repair - Image 1](https://m.media-amazon.com/images/I/71OLqOc54vL.jpg)

## Available Options

This product comes in different **Pattern, Color, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ This Is the Good Stuff - Don't Skimp on This One
*by J***S on May 21, 2026*

I am all for saving money where you can, but there are certain things where buying the cheap version just is not worth it. Foil tape for ducts and vents is one of them. I used this to reseal my dryer vent after cleaning out the duct runs under the house, and also on my AC. It handles both hot and cold applications without breaking down, which is exactly what you need when you are sealing something that is going to see temperature extremes year round. Regular duct tape is not built for that and it will fail on you. 3M quality is immediately noticeable. The tape is thick, the adhesive is strong, and it seals properly when applied correctly. One thing to know going in: it takes a little practice because of the thickness. You want to make sure you are getting full contact with no air gaps, so take your time, go around twice, and use a little more than you think you need until you get the hang of it. If you are a homeowner this should honestly just live in your toolbox permanently. Dryer vents, AC ducts, furnace seams - any time you have a hot or cold air application this is what you want. Buy the real 3M tape. Peace of mind and it’s nice knowing I won’t have to redo it in a year or two.

### ⭐⭐⭐⭐⭐ The high quality aluminum “duct” tape
*by P***N on August 23, 2023*

This is the good one, this stuff is tough too. I always like to have some on hand for projects around the house. You’d be surprised how useful this tape can be once you have some on hand. My dad always used this at work (HVAC) so I’ve learned over the years how to properly use this tape to make my A/C more efficient. This is great for taping up cracks around your furnace or condenser coil. You can also use it to tape the chill line near the outside unit if your lines have areas that are exposed, or if there are places that are beginning to be exposed. You can buy cheaper brands, but there’s some things you shouldn’t buy off brand, and this one of them. Buy the legit 3M tape, it’s worth it. It’ll save you money in the long run as you won’t constantly be having to patch up previous applications. I’m not a certified HVAC tech, but after riding with my dad from elementary school until I graduated, I do know to highly recommend this specific tape. This can also be used on small windows, such as the small window panes on some front/back doors, and for lots of other applications. If you’re a homeowner, I truly believe a roll of this tape should be in your home tool box.

### ⭐⭐⭐⭐⭐ Genuine 3M Quality
*by S***. on March 11, 2026*

Genuine 3M product, Quality as expected, Easy to cut to the correct size before placing it, with the backer paper protecting the sticky side, but sticks were you put it. I used this to patch some gaps in aluminum ductwork directly below the furnace output, and it has stayed stuck through both Heating and Cooling cycles.

## Frequently Bought Together

- 3M Aluminum Foil Tape 3340, 2.5" x 50 yd, 4.0 mil, Silver, HVAC, Sealing and Patching Hot and Cold Air Ducts, Fiberglass Duct Board, Insulation, Metal Repair
- Red Devil 0841DX F-Seal 181 Duct Seal, Fiber Reinforced Water Based Duct Sealant, 1 Gallon, Gray, Made in USA
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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-06-21*