---
product_id: 10033880
title: "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: "VT17695"
currency: VUV
in_stock: true
reviews_count: 13
category: "3 M"
url: https://www.desertcart.vu/products/10033880-aluminum-foil-tape-3340-2-5-x-50-yd-4
store_origin: VU
region: Vanuatu
---

# Moisture & chemical barrier - long-lasting seal Operates from -40°F to 300°F - extreme temp range 4.0 mil total thickness - durable & strong 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:** VT17695
**Availability:** ✅ In Stock

## Summary

> 🔥 Seal like a pro, last like a legend 🛡️

## Quick Answers

- **What is this?** 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?** VT17695 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/10033880-aluminum-foil-tape-3340-2-5-x-50-yd-4)

## 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

- • **Unmatched Durability:** 4.0 mil thick aluminum foil backing ensures a robust, tear-resistant seal that stands the test of time.
- • **Certified Reliability:** UL181A-P and UL181B-FX listings guarantee industry-grade quality and peace of mind.
- • **Effortless Application:** Easy-release poly coated kraft liner keeps adhesive fresh and ready for quick, professional use.
- • **Superior Vapor Barrier:** Blocks moisture, dust, and chemicals to maintain airtight, energy-efficient ductwork.
- • **Extreme Temperature Resilience:** Performs flawlessly from freezing -40°F to scorching 300°F, perfect for any HVAC environment.

## Overview

3M Aluminum Foil Tape 3340 is a premium 2.5" x 50 yd HVAC sealing tape featuring a 4.0 mil thick aluminum foil backing combined with a pressure-sensitive acrylic adhesive. Engineered to withstand extreme temperatures from -40°F to 300°F, it provides a durable vapor barrier against moisture, dust, and chemicals. Certified to UL181A-P and UL181B-FX standards, this tape ensures reliable, long-lasting duct sealing and patching for professional-grade HVAC, insulation, and metal repair applications.

## 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: 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.
Review: Best HVAC Tape I Ever Used & Will Always Use - I have been doing heating and air conditioning with going to school over 30 years ago. Yes, you will find much aluminum tape that is less expensive on desertcart for sure. I have always used this with it being made by 3M knowing how good it is and would say out of all different aluminum tapes. I’ve used this is 10 times better than any other tape I ever used. Surprises me it’s not much more expensive with how unbelievable it really is and if you purchase it versus cheaper ones, you know by the odor of the adhesive that is on it. Other stuff I’ve used did not only stick the greatest. Yes it’s stuck on any ductwork. I put it on this made by 3M. Wow. Even if you do not do HVAC for a living and need aluminum tape, this is beyond your best choice believe me.

## 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 |
| Best Sellers Rank | #2,357 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #25 in Duct Tape |
| Brand | 3M |
| Color | Silver |
| Compatible Material | Acrylic,aluminum,automotive,glass,kraft Paper,metal |
| Date First Available | July 15, 2013 |
| Global Trade Identification Number | 00051111078112 |
| Is Discontinued By Manufacturer | No |
| Item Thickness | item_thickness.string_value Inches |
| Item Weight | 8 ounces |
| Item model number | 70006658481 |
| Manufacturer | 3M |
| Material | solid |
| Number of Items | 1 |
| Product Dimensions | 2.5"L x 2.5"W |
| Recommended Uses For Product | Sealing |
| Size | 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

![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** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Best HVAC Tape I Ever Used & Will Always Use
*by J***Y on July 21, 2025*

I have been doing heating and air conditioning with going to school over 30 years ago. Yes, you will find much aluminum tape that is less expensive on Amazon for sure. I have always used this with it being made by 3M knowing how good it is and would say out of all different aluminum tapes. I’ve used this is 10 times better than any other tape I ever used. Surprises me it’s not much more expensive with how unbelievable it really is and if you purchase it versus cheaper ones, you know by the odor of the adhesive that is on it. Other stuff I’ve used did not only stick the greatest. Yes it’s stuck on any ductwork. I put it on this made by 3M. Wow. Even if you do not do HVAC for a living and need aluminum tape, this is beyond your best choice believe me.

### ⭐⭐⭐⭐⭐ Foil tape
*by J***R on December 27, 2025*

Works and sticks good sealing duct frame for filters. USN came out with duct tape, submarines would use it to stick problem people to ceilings (no joke)

## 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
- Aluminum Foil Tape, 2 inch x 65 Feet (3.9 mil), Insulation Adhesive Metal High Temperature Heavy Duty HVAC Tape, Silver for Ductwork, Dryer Vent, HVAC

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-03-19*