---
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: "¥14872"
currency: JPY
in_stock: true
category: "3 M"
url: https://www.desertcart.jp/products/10033880-3m-aluminum-foil-tape-3340-2-5-x-50-yd
store_origin: JP
region: Japan
---

# Moisture & chemical resistant barrier Operates from -40°F to 300°F 4.0 mil total thickness for durability 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:** ¥14872
**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?** ¥14872 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/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

- • **Precision Adhesion:** Pressure-sensitive acrylic adhesive ensures a rock-solid, vapor-tight seal every time.
- • **Certified Reliability:** UL181A-P and UL181B-FX listings guarantee professional-grade performance you can trust.
- • **Effortless Application:** Easy-release poly coated kraft liner keeps tape fresh and ready, speeding up your workflow.
- • **Industrial-Grade Durability:** 4.0 mil thick aluminum foil backing shields against moisture, dust, and chemicals—built to last.
- • **Unmatched Thermal Resilience:** Seals tight from freezing cold to scorching heat (-40°F to 300°F) for HVAC systems that never quit.

## 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 to withstand extreme temperatures from -40°F to 300°F, it provides a moisture and chemical-resistant vapor seal ideal for duct closure and insulation applications. Certified to UL181A-P and UL181B-FX standards, this tape delivers long-lasting durability and professional reliability for industrial HVAC, metal repair, and insulation sealing needs.

## 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.

## 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 | #2,948 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #39 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 2,038 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 | 4 Mils |
| Item Weight | 0.5 Pounds |
| 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/61WyWKFTTVL.jpg)

## Available Options

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

## Frequently Bought Together

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-08-15*