--- product_id: 10033880 title: "3M Aluminum Foil Tape 3340, 2.5\" x 50 yd, 4.0 mil, Silver" brand: "3m" price: "R2052" currency: ZAR in_stock: true category: "3 M" url: https://www.desertcart.co.za/products/10033880-3m-aluminum-foil-tape-3340-2-5-x-50-yd store_origin: ZA region: South Africa --- # Moisture & chemical resistant - long-lasting seal Operates from -40°F to 300°F - extreme temp range 4.0 mil total thickness - durable & strong 3M Aluminum Foil Tape 3340, 2.5" x 50 yd, 4.0 mil, Silver **Brand:** 3m **Price:** R2052 **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 by 3m - **How much does it cost?** R2052 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/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 - • **Certified Reliability:** UL181A-P and UL181B-FX listings guarantee trusted performance and peace of mind on every project. - • **Effortless Application:** Easy-release poly coated kraft paper liner keeps adhesive fresh and ready, speeding up your workflow. - • **Superior Vapor Barrier:** Low moisture vapor transmission rate locks out moisture, dust, and chemicals to protect your systems. - • **Industrial-Grade Durability:** 4.0 mil aluminum foil backing ensures unmatched strength and longevity for demanding HVAC and industrial applications. - • **Extreme Temperature Resilience:** Withstands harsh environments from freezing -40°F to scorching 300°F, perfect for any climate or season. ## Overview 3M Aluminum Foil Tape 3340 is a premium 2.5" x 50 yd tape featuring a robust 4.0 mil thickness with a 2.0 mil aluminum foil backing and pressure-sensitive acrylic adhesive. Engineered for HVAC duct sealing and industrial use, it excels in extreme temperatures (-40°F to 300°F), offers superior moisture and chemical resistance, and meets UL181A-P and UL181B-FX standards. Designed for professionals demanding durability, reliability, and ease of use in sealing, patching, and vapor barrier 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. ## 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 Material | Acrylic | | Adhesive Side Count | 1 | | Best Sellers Rank | #3,689 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #42 in Duct Tape | | 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 4.7 out of 5 stars (2,074) | | Foil Thickness | 4 mils | | 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 Highlight | HVAC, Sealing and Patching Hot and Cold Air Ducts, Fiberglass Duct Board, Insulation, Metal Repair | | Item Resistance | Moisture Resistant, Water Resistant | | Item Thickness | 4 mils | | Item Weight | 8 ounces | | Manufacturer | 3M | | 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. | | Surface Recommendation | Metal | | Tensile Strength | 29 pounds | | UPC | 051111078112 | | Unit Count | 1 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 - Image 1](https://m.media-amazon.com/images/I/41SY7LWLqwL.jpg) ![3M Aluminum Foil Tape 3340, 2.5" x 50 yd, 4.0 mil, Silver - Image 2](https://m.media-amazon.com/images/I/61WyWKFTTVL.jpg) ## Available Options This product comes in different **Pattern, Color, Size** options. ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.za/products/10033880-3m-aluminum-foil-tape-3340-2-5-x-50-yd](https://www.desertcart.co.za/products/10033880-3m-aluminum-foil-tape-3340-2-5-x-50-yd) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-09-18*