--- product_id: 58747093 title: "IDEAL Industries 31-601 Duct Seal Compound, 1 lb Block, Gray Putty for Sealing Junction Boxes, Service Entrances & HVAC Penetrations" brand: "ideal industries" price: "€ 16.39" currency: EUR in_stock: true reviews_count: 13 category: "Ideal Industries" url: https://www.desertcart.gr/products/58747093-ideal-industries-31-601-duct-seal-compound-1-lb-block store_origin: GR region: Greece --- # Paintable immediately Air & moisture seal barrier Permanently soft & moldable IDEAL Industries 31-601 Duct Seal Compound, 1 lb Block, Gray Putty for Sealing Junction Boxes, Service Entrances & HVAC Penetrations **Brand:** ideal industries **Price:** € 16.39 **Availability:** ✅ In Stock ## Summary > 🛡️ Seal smart, save energy, and stay ahead of the curve! ## Quick Answers - **What is this?** IDEAL Industries 31-601 Duct Seal Compound, 1 lb Block, Gray Putty for Sealing Junction Boxes, Service Entrances & HVAC Penetrations by ideal industries - **How much does it cost?** € 16.39 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/58747093-ideal-industries-31-601-duct-seal-compound-1-lb-block) ## Best For - ideal industries enthusiasts ## Why This Product - Trusted ideal industries brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Compact Powerhouse:** Convenient 1 lb block provides ample material for multiple sealing jobs—never run out mid-project. - • **Multi-Surface Mastery:** Adheres seamlessly to metal, wood, masonry, and plastic—perfect for electrical, HVAC, and plumbing projects. - • **Flexible Seal That Lasts:** Putty-like compound stays soft, never cracks or shrinks—easy to mold and rework on the fly. - • **Jobsite-Ready & Paintable:** Apply and paint immediately for a clean, professional finish that blends into any environment. - • **Ultimate Barrier Against Elements:** Blocks air leaks, moisture, dust, and drafts to boost energy efficiency and protect installations. ## Overview The IDEAL Industries 31-601 Duct Seal Compound is a durable, flexible gray putty designed to create airtight, moisture-resistant seals around junction boxes, HVAC penetrations, and service entrances. Its permanently soft formula prevents cracking and shrinking, ensuring long-lasting protection across metal, wood, masonry, and plastic surfaces. Ready to use in a convenient 1 lb block, it’s paintable immediately after application, making it ideal for professional and DIY projects that demand reliability and a clean finish. ## Description Seal gaps, protect installations, and improve energy efficiency with the IDEAL 31-601 Duct Seal Compound. Designed for electricians, contractors, and DIYers, this high-performance sealing putty forms a reliable barrier around junction boxes, service entrances, and conduit penetrations. Unlike traditional fillers that dry out or crack, this permanently soft compound stays flexible over time—allowing for easy adjustments without compromising the seal. Its non-toxic, non-corrosive formula makes it safe for use with sensitive electrical components and a wide range of materials including metal, wood, masonry, and plastic. Ideal for both indoor and outdoor applications, this duct seal helps prevent drafts, moisture intrusion, and pest entry—while maintaining a clean, professional finish that can be painted immediately after use. Review: Really great to use to seal outside ducting - Great product for outside ducting. I had a new HVAC system put in, and I had to get new refrigerant lines put in as well. Metal cover/ducting was put over the lines down the side of the house. I wanted to better seal the bottom of the ducting. This product is like a sticky and slightly tougher playdoh. You can shape it, and pull pieces apart to fit any space. I suspect that this 1 lb unit can easily cover up to 1/2 square foot of space. Some advice: 1. Remove the internal plastic cover -- it's tricky, as it rips easily. I ended up with pieces of it embedded. 2. Use a knife to cut pieces off -- you can rip them off, but it does leave a ragged "edge" that needs to be re-shapped. Overall, great product for the price! Review: Stops pellets dead - I use this to line my pellet traps. I only shoot .177 and .22 cal so 3/4 of an inch is enough to stop the pellets dead in their tracks. (I always use a steel plate backer just in case). I have put 10s of 1000s of pellets into my current trap with not a single pass through, I got this pack to make an indoor trap and it has worked exactly as I intended. This putty sticks amazing and never slouches or releases from my backer. If your building an airguns- pellet trap this is the stuff you want. The only maintenance I do with this is once a year I pick out as many pellets I can and then re-flatten any areas that need it. It helps if it is warmer (the putty is easier to work) and I wear nitrile gloves but that's it for maintaining. ## Features - Air & Moisture Seal: Creates a durable barrier that blocks air leaks, moisture, dust, and drafts around electrical boxes, conduit, and wall penetrations - Permanently Soft & Easy to Mold: Putty-like consistency stays flexible over time-won't harden, crack, or shrink, making it easy to apply, remove, and rework as needed - Safe & Non-Corrosive: Formulated to be safe for use around plastics and metals-won't corrode wiring or damage surfaces - Multi-Surface Versatility: Adheres to metal, masonry, wood, and plastic for electrical, HVAC, plumbing, and general sealing applications - Paintable & Jobsite Ready: Can be painted immediately after application for a clean finish-suitable for visible installations - Weatherproof Protection: Provides reliable outdoor and indoor performance by preventing drafts and moisture intrusion through sealed penetrations - Convenient 1 lb Block Size: Comes in a ready-to-use 1 lb block format that provides ample material for multiple sealing projects and applications ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B003MZK122 | | Best Sellers Rank | #5,432 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #4 in HVAC Ducting | | Brand | Ideal Industries | | Brand Name | Ideal Industries | | Color | Black | | Compatible Material | Metal, Plastic, Rubber | | Customer Reviews | 4.7 out of 5 stars 731 Reviews | | Global Trade Identification Number | 00783250316014 | | Included Components | Duct Seal | | Item Dimensions | 8 x 4 x 2 inches | | Item Form | Putty | | Item Weight | 16 ounces | | Item dimensions L x W x H | 8 x 4 x 2 inches | | Manufacturer | IDEAL | | Material | Aluminum , Rubber | | Material Type | Aluminum, Rubber | | Model | 31-601 | | Number of Items | 1 | | Number of Packs | 1 | | Part Number | 31-601 | | Style | Compact | | Style Name | Compact | | Supported Standards | UL | | Surface Recommendation | Metal | | UPC | 013227238897 783250316014 | | Unit Count | 1 Count | | Water Resistance Level | Water Resistant | ## Product Details - **Brand:** Ideal Industries - **Item Weight:** 16 ounces - **Item dimensions L x W x H:** 8 x 4 x 2 inches - **Material:** Aluminum, Rubber - **Style:** Compact ## Images ![IDEAL Industries 31-601 Duct Seal Compound, 1 lb Block, Gray Putty for Sealing Junction Boxes, Service Entrances & HVAC Penetrations - Image 1](https://m.media-amazon.com/images/I/718Bc2LOwaL.jpg) ![IDEAL Industries 31-601 Duct Seal Compound, 1 lb Block, Gray Putty for Sealing Junction Boxes, Service Entrances & HVAC Penetrations - Image 2](https://m.media-amazon.com/images/I/614b6FdNhzL.jpg) ![IDEAL Industries 31-601 Duct Seal Compound, 1 lb Block, Gray Putty for Sealing Junction Boxes, Service Entrances & HVAC Penetrations - Image 3](https://m.media-amazon.com/images/I/614e+i+Cd9L.jpg) ![IDEAL Industries 31-601 Duct Seal Compound, 1 lb Block, Gray Putty for Sealing Junction Boxes, Service Entrances & HVAC Penetrations - Image 4](https://m.media-amazon.com/images/I/61tQVNGiU-L.jpg) ![IDEAL Industries 31-601 Duct Seal Compound, 1 lb Block, Gray Putty for Sealing Junction Boxes, Service Entrances & HVAC Penetrations - Image 5](https://m.media-amazon.com/images/I/71Czrtd0kiL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: does this have a adhesive on the back?** A: No, this is like play dough. You can mold it into anything. Hope this helps. **Q: can this be used in 3 in. PVC conduit service entrance coming out of the ground to block water coming through conduit and feeder wires to the meter?** A: Yes **Q: May we know if it has certified by Underwriter's Labotratories?** A: Yes it is, UL# R11734 **Q: could it be used to fill the gap between the skimmer body and pool concrete siding?** A: Sure.... It is for outdoor use ## Customer Reviews ### ⭐⭐⭐⭐⭐ Really great to use to seal outside ducting *by E***S on February 18, 2023* Great product for outside ducting. I had a new HVAC system put in, and I had to get new refrigerant lines put in as well. Metal cover/ducting was put over the lines down the side of the house. I wanted to better seal the bottom of the ducting. This product is like a sticky and slightly tougher playdoh. You can shape it, and pull pieces apart to fit any space. I suspect that this 1 lb unit can easily cover up to 1/2 square foot of space. Some advice: 1. Remove the internal plastic cover -- it's tricky, as it rips easily. I ended up with pieces of it embedded. 2. Use a knife to cut pieces off -- you can rip them off, but it does leave a ragged "edge" that needs to be re-shapped. Overall, great product for the price! ### ⭐⭐⭐⭐⭐ Stops pellets dead *by A***R on January 29, 2021* I use this to line my pellet traps. I only shoot .177 and .22 cal so 3/4 of an inch is enough to stop the pellets dead in their tracks. (I always use a steel plate backer just in case). I have put 10s of 1000s of pellets into my current trap with not a single pass through, I got this pack to make an indoor trap and it has worked exactly as I intended. This putty sticks amazing and never slouches or releases from my backer. If your building an airguns- pellet trap this is the stuff you want. The only maintenance I do with this is once a year I pick out as many pellets I can and then re-flatten any areas that need it. It helps if it is warmer (the putty is easier to work) and I wear nitrile gloves but that's it for maintaining. ### ⭐⭐⭐⭐⭐ Great item *by K***P on April 21, 2026* Great item ## Frequently Bought Together - Duct Seal 1 lb - 900 Moldable Silicone Putty - Black - Rectorseal 81880 1-Pound Duct Seal Compound Gray --- ## 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.gr/products/58747093-ideal-industries-31-601-duct-seal-compound-1-lb-block](https://www.desertcart.gr/products/58747093-ideal-industries-31-601-duct-seal-compound-1-lb-block) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-09-09*