--- product_id: 348637061 title: "Permatex 81878-12PK Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. (Pack of 12)" brand: "permatex" price: "938.28 DT" currency: TND in_stock: true reviews_count: 6 category: "Permatex" url: https://www.desertcart.tn/products/348637061-permatex-81878-12pk-ultra-copper-maximum-temperature-rtv-silicone-gasket store_origin: TN region: Tunisia --- # Temp range -75°F to 700°F 8x flexibility vs cut gaskets 3x oil resistance vs standard silicones Permatex 81878-12PK Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. (Pack of 12) **Brand:** permatex **Price:** 938.28 DT **Availability:** ✅ In Stock ## Summary > 🔥 Seal the deal with ultra copper strength — don’t let your engine miss out! ## Quick Answers - **What is this?** Permatex 81878-12PK Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. (Pack of 12) by permatex - **How much does it cost?** 938.28 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/348637061-permatex-81878-12pk-ultra-copper-maximum-temperature-rtv-silicone-gasket) ## Best For - permatex enthusiasts ## Why This Product - Trusted permatex brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Extreme Heat Warrior:** Handles scorching temps up to 700°F intermittent for turbocharged and high-performance engines. - • **Flexibility That Lasts:** Eight times more flexible than cut gaskets to absorb vibration and prevent leaks. - • **Sensor-Safe & Low Odor:** Non-corrosive formula protects sensitive engine sensors while keeping your workspace fresh. - • **Oil-Resistant Powerhouse:** Triple the oil resistance of conventional silicones keeps seals intact under harsh fluids. - • **Superior Adhesion & Durability:** Copper-infused silicone ensures a rock-solid seal on exhausts, valve covers, and more. ## Overview Permatex Ultra Copper RTV Silicone Gasket Maker is a professional-grade, high-temperature sealant designed for automotive applications. With a temperature tolerance from -75°F to 700°F intermittent, it offers superior oil resistance and flexibility, making it ideal for exhaust manifolds, valve covers, and other engine components. Its sensor-safe, low-odor, and non-corrosive formula ensures reliable adhesion and long-lasting performance in demanding environments. ## Description Permatex Ultra Copper Maximum Temperature RTV Silicone Gasket Maker is the most advanced, high temp RTV silicone gasket available. Three times more oil resistant than conventional silicones and eight times more flexible than cut gaskets, it is sensor-safe, low odor, and non-corrosive with superior adhesion. Highest operating temperatures for 4-cylinder, turbocharged or high-performance engines and OEM specified, with a temperature range of -75 degrees fahrenheit to 700 degrees fahrenheit intermittent. Also resists auto and shop fluids and vibration. These gasket makers offer significant performance advantages, excellent torque retention and hi-temp, sensor-safe properties. Extended warranties, engine sensors and new component materials such as aluminum, bi-metal alloys and high-tech plastics, have created the need for superior RTV silicone gasket makers in both OEM production and service applications. Permatex always has the right gasket maker for your application. Review: Do NOT apply on your exhaust flanges - My heart is still pounding as I was rushing in all directions trying to get something to extinguish the fire with. I applied this RTV on the collector flange, downstream the headers, to arrest a leak and correct the AFR reading on the wideband. I saw some smoke, and I thought maybe it's the high temp paint on the header. Next I saw flames, and you know the rest. Beware, for your own safety! Review: excelente en las uniones del escape de mi motocicleta - Este sellador de silicona de alta temperatura ha funcionado de manera excelente en las uniones del escape de mi motocicleta. Su resistencia al calor extremo garantiza un sellado duradero sin deteriorarse con el tiempo. La aplicación es sencilla y la adherencia es muy buena, asegurando que no haya fugas ni vibraciones molestas en las conexiones. Además, su formulación a base de cobre proporciona una excelente conductividad térmica y estabilidad en condiciones exigentes. En general, un producto confiable y altamente recomendable para sellar uniones expuestas a altas temperaturas, como sistemas de escape y componentes de motor. ¡Gran desempeño! ## Features - Most advanced, high temp RTV silicone gasket available - Three times more oil resistant than conventional silicones; eight times more flexible than cut gaskets - Sensor-safe, low odor, and non-corrosive with superior adhesion - Temperature range -75F to 700F intermittent - Suggested Applications: Exhaust manifolds/headers, valve covers, oil pans, timing covers, water pumps, thermostat housings ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B001REZA1W | | Best Sellers Rank | #4,448 in Automotive ( See Top 100 in Automotive ) #37 in Automotive Fillers, Adhesives & Sealants #3,776 in Oils & Fluids | | Brand | Permatex | | Brand Name | Permatex | | Color | Copper | | Colour | Copper | | Customer Reviews | 4.7 out of 5 stars 3,297 Reviews | | Global Trade Identification Number | 30686226818783 | | Included Components | Tube of Gasket Maker | | Item Form | Liquid | | Item Weight | 2.88 Pounds | | Item form | Liquid | | Item weight | 2.88 Pounds | | Liquid Volume | 3 Fluid Ounces | | Liquid volume | 3 Fluid Ounces | | Manufacturer | Permatex | | Material Type | Silicone | | Model | 81878-12PK | | Number of Items | 12 | | Part Number | 81878-12PK | | Surface Recommendation | Pipe | | Surface recommendation | Pipe | | Unit Count | 12 Count | ## Product Details - **Brand:** Permatex - **Colour:** Copper - **Item form:** Liquid - **Item weight:** 1.31 kg - **Liquid volume:** 3 Fluid Ounces ## Images ![Permatex 81878-12PK Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. (Pack of 12) - Image 1](https://m.media-amazon.com/images/I/81PxU8Ql4PL.jpg) ![Permatex 81878-12PK Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. (Pack of 12) - Image 2](https://m.media-amazon.com/images/I/81u1kGuxI+L.jpg) ![Permatex 81878-12PK Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. (Pack of 12) - Image 3](https://m.media-amazon.com/images/I/61leGRet8qL.jpg) ![Permatex 81878-12PK Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. (Pack of 12) - Image 4](https://m.media-amazon.com/images/I/71eou1YAKvL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐ Do NOT apply on your exhaust flanges *by A***N on 3 March 2023* My heart is still pounding as I was rushing in all directions trying to get something to extinguish the fire with. I applied this RTV on the collector flange, downstream the headers, to arrest a leak and correct the AFR reading on the wideband. I saw some smoke, and I thought maybe it's the high temp paint on the header. Next I saw flames, and you know the rest. Beware, for your own safety! ### ⭐⭐⭐⭐⭐ excelente en las uniones del escape de mi motocicleta *by E***O on 5 February 2025* Este sellador de silicona de alta temperatura ha funcionado de manera excelente en las uniones del escape de mi motocicleta. Su resistencia al calor extremo garantiza un sellado duradero sin deteriorarse con el tiempo. La aplicación es sencilla y la adherencia es muy buena, asegurando que no haya fugas ni vibraciones molestas en las conexiones. Además, su formulación a base de cobre proporciona una excelente conductividad térmica y estabilidad en condiciones exigentes. En general, un producto confiable y altamente recomendable para sellar uniones expuestas a altas temperaturas, como sistemas de escape y componentes de motor. ¡Gran desempeño! ### ⭐⭐⭐⭐⭐ Sehr gutes Produkt *by L***L on 11 January 2026* Sehr gutes Produkt. ## Frequently Bought Together - Permatex 81878-12PK Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. (Pack of 12) - Permatex 82180-12PK Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker, 3 oz. Tube (Pack of 12) - Permatex 82194-12PK Ultra Grey Rigid High-Torque RTV Silicone Gasket Maker, 3 Ounce (Pack of 12) --- ## 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.tn/products/348637061-permatex-81878-12pk-ultra-copper-maximum-temperature-rtv-silicone-gasket](https://www.desertcart.tn/products/348637061-permatex-81878-12pk-ultra-copper-maximum-temperature-rtv-silicone-gasket) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-09-02*