--- product_id: 3334226 title: "Permatex 81878-12PK Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. (Pack of 12)" brand: "permatex" price: "$254.23" currency: USD in_stock: true category: "Permatex" url: https://www.desertcart.us/products/3334226-permatex-81878-12pk-ultra-copper-maximum-temperature-rtv-silicone-gasket store_origin: US region: United States of America --- # Temp range -75°F to 700°F 8x more flexible than cut gaskets 3x oil resistant vs. standard silicones Permatex 81878-12PK Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. (Pack of 12) **Brand:** permatex **Price:** $254.23 **Availability:** ✅ In Stock ## Summary > 🔥 Seal the deal with ultra-copper strength – your engine’s new best friend! ## 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?** $254.23 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/3334226-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 - • **Flexibility That Lasts:** Eight times more flexible than traditional gaskets, ensuring durable, vibration-resistant seals. - • **Sensor-Safe & Low Odor:** Formulated to protect sensitive engine sensors while maintaining a low-odor, non-corrosive profile. - • **Superior Oil Resistance:** Triple the oil resistance of conventional silicones keeps seals intact under harsh conditions. - • **Unmatched Heat Endurance:** Handles extreme temps up to 700°F intermittent for turbocharged and high-performance engines. - • **Versatile Application Power:** Perfect for exhaust manifolds, valve covers, oil pans, and more—trusted by OEMs and pros alike. ## Overview Permatex Ultra Copper RTV Silicone Gasket Maker delivers industry-leading heat resistance (-75°F to 700°F), exceptional oil resistance, and superior flexibility. Sensor-safe and low odor, this copper-colored gasket maker is engineered for high-performance engines and OEM applications, providing durable, vibration-resistant seals across a wide range of automotive parts. ## 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. ## 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 | #2,133 in Automotive ( See Top 100 in Automotive ) #6 in Gasket Sealers | | Brand Name | Permatex | | Color | Copper | | Customer Reviews | 4.8 4.8 out of 5 stars (29) | | Included Components | Tube of Gasket Maker | | Item Form | Paste | | Item Weight | 2.9 pounds | | Liquid Volume | 3 fluid ounces | | Manufacturer | Permatex | | Material Type | copper | | Model | 81878-12PK | | Number of Items | 12 | | Part Number | 81878-12PK | | Surface Recommendation | Miscellaneous | | Unit Count | 36 Fluid Ounces | | Water Resistance Level | Waterproof | ## Product Details - **Brand:** Permatex - **Color:** Copper - **Item Form:** Paste - **Item Weight:** 2.9 pounds - **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. ## 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.us/products/3334226-permatex-81878-12pk-ultra-copper-maximum-temperature-rtv-silicone-gasket](https://www.desertcart.us/products/3334226-permatex-81878-12pk-ultra-copper-maximum-temperature-rtv-silicone-gasket) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-14*