---
product_id: 3334226
title: "Permatex 81878-12PK Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. (Pack of 12)"
brand: "permatex"
price: "719.73 DT"
currency: TND
in_stock: true
reviews_count: 8
category: "Permatex"
url: https://www.desertcart.tn/products/3334226-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:** 719.73 DT
**Availability:** ✅ In Stock

## Summary

> 🔥 Seal the deal with ultra-copper power – your engine’s hottest 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?** 719.73 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/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

- • **Next-Level Flexibility:** Eight times more flexible than traditional cut gaskets, adapting seamlessly to engine vibrations and movements.
- • **Sensor-Safe & Low Odor:** Formulated to protect sensitive engine sensors while keeping your workspace fresh and non-corrosive.
- • **Superior Oil Resistance:** Three times more oil resistant than conventional silicones, ensuring long-lasting seals under harsh conditions.
- • **Unmatched Heat Endurance:** Handles extreme temps up to 700°F intermittent—perfect for turbocharged engines and high-performance rides.
- • **Versatile High-Performance Sealant:** Ideal for exhaust manifolds, valve covers, oil pans, and more—trusted by pros for OEM-level reliability.

## Overview

Permatex Ultra Copper RTV Silicone Gasket Maker delivers industry-leading heat resistance (-75°F to 700°F intermittent), exceptional oil resistance, and superior flexibility. Sensor-safe and low odor, this copper-colored paste is engineered for high-performance automotive applications including exhaust manifolds, valve covers, and oil pans. Trusted by professionals and backed by thousands of 5-star reviews, it ensures durable, vibration-resistant seals that meet OEM standards.

## 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: Worked for furnace ducts - Working well on some ducting coming into and off of my furnace
Review: Great product - Use on exhaust or anyplace else you need a seal for extended high heat use!

## 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 | #1,934 in Automotive ( See Top 100 in Automotive ) #5 in Gasket Sealers |
| Brand | Permatex |
| Brand Name | Permatex |
| Color | Copper |
| Customer Reviews | 4.7 out of 5 stars 3,171 Reviews |
| Global Trade Identification Number | 30686226818783 |
| Included Components | Tube of Gasket Maker |
| Item Form | Paste |
| Item Height | 4.3 inches |
| Item Weight | 2.88 Pounds |
| Liquid Volume | 3 Fluid Ounces |
| Manufacturer | Permatex |
| Material Type | copper |
| Surface Recommendation | Miscellaneous |
| Unit Count | 36.0 Fluid Ounces |
| Water Resistance Level | Waterproof |

## Product Details

- **Color:** Copper
- **Brand:** Permatex
- **Item Weight:** 2.9 Pounds
- **Liquid Volume:** 3 Fluid Ounces
- **Item Form:** Paste

## 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/61leGRet8qL.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/71eou1YAKvL.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/81PxU8Ql4PL.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/81u1kGuxI+L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Worked for furnace ducts
*by N***E on December 4, 2025*

Working well on some ducting coming into and off of my furnace

### ⭐⭐⭐⭐⭐ Great product
*by P***D on December 29, 2025*

Use on exhaust or anyplace else you need a seal for extended high heat use!

### ⭐⭐⭐⭐⭐ The Only RTV for High-Heat Engine Jobs
*by M***N on October 11, 2025*

If you're working on anything high-heat, like an exhaust manifold or turbo application, this is the only gasket maker to use. The Ultra Copper RTV is a workhorse—it handles maximum temperatures without breaking down, shrinking, or leaking. It goes on smoothly, cures quickly, and forms a super durable, tight seal. I've used it on headers where standard RTV would just burn up, and this holds strong. It's the professional choice for reliability under extreme heat. Essential for engine work.

## Frequently Bought Together

- Permatex 81878-12PK Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. (Pack of 12)
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- Permatex 82194-12PK Ultra Grey Rigid High-Torque RTV Silicone Gasket Maker, 3 Ounce (Pack of 12)

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*Product available on Desertcart Tunisia*
*Store origin: TN*
*Last updated: 2026-01-23*