---
product_id: 50081863
title: "S/S Permatex - Ultra Copper - RTV Silicone Gasket Maker - Exhausts to 700oF - 85g"
brand: "permatex"
price: "$33.91"
currency: USD
in_stock: true
reviews_count: 13
category: "Permatex"
url: https://www.desertcart.us/products/50081863-s-s-permatex-ultra-copper-rtv-silicone-gasket-maker-exhausts
store_origin: US
region: United States of America
---

# Withstands up to 700°F 8x more flexible than cut joints 3x more oil-resistant than standard silicones S/S Permatex - Ultra Copper - RTV Silicone Gasket Maker - Exhausts to 700oF - 85g

**Brand:** permatex
**Price:** $33.91
**Availability:** ✅ In Stock

## Summary

> 🔥 Seal the deal with Ultra Copper – where performance meets precision!

## Quick Answers

- **What is this?** S/S Permatex - Ultra Copper - RTV Silicone Gasket Maker - Exhausts to 700oF - 85g by permatex
- **How much does it cost?** $33.91 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/50081863-s-s-permatex-ultra-copper-rtv-silicone-gasket-maker-exhausts)

## 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

- • **Oil & Fluid Armor:** Triple the oil resistance ensures long-lasting protection against automotive fluids and vibrations.
- • **Pro-Grade Adhesion:** Superior bonding power for reliable torque retention and leak-proof performance on high-tech engine components.
- • **Sensor-Safe Formula:** Non-corrosive and low odor, perfectly compatible with modern engine sensors and electronics.
- • **Extreme Heat Defense:** Keeps your engine sealed under scorching conditions up to 700°F intermittent.
- • **Unmatched Flexibility:** Eight times more flexible than traditional gasket materials to prevent cracks and leaks.

## Overview

Permatex Ultra Copper RTV Silicone Gasket Maker is a professional-grade, high-temperature silicone sealant designed for automotive exhausts and engines. It withstands extreme temperatures up to 700°F, offers superior flexibility and oil resistance, and is sensor-safe with low odor and non-corrosive properties. Trusted by mechanics and enthusiasts alike, it ensures durable, leak-proof seals on modern high-performance engines and components.

## Description

Permatex Ultra Copper Maximum Temperature RTV Silicket Gasket Maker is the most advanced and high temperature RTV silicone gasket available. Three times more oil-resistant than conventional silicones and eight times more flexible than cut joints, it is sensor safe, has low odor, and is non-corrosive with superior adhesion. Higher operating temperatures for 4-cylinder, turbocharged or high-performance and OEM-specified engines, with a temperature range of -75 degrees Fahrenheit to 700 degrees Fahrenheit intermittent. It also resists auto and workshop fluids and vibrations. These gasket manufacturers offer significant performance advantages, excellent torque retention and high temperature properties and safe sensors. Extended warranties, engine sensors, and new component materials, such as aluminum, bimetallic alloys, and high-tech plastics, have created the need for superior RTV silicone gasket manufacturers in OEM production and service applications. Permatex always has the right gasket manufacturer for your application.

Review: Does the job - Does what it says, easy to use and no issues
Review: No more leaks! - I had constant issues stopping my motorbike exhaust from leaking and losing back pressure but this stuff is brilliant! Much better than other exhaust sealing compounds which go hard, brittle and fall out after a few hundred miles. Very impressed!

## Features

- Causes serious eye irritation.
- May cause an allergic skin reaction.
- Suspected of causing cancer.
- Most advanced, high temp RTV silicone gasket available

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002UEOPA |
| Best Sellers Rank | 5,299 in Automotive ( See Top 100 in Automotive ) 73 in Fillers, Adhesives & Sealants |
| Brand | Permatex |
| Colour | Copper |
| Customer Reviews | 4.7 4.7 out of 5 stars (3,030) |
| Date First Available | 16 Aug. 2010 |
| Item Weight | 85 g |
| Material | Silicone |
| Model Number | 81878 |
| Product Dimensions | 20.32 x 10.16 x 5.08 cm; 85 g |

## Product Details

- **Brand:** Permatex
- **Colour:** Copper
- **Full cure time:** 24 Hours
- **Item weight:** 85 Grams
- **Liquid volume:** 3000 Millilitres

## Images

![S/S Permatex - Ultra Copper - RTV Silicone Gasket Maker - Exhausts to 700oF - 85g - Image 1](https://m.media-amazon.com/images/I/81freAdVPGL.jpg)

## Questions & Answers

**Q: Can this be used on a valve cover gasket to get a better seal?**
A: Yes.  It is better than OEM gaskets in that it conforms to any warpage, dents, dings, & other incongruities, whereas OEM gaskets are designed for factory new, perfect valve covers without flaws.  Withstands 700 degrees.

**Q: Can I use this product to seal several non-moving parts of a wood burning stove instead of the standard gasketing material?**
A: This gasketting goop is absolutely incredible for sealing wood stove parts.  I’d certainly never use it on the fire box.  But it can and will hold to moving parts in high temperatures.  It lasts for several years on one application.

**Q: can I use this to seal radiator tubes to a heat exchanger in my gas furnace? Gaskets no longer available for it.**
A: Greetings! As I don't know this application, specifically, I can say that say that Ultra Copper is excellent for sealing liquid coolant surfaces in truck/auto repairs. Temperature, up to about 800*F and pressures exceeding 15 psi will remain sealed with this product. U.C. remains a pliant sealing silicone "glue", but it won't harden, as epoxy does. If you need a sealer that also hastens, look elsewhere. If this is for a flange or any flat, secured surface, you're good-to-go. NO acetic acid in this product, if that's a plus for you.

**Q: Can I spread this on outside of exhaust manifold leak like you would caulk something or does it have to go between parts?  F150 '04 V8**
A: It is too much pressure and heat to use any caulk or rtv. Even muffler cement doesn't work. You might have a lean fuel mixture to cause the problem in he first place. Exhaust bolts rust solid from heat erosion, use the right amount of points on the socket to get bolts out(6 sided bolt--6 sided socket) Copper metal exhaust gaskets work well. Mr. Gasket brand.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Does the job
*by B***C on 3 January 2026*

Does what it says, easy to use and no issues

### ⭐⭐⭐⭐⭐ No more leaks!
*by S***G on 3 October 2025*

I had constant issues stopping my motorbike exhaust from leaking and losing back pressure but this stuff is brilliant! Much better than other exhaust sealing compounds which go hard, brittle and fall out after a few hundred miles. Very impressed!

### ⭐⭐⭐⭐⭐ Perfect
*by M***X on 12 October 2025*

Excellent for sealing up exhausts

## Frequently Bought Together

- Permatex 81878 Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. Tube
- J-B Weld 37901 ExtremeHeat High Temperature Resistant Metallic Paste - 3 oz
- Permatex 80335 Muffler and Tailpipe Sealer, 3 oz., Plastic, 1 Count (Pack of 1)

---

## 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/50081863-s-s-permatex-ultra-copper-rtv-silicone-gasket-maker-exhausts](https://www.desertcart.us/products/50081863-s-s-permatex-ultra-copper-rtv-silicone-gasket-maker-exhausts)

---

*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-03-02*