---
product_id: 255417989
title: "ULTRA COPPER RTV GASKET MAKER NET.85g/ 3.OZ"
brand: "permatex"
price: "140 Lei"
currency: RON
in_stock: true
reviews_count: 6
category: "Permatex"
url: https://www.desertcart.ro/products/255417989-ultra-copper-rtv-gasket-maker-net-85g-3-oz
store_origin: RO
region: Romania
---

# 8x more flexible than cut gaskets Temp resistant up to 700°F Superior adhesion on oily metals ULTRA COPPER RTV GASKET MAKER NET.85g/ 3.OZ

**Brand:** permatex
**Price:** 140 Lei
**Availability:** ✅ In Stock

## Summary

> 🔥 Seal the heat, not your worries!

## Quick Answers

- **What is this?** ULTRA COPPER RTV GASKET MAKER NET.85g/ 3.OZ by permatex
- **How much does it cost?** 140 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/255417989-ultra-copper-rtv-gasket-maker-net-85g-3-oz)

## 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

- • **Vibration-Proof Seal:** Eight times more flexible than cut gaskets, maintaining integrity even in high-vibration environments.
- • **Sensor-Safe & Low Odor:** Non-corrosive formula that won’t interfere with sensitive engine sensors or produce harsh fumes.
- • **Oil-Resistant Powerhouse:** Three times more oil resistant than conventional silicones, ensuring long-lasting seals under pressure.
- • **Unmatched Heat Endurance:** Handles extreme temps from -65°F to 700°F intermittent, perfect for turbo and exhaust systems.
- • **Universal Fit, Professional Grade:** Designed for a wide range of automotive applications, trusted by pros for reliable, high-temp sealing.

## Overview

Permatex Ultra Copper RTV Gasket Maker is a high-temp silicone sealant engineered for extreme automotive conditions, offering superior adhesion, exceptional oil resistance, and flexibility. Rated for intermittent use up to 700°F, it’s ideal for turbochargers and exhaust systems, delivering professional-grade performance with sensor-safe, low-odor, and non-corrosive properties.

## Description

Permatex Ultra Copper is a high temperature RTV gasket maker, resisting temperatures up to 700°F (371°C). Ultra Copper is tested to exceed OEM specifications and is ideal for high temperature applications such as turbocharger applications and exhaust systems. For maximum performance, with the highest temperature resistance today up to 750°F (399°C) check out Permatex’s Optimum Red.

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: This is a product that I use for securing a muffler to a Saito engine and it never vibrates loose. Well pleased and many thanks.

## Features

- High-Temp Gasket Maker
- For high operating temperatures, turbocharger applications and exhaust systems
- Sensor-safe, low odor, non-corrosive
- Temperature range -65°F to 700°F (-54°C to 371°C) intermittent
- Resists auto and shop fluids and vibration
- Most Advanced, High Temp Rtv Silicone Gasket Available.Fit Type: Universal
- Three Times More Oil Resistant Than Conventional Silicones; Eight Times More Flexible Than Cut Gaske
- Sensor-Safe, Low Odor, And Non-Corrosive With Superior Adhesion
- Temperature Range -75F To 700F Intermittent

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002UEOPA |
| ASIN  | B0002UEOPA |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #12,260 in Automotive ( See Top 100 in Automotive ) #59 in Automotive Fillers, Adhesives & Sealants |
| Color | Black |
| Customer Reviews | 4.7 4.7 out of 5 stars (3,060) |
| Customer reviews | 4.7 4.7 out of 5 stars (3,060) |
| Date First Available | 3 August 2012 |
| Date First Available  | 3 August 2012 |
| Included components | silicone |
| Is Discontinued By Manufacturer  | Yes |
| Item Package Quantity | 1 |
| Item Weight | 85 g |
| Item model number | 81878 |
| Item model number  | 81878 |
| Item thickness | 1 Inches |
| Manufacturer | permatex |
| Manufacturer  | permatex |
| Material | Silicone |
| Part number | 81878 |
| Product Dimensions | 20.32 x 10.16 x 5.08 cm; 85 g |
| Product Dimensions  | 20.32 x 10.16 x 5.08 cm; 85 g |
| Size | 3 Ounce Tube |
| Special Features | Forms a superior bond on oil contaminated metals and maintains outstanding oil resistance |
| Style | Permatex 81878 Ultra Copper Gasket Maker Exhaust - 3.5 oz. |

## Product Details

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

## Images

![ULTRA COPPER RTV GASKET MAKER NET.85g/ 3.OZ - 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

### ⭐⭐ 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!

### ⭐⭐⭐⭐⭐ Review
*by A***Y on 25 January 2026*

This is a product that I use for securing a muffler to a Saito engine and it never vibrates loose. Well pleased and many thanks.

### ⭐⭐⭐⭐⭐ Review
*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!

## 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)

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-02-06*