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Item #:
3806511
Permatex 81878 Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. Tube
Item #:
3806511
MWK 342233
Price Details
Excluding Shipping & Custom charges ( Shipping and custom charges will be calculated on checkout )
*All items will import from US
In stock
Imported from USA store
QTY:
Order now and get it around Sunday, August 02
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Permatex Ultra Copper Maximum Temperature RTV Silicone Gasket Maker is the most advanced, high temp RTV silicone gasket available.
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What Stands Out
High-Temperature Resistance
Withstands extreme temperatures up to 700°F, ensuring durability and reliability in high-heat applications, making it ideal for automotive and industrial uses.
Versatile Application
Perfect for various uses, including engine components, exhaust systems, and transmission cases, providing a strong seal that prevents leaks and enhances performance.
Easy Application
The convenient 3 oz. tube allows for precise application, reducing mess and waste, making it user-friendly for both professionals and DIY enthusiasts.
Product Details
- Most advanced, high temp RTV silicone gasket
- Three times more oil resistant than conventional silicones
- Eight times more flexible than cut gaskets
- Sensor-safe, low odor, non-corrosive with superior adhesion
- Temperature range -75°F to 700°F intermittent
- Designed for high operating temperatures, turbocharger applications, and exhaust systems
Product Technical Details
| Manufacturer | PERMTX-LOCKT |
| Brand | Permatex |
| Model | Permatex 81878 |
| Item Weight | 3 ounces |
| Product Dimensions | 8 x 4 x 2 inches |
| Item model number | 81878 |
| Is Discontinued By Manufacturer | Yes |
| Exterior | Painted |
| Manufacturer Part Number | 81878 |
| OEM Part Number | PMT81878 |
| Special Features | Forms a superior bond on oil contaminated metals and maintains outstanding oil resistance |
| National Stock Number | 8030-01-598-1435 |
What's in the box
Permatex 81878
Who Should Buy?
-
Automotive Enthusiasts
Ideal for car maintenance and repairs, providing a reliable seal for engine components under high temperatures.
-
DIY Mechanics
Great for home mechanics needing a durable gasket solution for various automotive or machinery applications.
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High-Temperature Applications
Suitable for areas subjected to extreme heat, such as exhaust systems and high-temp engine components.
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Low-Temperature Use
Not suitable for applications that operate at low temperatures where a flexible seal isn't required.
Product Description
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Customer Questions & Answers
-
Question:
What is Permatex 81878 Ultra Copper Maximum Temperature RTV Silicone Gasket Maker used for?
Answer: Permatex 81878 Ultra Copper is designed for creating high-performance gaskets in automotive and industrial applications. It can withstand extreme temperatures, making it ideal for valve covers, oil pans, and exhaust systems. The RTV formula cures quickly to offer a reliable seal that resists oil and antifreeze damage, ensuring long-lasting performance. It's especially useful in high-temperature areas, providing a dependable bond under pressure, and can be used for both original equipment and repair purposes. -
Question:
How do I apply Permatex 81878 Ultra Copper?
Answer: To apply Permatex 81878 Ultra Copper, start with clean, dry surfaces. Squeeze the tube to apply an even bead of silicone to one surface, ensuring it fills any gaps correctly. For best results, assemble the parts within 15 minutes, allowing the silicone to cure effectively under compression. This product is perfect for metal to metal applications, providing an effective seal for oil leaks and engine repairs. Make sure the parts are held securely together while the silicone cures for optimal results. -
Question:
Is Permatex 81878 Ultra Copper suitable for all automotive applications?
Answer: While Permatex 81878 Ultra Copper is versatile and suitable for many automotive applications, it's important to note that it's specifically designed for high-temperature and high-stress environments. It is excellent for gaskets exposed to extreme heat, such as those in engines. However, it's not recommended for use on all plastic parts or components that experience constant flexing. Always check the compatibility of the materials in your specific application to ensure the best results and longevity. -
Question:
What temperature range can Permatex 81878 Ultra Copper withstand?
Answer: Permatex 81878 Ultra Copper can withstand temperatures from -75°F to 500°F (-59°C to 260°C) intermittently. This impressive temperature range makes it ideal for high-performance automotive gaskets and engine parts that encounter significant heat stress. Its ability to maintain a strong seal under such conditions helps prevent leaks in critical components, ensuring your vehicle runs smoothly and efficiently without the risk of gasket failure. -
Question:
Can I use Permatex 81878 Ultra Copper on metal surfaces?
Answer: Yes, Permatex 81878 Ultra Copper is designed specifically for use on metal surfaces. It effectively seals and bonds metal components, providing a durable and high-temperature resistant gasket solution. The RTV silicone is formulated to fill imperfections and gaps between metal surfaces, making it ideal for mounting surfaces in engine applications, such as intake and exhaust systems. Always ensure that the metal surfaces are cleaned and free from old gasket material or oil before application for optimal adhesion. -
Question:
How long does it take for Permatex 81878 Ultra Copper to cure?
Answer: Permatex 81878 Ultra Copper typically begins to skin over within 1 hour, and it should fully cure in about 24 hours depending on ambient temperature and humidity levels. For maximum effectiveness, it's advisable to avoid disturbing the bond during the curing period. This fast-drying property makes it convenient for quick repairs, allowing you to complete your projects without long wait times, while still achieving a robust seal in high-stress areas of your vehicle. -
Question:
Is Permatex 81878 Ultra Copper resistant to chemicals?
Answer: Yes, Permatex 81878 Ultra Copper is resistant to a wide range of automotive fluids including oil, coolant, and transmission fluids. This chemical resistance ensures that the silicone retains its integrity and does not break down when exposed to harsh substances, maintaining a tight seal that prevents leaks. This feature is especially useful in high-performance environments where exposure to various chemicals is common, ensuring your repairs remain effective over time. -
Question:
What is the consistency of Permatex 81878 Ultra Copper?
Answer: Permatex 81878 Ultra Copper has a medium viscosity similar to that of a paste, which makes it easy to apply precisely where needed. This consistency ensures it can fill gaps effectively without running or dripping, making it ideal for vertical applications. Its thick formulation helps to prevent squeeze-out, making it ideal for ensuring a strong seal even in challenging positions under the hood. -
Question:
How can I remove Permatex 81878 Ultra Copper after it has cured?
Answer: After curing, Permatex 81878 Ultra Copper can be tough to remove, as it forms a strong bond. Use a gasket scraper or a razor blade to carefully scrape away the silicone from the surfaces. Soaking the area with mineral spirits or a silicone remover can help soften the material, making it easier to remove. Always be cautious during this process to avoid damaging the underlying surfaces, and ensure they are clean and free of any residue before applying a new gasket. -
Question:
Where can I buy Permatex 81878 Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. Tube?
Answer: You can buy Permatex 81878 Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. Tube at Ubuy in Malawi. Ubuy offers a variety of automotive products, ensuring you can find the right tools and materials for your vehicle maintenance needs. Their platform provides a straightforward shopping experience, making it easy to find this essential gasket maker for your project.
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Last Updated on Juillet 18, 2026
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MWK 342233
Order now and get it around Sunday, August 02
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Features & Benefits
- Three times more oil resistant than conventional silicones and eight times more flexible than cut gaskets
- Sensor-safe, low odor, and non-corrosive with superior adhesion
- Highest operating temperatures for 4-cylinder, turbocharged or high-performance engines
- Resists auto and shop fluids and vibration
- Excellent torque retention and hi-temp, sensor-safe properties
- Fit Type: Universal
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