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  • Permatex 81878  Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. Tube
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Permatex 81878 Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. Tube

| 6 answered questions

List Price: $7.50
Price: $6.22 & FREE Shipping
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Only 6 left in stock.
Ships from and sold by Shorts Marine Discount Parts.
3 Ounce Tube
  • 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
See more product details
89 new from $3.89

Frequently Bought Together

Permatex 81878  Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. Tube + Permatex 82180 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker, 3.35 oz. Tube
Price for both: $11.59

These items are shipped from and sold by different sellers.

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Product Information

Size: 3 Ounce Tube
Technical Details
BrandPermatex
Model81878
Item Weight3.2 ounces
Product Dimensions1.4 x 3.8 x 8 inches
Item model number81878
Discontinued by manufacturerYes
Exterior Smooth
Manufacturer Part Number81878
OEM Part Number 81878
ABPA Partslink Number 13
  
Technical Specification
Additional Information
ASINB0002UEOPA
Best Sellers Rank #527 in Automotive (See top 100)
Shipping Weight4 ounces (View shipping rates and policies)
ShippingThis item is also available for shipping to select countries outside the U.S.
Date First AvailableApril 1, 2004
  
Warranty & Support
Warranty, Parts: Parts
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Product Description

Size: 3 Ounce Tube

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.

Customer Questions & Answers

Customer Reviews

Works well for sealing exhaust leaks.
brian major
Works great as an adhesive too, as it dries to a strong rubber-like texture.
Smithsonite
Used it to make a good seal between exhaust pipes along with gaskets.
Jon

Most Helpful Customer Reviews

20 of 21 people found the following review helpful By Smithsonite on May 13, 2011
Size Name: 3 Ounce Tube Verified Purchase
Been using this stuff for over 15 years on everything from cars/trucks, to motorcycles, lawn equipment, & even the coal stove. Works great as an adhesive too, as it dries to a strong rubber-like texture. Needs a bit of time to cure, but once it does it forms a pretty strong bond. I once used it in place of the differential cover gasket in a '86 Grand Marquis - lasted over 6 years before it started weeping gear oil. The color is ugly, but the stuff works.
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7 of 7 people found the following review helpful By R. Bowlin on April 16, 2012
Size Name: 3 Ounce Tube Verified Purchase
I bought this to provide an added seal to the connection point of the FMF SST Gold Series pipe and the FMF Power Core 2 Silencer on my 2001 KX250 MX bike. I was getting a steady amount of burnt two-stroke oil dripping from the connection point and wanted a quick fix. I put a good bead of this silicone all around the connection point and let it dry overnight. By the next day it had set up nicely and was ready to go. As the other reviewer stated, it dried an ugly burnt orange color, but it sealed the leak 100%.
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7 of 8 people found the following review helpful By Dave78 on August 11, 2012
Size Name: 3 Ounce Tube Verified Purchase
Used this with a Rutland Inc Gasket Kit Tape 7'x5/8" 95-6 to replace the useless seal that my Large Big Green Egg came with. Just replaced the bottom seal only, removed the top seal completely. Worked fine and has held up over time with both high them searing and low temp smoking.
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4 of 5 people found the following review helpful By texan_176@yahoo.com on December 10, 2012
Size Name: 3 Ounce Tube Verified Purchase
I purchased this for a friend's Honda that was having major oil leakage from the distributor. The factory O-rings were replaced but the car would leak after only a few months again. The cylinder head is the location of the most hot part of an engine (the exhaust valve) and in this case the distributor shaft is pretty much spinning in scalding hot oil all of the time. Allowing it to cure overnight at a minimum is suggested if you have the time. The leak was gone and the liquid gasket was working well. I have also used this stuff as an exhaust paste on joints and to seal the manifold to the cylinder head. It stands up to heat very well. I would not hesitate to use it again.
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2 of 2 people found the following review helpful By opinions are like A_ _ holes on February 19, 2013
Size Name: 3 Ounce Tube Verified Purchase
as will most permatex products this is good stuff. it has a good high heat tolerance and stays where it is put.
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Size Name: 3 Ounce Tube Verified Purchase
I installed a new Exhaust System on my car and needed a good sealer for all the connections because I did not weld the connections. I tried Permatex's supposed exhaust putty and exhaust sealer which both failed quickly. They were supposed to withstand temperatures up to 2000F but after a few miles of driving both compounds cracked. I let the compounds cure for a couple days before running the vehicle so I know it wasn't a lack of cure time. I switch to this Ultra Copper silicone and so far it has outperformed the other exhaust sealers and was easier to work with. Don't get me wrong this stuff is still a little bit of a mess but is workable.
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1 of 1 people found the following review helpful By Andy on December 29, 2014
Size Name: 3 Ounce Tube Verified Purchase
Used this on my son's engine rebuild. Used it to hold the intake manifold gaskets in place and to replace the front and rear rubber seals. It takes a bit of time to cure, but once it does it forms a strong bond/seal. The color is burnt orange, so if you're building a show piece, be very careful and clean up the squeeze-out, as it WILL show against chrome, aluminum, etc. It has a good high heat tolerance and stays where you put it so you don't have to worry about it running/dripping.
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1 of 1 people found the following review helpful By JTH on April 25, 2012
Size Name: 3 Ounce Tube
Used this to seal up some prototype biomass furnaces. I applied it to a warm furnace and it worked fine.

I once used some cheap general purpose silicone for a high temperature application and it turned into a sticky mess that never cured. Must of had some weird fillers in it. Use the right material for the application.
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