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

4.7 out of 5 stars 198 customer reviews
| 21 answered questions

Price: $6.74 & FREE Shipping on orders over $49. Details
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3 Ounce Tube
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  • Resistant To Oil & Acid
  • Easy to use
  • This product is manufactured in China
  • 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

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Frequently Bought Together

  • Permatex 81878  Ultra Copper Maximum Temperature RTV Silicone Gasket Maker, 3 oz. Tube
  • +
  • 1 Mil Kapton Tape (Polyimide) - 1/2" X 36 Yds
Total price: $14.29
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Product Information

Size:3 Ounce Tube

Technical Details

Brand Permatex
Model 81878
Item Weight 3.2 ounces
Product Dimensions 1.4 x 3.8 x 8 inches
Item model number 81878
Discontinued by manufacturer Yes
Manufacturer Part Number 81878
OEM Part Number PMT81878
ABPA Partslink Number 13
Folding No
National Stock Number 8030-01-598-1435

Technical Specification

Additional Information

ASIN B0002UEOPA
Customer Reviews
4.7 out of 5 stars 198 customer reviews

4.7 out of 5 stars
Best Sellers Rank #2,467 in Automotive (See top 100)
#2 in Automotive > Oils & Fluids > Sealers > Gasket
#3 in Industrial & Scientific > Tapes, Adhesives & Sealants > Industrial Sealants > Gasket Sealants > Gasket Makers
Shipping Weight 3.8 ounces (View shipping rates and policies)
Date First Available April 1, 2004

Warranty & Support

Warranty, Parts:PartsWarranty, Labor:Full Manufacturer's Warranty - Sold by Authorized Reseller

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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

Top Customer Reviews

Size: 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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Size: 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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Size: 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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By Andy on December 29, 2014
Size: 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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Size: 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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Size: 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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Size: 3 Ounce Tube Verified Purchase
With this, I was able to seal the connection between my homemade exhaust pipe, and the gasoline generator itself. The generator muffler terminates in a simple pipe extension, so I got some flexible metal tubing, wrapped it with exhaust repair to make it fume-tight, and then put a thick layer of this goo around the muffler vent, pushed my exhaust pipe over it so it "cushioned" the tube and formed a ring around the exposed end, and let it cure for a day. I drilled it, put a little more product in the hole, and inserted a metal self-tapping screw to fix the new "tailpipe" in place.

I'd run the tailpipe through the wall, through a high-heat-insulated 3" hole I'd drilled to the outdoors, and lined with a section of heavy duty metal pipe.

Now I can run my gas generator in the garage, and this gasket material helped make my exhaust system fume-free.

It works great at high heat!

Recommended.
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Size: 3 Ounce Tube Verified Purchase
I was leery but this stuff is unreal. I've used epoxies for years but mostly on wood, broken pieces of dish-ware and plastics...never to repair spot welds that came undone on metal. Specifically, I needed a to fix my SmokeWare vent cap to our ceramic smoker. I dropped the metal, vent cap on my deck and 2 of 3 spot welds broke loose. Friends on a blog said Ultra Copper is what you need. Worked like a charm! Back in business!
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