[DHeal]

Does anyone out there in RV-12-land know why Van's specifies a "copper-free" anti-seize paste for use on the RV-12 exhaust system connections? Is there some inherent metalugical or wear issue between copper and the exhaust components?

I already have some Loctite "Copper-Free" Heavy-Duty Anti-Seize on order, but was curious as to why something like Loctite C5-A "Copper-Based" Anti-seize is not acceptable?

 

[gasman]

You might find your answer in here..... http://www.actechbooks.com/products/act427/

 

[Alex Edwards]

I dont know what metal the exhaust is made from but my guess is Galvanic corrosion. The copper will cause the aluminium to corrode.

 

[Dave12]

Mine appears to be made of Stainless.

 

[N690RV's Dad]

I think that sometimes the copper causes galling on the threads when taking certain things apart.

 

[az_gila]

If it's going directly on an exhaust system, you might consider this nickel one, specifically made for stainless steel.

Good to 2400 F instead of the 1600 F of the standard ones -

http://www.permatex.com/component/d...rmat=raw&filename=77124.pdf&market=automotive

Any good auto supply place will have it or be able to order it.

 

[RFSchaller]

I'm not a metallurgist, but I know stainless is susceptible to corrosion and cracking when contaminated by some metals. That's why welders never use carbon steel wire brushes on stainless.

 

[SHIPCHIEF]

Stainless steel has some great properties, as well as some not so great ones. It's subject to crevice (pit) corrosion, has poor machinability due to a tendency to gall, and is not as strong as plain steel.
It does have corrosion resistance at elevated temp as compared to plain steel, so won't rust out like a plain steel exhaust.