Brass or Copper Tubing??????????????????????

[Robert Zambelli]

This is a brand new piece of 1/8 inch brass tubing that I had in stock.

The photo tells it all.

   Bob Z.

[Brad Smith]

Nice piece off scrap BOB.

[Larry Fernandez]

Thanks for the post Bob.
A few weeks back I asked a question about this and Dirty Dan called me a "Wanker"

Larry, Buttafucco Stunt Team

[Garf]

Here is what I found when I took a tank apart.

[Russell Shaffer]

I've been getting 1/8 OD copper tube from an auto parts store.  It is on a roll and they sell it by the foot, about $1 as I recall.  It has a thicker wall and doesn't kink when bending. 

[Warren Wagner]

And here's another example of the strange behavior of BRASS tubing.

This is a "feed-thru" for the top of a gallon fuel bottle, but the interesting thing
here, is that the worst breakdowns are where the brass tubing is in contact with
the VAPORS from the fuel, not the direct liquid fuel.

Any chemists here that can explain this behavior???  Could it be the close
proximity to the interface between the brass and the lead/tin solder used to
fabricate the fittings?
 
Cheers.

Warren Wagner

[Garf]

I've been getting 1/8 OD copper tube from an auto parts store.  It is on a roll and they sell it by the foot, about $1 as I recall.  It has a thicker wall and doesn't kink when bending. 

This would be intended for use on auto A/C units.

[ChrisSarnowski]

How do you say "wanker" in Chinese or Pakistani?

[Brett Buck]

And here's another example of the strange behavior of BRASS tubing.

This is a "feed-thru" for the top of a gallon fuel bottle, but the interesting thing
here, is that the worst breakdowns are where the brass tubing is in contact with
the VAPORS from the fuel, not the direct liquid fuel.

Any chemists here that can explain this behavior???  Could it be the close
proximity to the interface between the brass and the lead/tin solder used to
fabricate the fittings?

    No, because I had pretty much the same thing happen with no solder.

    The theory has always been that the zinc gets leached out of the brass, leaving a spongy and brittle copper matrix that then breaks easily. I don't know the chemistry.

    Brett


p.s. As always, wikipedia to the rescue:

"Leaching of zinc
"DZR" redirects here. For the jujutsu school, see Danzan-ryū.

The most common example is selective leaching of zinc from brass alloys containing more than 15% zinc (dezincification) in presence of oxygen and moisture, eg. from brass taps in chlorine-containing water. It is believed that both copper and zinc gradually dissolved out simultaneously and copper precipitates back from the solution. The material remaining is a copper-rich sponge with poor mechanical properties, and color changed from yellow to red. Dezincification can be caused by water containing sulfur, carbon dioxide and oxygen. Stagnant or low velocity waters tend to promote dezincification."

   The oxygen being supplied by the nitromethane and the water being supplied by your hygroscopic methanol.

[Howard Rush]

How do you say "wanker" in Chinese or Pakistani?

This is the question of the hour, of course.  Google Translate does not offer Urdu or Chinese written translations, but does have a Chinese spoken translation.  Yahoo Babelfish doesn't know the Chinese for wanker, nor does it translate anything into Urdu. http://dictionary.englishtourdutranslation.com/?english=wanker&submit=Translate gives   احمق

Hope this helps.