Is it Cunifer or Kurnifer?
At 04:10 AM 9/13/2010, Oudesluys wrote:
> There seems to be some confusion about copper pipe used for brake lines.
>Copper (100%) tube is and has been used for brake lines. This can be
>a dangerous practice as copper hardens when deformed making it
>brittle and prone to cracking. This deforming takes place
>continuously when braking, as the pipe will expand and contract a
>bit every time you brake.
>If you use Cunifer, a copper alloy, there is no problem and this
>type of brake line has been around and used successfully for many
>years and several manufacturers use it as standard equipment.
>Copper can be recognized by its reddish color and its softness,
>cunifer is pale yellowish/white and much tougher.
>Copper coated steel brake lines (if they exist, I never came across
>them) are not a good idea because of electrolytic corrosion, the
>steel is sacrificed first and can fail after a fairly short time in
>wet and/or salty conditions. Zinc or cadmium plated lines are fine
>and used throughout the industry. The steel only corrodes if the
>zinc or cadmium has been sacrificed first and that only happens
>after many years.
>Stainless steel can be used as well but also has some issues. It is
>hard to get in the right (aircraft) quality, it is hard to bend and
>it is difficult to make the required double flanges. A lot of people
>make single flanges, and although this works OK generally, it is
>illegal in many countries. These single flanges can be prone to
>fatigue cracking if not executed properly.
>Kees Oudesluijs
>NL
>
>
Regards
Barrie
(705) 721-9060
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