[log in to unmask] wrote:
> 
> Gaby
> 
> First, comparative tracking index has nothing to do with X-ray but is related
> to the relative resistance of solid electical insulating materials to
> tracking under moist conditions at voltages up to 600 volts.  It is very
> seldome used in the US, but is a common for European requirement.  Refer to
> International Electrochemical Commission  (IEC Standard) Publication number
> 112.  Document may be procured through ANSI in the United States>  I do not
> have the numbers for many of the printed board materials, but the laminate
> suppliers, especially those who deal in Europe, can give you the tracking
> information on their materials.
> 
> Phil Hinton
> Hinton "PWB" Engineering
> 
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Thank you very much, Phil. I am sorry for my mistake concerning
the title of my request,I was sloppy while I wrote my correspondence
 and put the same title on two different letters. Of course XRay has
nothing to do wih CTI.
Gaby

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