> -----Original Message-----
> From: Peter L. Peres [mailto:plp@ACTCOM.CO.IL]
>
> Tyre rubber has some additives that make
> it slightly conductive afaik.


It's carbon, and that's why they are black. It is added to the rubber in
order to help protect against UV (which is why rubber bands deteriorate),
and also to (slightly) improve wear characteristics. I don't believe the
intention is to make the tyre conductive, but it must therefore be a side
effect, that is quite useful. I've no idea just how conductive tyres are.

Interestingly, wax is also added to the rubber. This leeches out as the tyre
is used, and provides a very thin coating around the tyre, which helps
protect against ozone (which oxidises rubber). Old / high milage tires start
to go hard and grey due, in effect, to this wax "running out".

Jon

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