>Is it the rubber from car tires that contain heavy metals?Are the tires
>manufactured with the metals in the rubber or do the tires pick it up from
>the road (a waste product of gasoline combustion)? OK rubber particles in
>soaker hoses are encapsulated by the polyethylene, but are particles of
>rubber in car tires coated. Is rubber coming off the roads and washing into
>fields and yards spreading heavy metals?
I meant copy your message to the fellow from Fiskars not to me, I am subscribed to Sanet, he is not.
The problem is that Cadmium is used to harden tires during manufacture, otherwise the rubber would not last long on the road. That is precisely the problem since they are using used auto tires for making the hoses.
I assume cadmium at some concentration is washing into roads' adjacent soils, I do not know if that is a serious hazard now, but in the long run it must be.
The reference to this problem emerged by the potential use (ie in permaculture) of old tires for making raised beds sides, earth and rock dams, planters, etc.
Since I use soaker hoses in elevated beds, I was concerned and asked the manufactures about this problem. The answer I got, is what I sent to SANET and other lists for further discussion and information.
Guillermo Romero Ibarrola
Comala, Colima, MEXICO
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