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Cadmium**
Cadmium is present in rechargeable batteries and in the colour-generating layers of
certain computer displays. Cadmium damages the nervous system and is toxic in high
doses.
The relevant TCO'99 requirement states that batteries, the colour-generating layers of
display screens and the electrical or electronics components must not contain any
cadmium.
Mercury**
Mercury is sometimes found in batteries, relays and switches. It damages the nervous
system and is toxic in high doses.
The relevant TCO'99 requirement states that batteries may not contain any mercury. It
also demands that mercury is not present in any of the electrical or electronics
components associated with the labelled unit.
CFCs (freons)
The relevant TCO'99 requirement states that neither CFCs nor HCFCs may be used
during the manufacture and assembly of the product. CFCs (freons) are sometimes
used for washing printed circuit boards. CFCs break down ozone and thereby damage
the ozone layer in the stratosphere, causing increased reception on earth of ultraviolet
light with e.g. increased risks of skin cancer (malignant melanoma) as a consequence.
Lead**
Lead can be found in picture tubes, display screens, solders and capacitors. Lead
damages the nervous system and in higher doses, causes lead poisoning.
The relevant TCO'99 requirement permits the inclusion of lead since no replacement
has yet been developed.