LG CS990DE Manual do Utilizador descarregar pdf (Página 5)

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Flame

retardants

Flame

retardants

are

present

in

printed

circuit

boards,

cables,

wires,

casings

and

housings.

Their

purpose

is

to

prevent,

or

at

least

to

delay

the

spread

of

fire.

Up

to

30%

of

the

plastic

in

a

computer

casing

can

consist

of

flame

retardant

substances.

Most

flame

retardants

contain

bromine

or

chloride,

and

those

flame

retardants

are

chemically

related

to

another

group

of

environmental

toxins,

PCBs.

Both

the

flame

retardants

containing

bromine

or

chloride

and

the

PCBs

are

suspected

of

giving

rise

to

severe

health

effects,

including

reproductive

damage

in

fish-eating

birds

and

mammals,

due

to

the

bio-accumulative*

processes.

Flame

retardants

have

been

found

in

human

blood

and

researchers

fear

that

disturbances

in

foetus

development

may

occur.

The

relevant

TCO'99

demand

requires

that

plastic

components

weighing

more

than

25

grams

must

not

contain

flame

retardants

with

organically

bound

bromine

or

chlorine.

Flame

retardants

are

allowed

in

the

printed

circuit

boards

since

no

substitutes

are

available.

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.

There

is

however

one

exception.

Mercury

is,

for

the

time

being,

permitted

in

the

back

light

system

of

flat

panel

monitors

as

there

today

is

no

commercially

available

alternative.

TCO

aims

on

removing

this

exception

when

a

mercury

free

alternative

is

available.

Environmental

requirements

1 2 3 4 5 6 7 8 9 10 ... 28 29

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