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LOW SMOKE ZERO
HALOGEN (LSZH)
What does it mean? |
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LSZH
LSZH simply translates to
Low Smoke Zero Halogen and
refers to the behaviour of
chemical compounds when
combusted-specifically the
quantity of smoke generated
and the toxicity of the
emissions.
Halogens- What are they??
Halogens are a guoup of five
elements comprising;
Fluorine, Chlorine, Bromine.
Iodine and Astatine. |
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Halogens- and the effect of
combustion
In their BAsic form, Halogens are
very toxic, strong oxidizers and
very chemically reactive. In the
ever of combustion, LSZH and non
LSZH cables behave in very different
ways, as indicated below. |
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What is the difference
between LSZH and non LSZH
cables?
LSZH cables have a zero
halogen content, emit no
toxic fumes, generate very
little smoke and produce no
corrosive or caustic acids.
LSZH cable are therefore
ideally suited for all
marine applicetions where
personnel safety and
protection of valuable
equipment are of paramount
importance.
They also generate large
volumes of dense black smoke
that blocks visibility and
severely disrupts evacuation
procedures. The smoke and
fumes can also lead to
suffocation from smoke
inhalation. A one metre
length of burning cable that
contains 0.85Kg of PVC will
completely obscure a room of
100m3 with black toxic smoke
in less than five minutes. |
When Combusted. Halogens
combine with moisture to
form Hydrochloric Acid. This
extremely corrosive acid is
potentially deadly to humans
and always causes extensive
property damage. Acid of
this nature aggressively
attack electrical
switchboards, motors,
fixtures, furnishings, floor
coverings, paint surfaces
etc. In many cases the
effects of acid corrosion
after a fire are much more
severe than the actual fire
damage itself. |
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