Films made of HDPE are noted for their characteristic rustle and
milky colouring
and they are odourless.
By adding colour concentrates a lot of colour variants can be
achieved and by means
of additives films with the desired properties can be produced.
Unlike LDPE films,
their structure is duller, their strength is higher, they are
hazier, and they are not shrinkable.
The thermal endurance of HDPE films is from −50 °C up to +110 °C.
Under everyday conditions of use HDPE films are resistant to most
chemical substances,
they do not cause corrosion of the products packed in them, and
they can be welded.
They have minimum permeability of water vapours and smells, and
they transmit oxygen,
fats, and aromatic substances in a very limited amount. Generally,
HDPE films are more
chemically resistant, which is given by their structure.
In the natural variant, HDPE films are suitable for direct contact
with foodstuffs,
the colour variants only if the pigment content is within the
concentration defined by the
producer. HDPE films are environmentally unobjectionable and
recyclable, and they
can be disposed of in landfill or by combustion in which no
substances harmful to the
environment are released.
