The new generation of PolyCable HFFR-compounds

HFFR cable compounds have found
there way into many areas of the cable
industry. They have the great benefit
that they do not produce any corrosive
or poisonous gases under flames. The
reason for this is the type of flame
retardation, which, contrary to PVC is
produced by a mineral flame retardant
as opposed to chlorine content. This
only splits off portions of water, which
prevents the flames from spreading
leading to the extinguishing of the
conduit.
However, in order to get good flame
protection a flame retardant content
of more than 60% will be necessary.
These high contents of flame retardant
make this types of compound very
viscous and the extrusions very difficult
in part.
The results are usually high melting
pressure, very high power consumption
of the extruder motor and rough
surfaces.
That’s why Polyplast Müller has developed
a new generation of HFFR
cable compounds that make extruding
much easier while at the same time
putting into practice a moderate price
level.
Both of the new HM4 compounds
PolyCable PPM 94001 HF and
94002 HF generate much less melting
pressure during extruding than conventional
HFFR compounds. Depending
on the extruder type and screw
being used, a pressure reduction of up
to 100 bar can be observed at the
head of the extruder. The power consumption
of the extruder also lowers
noticeably. The motor and transmission
of the extruder are therefore less
stressed and the speed can be increased.
Both of the new HFFR compounds,
PolyCable PPM 94001 HF and PPM
94002 HF meet the requirements of
VDE 0207 Part 24 Type HM4 with very
good reserve capacity.