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.