The wear-resistant, reactionless HT metering system with tandem plunger pumps is suitable for extreme demands in various output ranges. HT piston metering machines are capable of processing filled and unfilled components in absolute conformity with the formulation both in a discontinuous and continuous operation. This means that the robust metering machines are for example qualified for processing polyols with different fillers, abrasive colour pigments or high-viscosity raw material systems. TOPLINE HT machines also offer major advantages in the processing of synthetic resin using the RTM method (Resin Transfer Moulding). Two machine types (HT80 and HT180) are available, covering an output range of 8 - 360 cm³/s. In addition to processing polyols with solid flame retardants – for example, ammonium polyphosphate, melamine resin and expanded graphite – the systems are also particularly suitable for processing polyols made of renewable raw materials, recycled polyols, polyols with fillers such as PUR regrind or abrasive fillers such as glass fibers, calcium carbonate, barite, abrasive colour pigments and highly viscous raw material systems.