Transparent cones are used in paper mills that recycle used cardboard. The cardboard to be recycled is dissolved in water and cleaned through a chemical-physical process.
The water-carton mixture (mist) circulates inside a circuit where inspection cyclones are inserted, which must necessarily be transparent to allow a visual inspection of the mist.
The inspection cyclones used in this type of plant are usually made of Plexiglas; this material has excellent transparency but is fragile and not very resistant to abrasion.
At the request of some paper mills, Politec used polyurethanes appropriately formulated for transparency, abrasion resistance and hydrolysis resistance, ensuring a much longer life than cones constructed with Plexiglas.