This sub-class includes the manufacture of derivatives and/or intermediates produced from basic building blocks, for instance: •manufacture of synthetic resins, plastic materials and/or non-vulcanisable elastomers in the form of moulding and/or extrusion compound, solid and/or liquid resins, sheets, rods, tubes, granules and/or powders •manufacture of plastics in primary forms: polymers, including those of ethylene, propylene, styrene, vinyl chloride, vinyl acetate and/or acrylics, polyamides, phenolic and/or epoxide resins and/or polyurethanes, alkyd and/or polyester resins and/or polyethers, silicones, ion-exchangers based on polymers •acetyls, oxochemicals and/or its derivatives •cellulose and/or its chemical derivatives •manufacture of plastics powders, granules or flakes by compounding or reformulating plastics resins from recovered plastic waste •manufacture of recycled plastic by flaking and/or pelletising pre-treated plastic waste following material recovery operations •remelting of plastics to produce granulates or compounds