17 Semi-processed plastics; semi-processed plastic substances; plastic fibers, not for textile use; recycled plastic pellets for use in further manufacture; plastic film, not for wrapping, for agricultural purposes; flexible plastic films, other than for packaging, namely, for agricultural purposes; plastics in the form of sheets, films, foils, blocks, rods, slabs and tubes for use in manufacturing; semi-processed plastic films, including shrink films, film strips and tubular films; plastics materials in the form of mouldings and extrusions for use in further manufacture; foils, boards, poles and pipes made of plastic for use in manufacturing; tubes made of plastic for use in manufacturing; sealing materials, packaging materials in the nature of low-density polyurethane packaging foam, and insulating materials; packing, padding and stuffing materials of plastics or rubber; semi-processed synthetic resins; waterproofing plastic film, other than for wrapping, namely, for insulating; waterproofing plastic film, other than for packaging, namely, for insulating; semi-processed plastic sheet for agricultural purposes; plastic sheeting for agricultural purposes; plastic sheeting for use in horticulture; plastic sheeting for use in agriculture; plastic sheeting for preventing weed growth; plastics in extruded form for use in manufacture, and for use in agriculture and horticulture; plastics sheeting for industrial manufacture or agricultural use; interlocking knitted polyethylene sheets for use in agriculture; interlocking knitted polyethylene sheeting for protecting stored agricultural feeds, namely, silage sheets, silage pits, silage clamps, silage bales, straw bales and stacks; plastic mulches for use in agriculture and horticulture; non-woven protective plastic sheeting for agricultural purposes; plastic bunker covers in the nature of plastic sheeting for agricultural purposes; plastic film covers in the nature of plastic sheeting for agricultural purposes; plastic forage covers in the nature of plastic sheeting for agricultural purposes; plastic hay covers in the nature of plastic sheeting for agricultural purposes; plastic silage covers in the nature of plastic sheeting for agricultural purposes; silage sheets in the nature of plastic sheeting for agricultural purposes; oxygen barrier films for the protection of silage; oxygen barrier films for the protection of silage in bunkers, piles and bales; forage covers in the nature of plastic sheeting for agricultural purposes; bunker films in the nature of plastic sheeting for agricultural purposes; parts and fittings for the aforesaid goods