17 Semi-processed plastic materials, namely, semi-processed plastic substance; plastic in the form of rods and profiles for use in manufacturing; plastic in the form of tubes and flexible sheaths for use in manufacturing; semi-processed foams of plastic and semi-processed plastics in the nature of filtering materials in the gardening, agriculture, horticulture and forestry industry ; insulating materials; films, sheets, plates and sheaths of plastic, perforated or not, and with mesh structure for gardening, agriculture, horticulture, forestry; semi-finished biodegradable plastic sheets, films, plates and sheaths for use in manufacturing; non-metallic reinforcements for ducting, namely fabric expansion joints for piping and rigid ducting; insulating tapes; pipe seals, namely, rings of rubber for use as pipe connection seals; waterproof packings for packaging and sealing purposes; watering hoses; non-metallic flexible pipes, of textile material; flexible pipes not of metal; pipe jackets, not of metal; junctions, not of metal, for pipes; rigid plastic materials, namely semi-finished injection molded products of plastic for use in the gardening, agriculture, horticulture and forestry industry; sound insulating structures, not of metal, namely acoustical insulation barrier panels; non-metallic heatproof membranes, namely, multi-purpose thermoplastic heat shrinkable tubing; non-metallic insulating membranes, namely, insulating coatings; non-metallic water-repellent membranes, namely, waterproofing membranes for building foundations; acoustic screens for building