Plastic sheet materials for use in manufacture; semi-processed plastic in sheet form; plastic sheet materials for use in the manufacture of countertops; plastic sheeting used in the construction industry as a vapor barrier; plastic sheeting for agricultural purposes; adhesive-coated plastic sheets for use in manufacture; plastic sheeting for use in the manufacture of laminated glass; acrylic sheets for use in manufacture; plastics in the form of sheets, films, blocks, rods and tubes; non-conducting materials for retaining heat.