plastics and synthetic resins as raw materials for use in further manufacturer, namely, esters of acrylic and/or methacrylic acid in the form of liquids, syrups, pastes, beads or granules; unprocessed plastic materials in liquid form, namely, esters of acrylic- and/or methacrylic acid as impregnation fluids for the impregnation of porous substrates, in particular for natural stones, concrete, asbestos, wood, metal; unprocessed plastic materials in liquid, powder and paste form, namely, esters...