19 Polymeric compounds and composites used as a concrete substitute; non-metallic building materials made of polymeric compounds and composites, namely, structural building members, namely beams; posts; poles; slabs; building and construction panels, namely, roof panels, wall panels, floor panels, ceiling panels and fence panels and posts; trenches; pre-cast building foundations; erosion control and cavity lining shells; sewer lining shells; median crash barriers; curb facings; highway overlays; railroad crossing panels; drainage pipes; railroad ties; pre-cast bridges; utility poles and cross arms; planks; railings; industrial flooring; chimney stack linings; column linings; column covers; statues; markers; stepping stones; manhole covers; window sills; windows; doors; cellar transoms and roofing; and tiles