A thermoplastic is a type of plastic made from polymer resins that becomes a homogenized liquid when heated and hard when cooled.
As similar as colonial iron manufacture was to that of medieval Europe, yet it differed greatly from the type of iron manufacture in eighteenth century early modern Europe. Existing conditions of natural resources greatly affected the development of technical innovation in the field of iron manufacture.
Cast Iron: An Invention of Ancient China. By Karin Alsop, Claire Deng, & Karen Kwan. A drawing of an early blast furnace. inventor unknown. earliest cast iron artifact found in Jiangsu. Mass-production began in the Han dynasty. At the time of its invention, cast iron had many uses. Since the discovery of steel, iron (both cast and wrought) has become less common, as steel is generally stronger. Cast iron is still used in buildings, although they are usually older or decorative ones.