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.
Iron and steel smelting. Iron and steel smelting skills are invented in antient China. [nipic.com] It has been confirmed by archaeological evidence that iron, made from melting pig-iron, was developed in ancient China in the early 5th century BC during the Zhou Dynasty (1050 BCï¼256 BC). During the Shang Dynasty (1600 BCï¼1046 BC) to the Eastern Zhou Dynasty (1050 BCï¼256 BC), China went into a flourishing period for steel smelting.