plastic materials 96 synthetic polymers 15 plastic-making technology 14 polymers 13 plastic materials industry 7 material engineering 6 technology 6 more ... elastomers 5 composition materials 5 injection moulds 5 non-metal materials 4 plastic-making machines 4 recycling of wastes 4 construction materials 4 injection moulding 4 material testing 4 India-rubber 3 plastic materials construction 3 metal materials 3 macromolecular chemistry 3 materials 3 mechanical engineering materials 3 cars 2 safety of work 2 chemical industry 2 insulation materials 2 ceramics 2 models 2 occupational personal protective devices 2 wastes 2 less ...