Types of plastics
Plastics . types of plastics . differentiate between thermoplastics and thermosetting plastics The dictionary meaning of plastic is 'capable of being easily formed or moulded'. There are a number of synthetic materials available under the name of plastics. Plastics have their origin in the chemical synthesis of materials from different sources like -agriculture -agriculture and petroleum -petroleum and coal -petroleum and mineral -minerals Of these, coal and petroleum are mostly used in making plastics Plastics are divided into three major categories -thermoplastic -thermo-setting plastics -elastomers Thermoplastics These are formed into shape by the application of heat and pressure. They soften when heated, and become solid agian when cooled. There is no chemical change in the moulding operation. Thermoplastics are -nylon -polythene -polypropylene -polystyrene -poly vinyl chloride -acrylic resin -cellulose Nylon(polymide) It is strong, tough and of light weight. It has a good ...