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SAI International School
                                                     Class – VIII


                                               Subject – Chemistry
                               Topic – SYNTHETIC FIBRES AND PLASTICS


        Sub-Topic – Characteristics of Synthetic Fibres, Plastics and Types of Plastics



                                                  LESSON NOTES




        CHARACTERISTICS OF SYNTHETIC FIBRES:

              Synthetic fibres are very strong.


              Synthetic fibres are more durable.

              Synthetic fibres absorb very little, so dries up quickly.


              Synthetic fibres are wrinkle resistant.

              Synthetic fibres are light-weight and extremely fine.

              Synthetic fibres are not damaged by moths and other insects.

              Synthetic fibres do not get shrinked after washing and are easy to maintain.


              Synthetic fibres are less expensive and readily available as compared to those of natural
               fibres.




        DISADVANTAGES OF SYNTHETIC FIBRES:

              Synthetic fibres melt on heating and stick to the body of the person causing severe burns.


              Clothes made up of synthetic fibres make us feel hot and uncomfortable for wearing during
               hot summer weather.


            [NOTE:  The  manufacturing  of fully  synthetic  fibres is  helping in  the  conservation  of forests.
            This is because the fully synthetic fibres are manufactured from petrochemicals, so no trees

            have to be cut down for making them.]







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