A parachute is a device used to slow down the movement of a person or an object when such person/object falls or moves through the air. Parachute is made of nylon because it is more elastic, more resistant to mildew and less expensive.

Acrylic is a popular synthetic fibre that is used as a cheaper substitute of wool. It can be dyed and is available in vibrant colours.

Polymers that occur naturally is cellulose. Cellulose is made up of a large number of glucose units.

 Wood, coal and petroleum are used as raw materials for manufacturing synthetic fibres.

  Synthetic fibres are made from cellulose, which comes from th plants.

 Melamine is a special type of synthetic plastic which is fire resistant and is used in the making of uniforms of firemen. Teflon is also a synthetic fibre but it is not fire resistant.

 PVC is a thermoplastic. Also, polyethylene is a type of polymer that is a thermoplastic and PET is a thermosetting plastic.

 Electric plugs and switches are made of thermosetting plastics because they are bad conductors of heat and electricity. So, bakelite and melamine both are used to manufacture plugs and switches.

 Recycling is the process of recovering and reprocessing the material into useful products, sometimes completely different in form from their original state. Both plastic carry bags and toys can be recycled.

Fibres which are obtained from natural sources are called natural fibres. For example – cotton, silk, wool, etc. Synthetic fibres are small units of chemicals joined together in the form of chain and these are more durable and stronger than natural fibres.

Artificial silk or (as the term is used in the textile industry) Art silk is a synthetically manufactured fibre which resembles silk but is cheaper to produce. Art silk is just a synonym for rayon and it is also sometimes called bamboo silk. In the present day, imitation silk may be made with rayon, mercerised cotton, polyester, a blend of these materials, or a blend of rayon and silk.

Both silk and rayon are highly durable and versatile and have the same comfort properties. 

 Wood is a biodegreable substance because it is decomposed by the action of microorganisms.

 When rubber is vulcanised, it becomes cross-linked. This linking of stronger bonds makes vulcanised rubber over 10 times stronger than natural rubber. 

Terylene is a popular polyester. It can be drawn into very fine fibres that can be woven like any other yarn.