This is obtained from the milk of some special types of the trees found in the equatorial evergreen forest and this milk is called Latex. Early time this was frequently used to erage the mark made by the graphite pencil on the plane white papers and it is called rubber. Later due to some unique characteristics like elasticity, water resistance, bad conductivity of heat and electricity etc these rubbers are started to be use in various industries for various purposes. In the primitive days rubbers were obtained in the product forms of forests of Amezan and Zarie. In Amezan river basin Dhroni place was the main region of the rubber production and so it was also called wild rubber. Later in 20th century the plantation of rubber was started in Malaya and in south-East Asia.
There are two types of Rubber
1. Natural Rubber:- Natural rubberis obtained from some special types of milk of trees called latex. Thus it is the rubber which is obtained naturally and almost all rubber is the polymer of Isoprene (C5H8).
2. Synthetic rubber:- The rubber which is produced chemically and artificially is called synthetic rubber and outstanding contribution with regard to its discovery goes to Mathews and Haress. Mathews and Hariss extracted a polymer like natural rubber on heating isoprene with sodium at 60 degree celsius, and called it synthetic rubber. Ther are so many synthetic rubbers like polystyrene, Dupren rubber, Neoprene rubber, thiokol rubber, polyvinyl chloride etc.
