25 pounds. Please
us for details.
used for making rubber bands is made from latex emulsion collected from
the rubber tree, called Hevea Brasiliensis. It planted in
very large plantations in tropical countries such as Thailand, Indonesia
Below is a brief timeline of landmarks in the advancement of rubber:
- 1496 :
Columbus discovered natural rubber in Haiti where he saw the natives there
playing with ball made from the "sap" of a tree called "cau-uchu."
rubber was introduced to the western world by Charles de la Condamine.
Priestly found that natural rubber could erase or rub away pencil mark,
hence he called the material "rubber."
Hancock invented a machine called "masticater" that allowed the rubber
to be softened, mixed and shaped.
Goodyear discovered the process of vulcanization. Vulcanization involves
heating the natural rubber which causes a complex chemical change to occur.
But in layman's terms, vulcanizing gives rubber its elasticity and other
desirable properties so that it's useful.
Henry Wickham collected some 70,000 seeds and secretly carried them to
London from Brazil. Later years, these rubber trees were planted in large
scale in Asia (in places such as Ceylon and Singapore) as well as Africa.
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