Para-rubber is the compound containing the large
molecules. Chemically, it is categorized into the polymer
compound. Its special characteristic is highly flexible
which can be called elastomer [1]; the name of elastomer
is often used interchangeably with the term rubber, and is
preferred when referring to vulcanisates. Thus some text
books give the meaning of elastomer to vulcanized
product [2]. Normally, the flesh latex from para-rubber
trees composes of rubber content from 20% up to 45%
(depends on many factors), non-rubber components
around 5% and the rest is water. In order to transport the
latex to the factories, the latex is concentrated for saving
the transportation cost. The preferred level of
concentration is 60% and it is so-called concentrated
latex. Using of concentrated latex makes the products to
have the regular quality when compared to that with flesh
latex. This is because the non-rubber components are
separated during concentration process. There are four
processes for producing the concentrated latex;
evaporation, creaming, electro decantation and
centrifuging. The method of centrifuging is used widely in
economic scale (around 90% of total production of
concentrated latex) [3]. The quality of concentrated latex
is depended on the quality of flesh latex, thus some
properties of flesh latex must be examined and controlled