The survey of Casumina (Casumina) shows that a lot of Malaysian rubber such as SMR 10/20 has a very small variation of the technical indicators (Po - RRI) and Mooney viscosity (3-5%) [1], it is useful for synthetic rubber - press products - shaping, even higher product and reducing the incidence of disability. So why in the Vietnam one of the nation's largest exporters of natural rubber in the world, the tire manufacturer of Vietnam has to import rubber from neighboring countries? That is because the quality of natural rubber in our country still have some issues that make corporations have difficulty in producing, mixing impurities in the latex phenomenon before selling to factories still happen in many places.
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