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Rubber exists in two forms namely synthetic rubber and natural rubber. Natural rubber is made from latex obtained from rubber trees, rubber grass and other plants going through dispensation of gelatine. Synthetic rubber is a result of polymerization and consists of various monomers. The combined properties of natural rubber overshadow synthetic rubbers or combinations of synthetic rubbers available. However, synthetic rubber is beneficial because it is easier to produce. Natural rubber is a crop that is grows only in tropical climates and the trees do not age well. Therefore, a number of countries use the easier choice, synthetic rubber. Synthetics may also be more useful in certain applications because of their resistance to extreme temperatures and harsh environments. Physical properties of natural rubber at room temperature include low heat production at many deformations, very good mechanical strength, high elasticity, plasticity, and lesser hysteresis. Hence the flexing resistance of natural rubber is quite efficient, and because it is not polarity rubber, its electric insulation performance is also very good. Chemical properties of natural rubber are quite good because of the presence of unsaturated double bond; it has strong ability for chemical reaction. Radiation, ozone, light, heat, stretchy distortion, manganese, copper and other metal can stimulate the aging of rubber, not tough to aging is one of the flaws of natural rubber. However, by addition of the stabilizer to natural rubber, the natural rubber sheeting can be kept for a longer duration. Medium resistance properties of natural rubber comprise of good alkali resistance property, but it is not impervious to strong acid. Natural rubber sheets can only dissolve a few polarity solvents, while carbon disulphide, ether, hydrocarbon, senior fatty acid, senior ketone and halogenated hydrocarbon, are dissolved in natural rubbers. Synthetic rubber sheets have a few variations which behave same as the behaviour of natural rubber, but mostly they are different from natural rubbers. For example, both of them are highly elastic polymer material, mostly require curing and processing, then to be practical and get using value. Synthetic rubber in general is not that complicated than natural rubber on the uses, but it has high elastic, insulation, air tightness, oil impervious, resistant to high or low temperature, thus it is extensively used in transportation industry, national defence, agriculture and routine life. Natural rubber comes from latex and is mostly polymerized isoprene with a little amount of impurities present in it. This limits the range of assets available to natural rubber. Addition of sulphur and vulcanization are used to enhance the properties of natural rubber. Synthetic rubber can be obtained from the polymerization of various monomers including isobutylene (methyl propene), chloroprene (2-chloro-1, 3-butadiene), 1,3- butadiene, and isoprene (2-methyl-1, 3-butadiene) with a little amount of isoprene for cross-linking. These and other monomers can be mixed in various required proportions to be copolymerized to obtain an extensive range of physical, mechanical, and chemical properties. The monomers can be generated unadulterated and the addition of impurities can be taken care by design to give ideal properties. Find high quality rubber products at KV Enterprises, the distributor of natural rubber beadings, adhesive& sealant for automotive industry at Coimbatore, India.
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