Natural rubber has excellent physical and chemical properties, after appropriate treatment also has oil resistance, acid resistance, alkali resistance, heat resistance, cold resistance, abrasion resistance and other characteristics, thus a wide range of uses. Since the establishment of China's first rubber factory in 1915, China's rubber industry has a hundred years of history. With the growing demand for natural rubber consumption in China, natural rubber has been positioned as an "important strategic material and industrial raw material".
Basic Overview of Natural Rubber
Natural rubber is a rubber hydrocarbon (cis-1,4-polyisoprene) as the main component of natural polymer compounds, 91% to 94% of its composition is rubber hydrocarbon, the rest is protein, fatty acids, ash, sugar and other non-rubber substances.
From the point of view of tariff, natural rubber under tariff item 40.01 mainly includes natural latex, smoke rubber sheet, technical classification of natural rubber (TSNR), balata gum, gutta-percha, silver gum chrysanthemum gum, sugar gum gum gum and similar natural gum, etc.. China's current imports of natural rubber mainly includes natural latex, smoke rubber sheet and technical classification of natural rubber.
1, natural latex
Natural latex is mainly from the rubber tree, especially the Brazilian rubber tree secretes out of the liquid. This liquid from the rubber (i.e., high molecular weight polyisoprene) solid content of 30% to 40% of organic matter and minerals (proteins, fatty acids and their derivatives, salts, sugars and glucosides) dispersed in water, the formation of an aqueous solution composition.
The process includes: gum cutting, gum collection, purification, solidification, creping, granulation, drying and packaging.
Gum cutting - Gum harvesting - Purification - Coagulation
Creping - Granulation - Drying - Packaging
2、Tobacco Sheet
Smoke film, also known as smoke sheet rubber, RSS, that is, the smoke and heat generated by burning coconut shells on the natural film pressed to remove the moisture of the film obtained after smoking, amber-colored, slightly transparent, slightly smoky odor. The purpose of smoking is to dry the film and to inject the cresol substance to prevent oxidation and corrosion.
3、Technical classification of natural rubber
Technical classification of natural rubber, that is, countries in accordance with the specific composition of natural rubber, impurities, standardized development of standard grades, after the product grade classification of rubber. According to the tax code notes, this dry natural rubber after processing, testing and in accordance with the following table specifications are divided into five levels.
Applicable tariff rates
The distribution of the main import commodity categories and tariff lines of natural rubber is shown in the table below. Among them, natural rubber latex, smoke film, technical classification of natural rubber within the year the provisional tariff rates for the ad valorem and ad valorem both from the lower.