Natural rubber can be divided into solid natural rubber (film and particle rubber) and concentrated latex according to its morphology. In daily use, solid natural rubber accounts for the vast majority.

According to the different manufacturing processes and shapes, films can be divided into cigarette glue, air-dried film, white wrinkled film and brown wrinkled film.

Tobacco flake adhesive is the most representative variety of natural rubber, and it has always been a kind of adhesive with large dosage and wide application. Tobacco flake adhesive is generally classified according to appearance, which is divided into six grades: super grade, first grade, second grade, third grade, fourth grade and fifth grade. , can not reach the fifth grade is classified as equal external glue.

The delivery grades of natural rubber futures contracts in Shanghai Futures Exchange are domestic first-class standard rubber SCR5 and imported tobacco flake rubber RSS3, among which domestic first-class standard rubber SCR5 is also commonly called No.5 standard rubber, and all quality indexes of Natural Rubber GB/T808 1~ 1999 issued and implemented by the State Bureau of Technical Supervision are implemented.

Imported cigarette rubber RSS3 implements the International Standard for Grade Quality and Packaging of Natural Rubber (Green Paper) determined by the International Rubber Quality and Packaging Conference (version 1979).

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