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广播Event announcements :
Classification and Quality Standards of Natural Rubber Categories
Time: 17 January 2017 Source: Far East Material Trading Center Co., Ltd

Natural rubber can be divided into two categories according to the form, namely solid natural rubber (rubber sheet and pimpled rubber) and latex concentrate.

Solid natural rubber accounts for an overwhelming part of rubber in daily use.    
Rubber sheet can be divided into smoked sheet rubber, air-dried rubber sheet, rubber crepe sheet and brown crepe sheet based on different manufacturing processes and appearances.

Smoked sheet rubber, the most representative category of natural rubber, is the rubber category with largest consumption and most extensive application. According to appearance, smoked sheet rubber is generally divided into six grades including RSSX, RSS1, RSS2, RSS3, RSS4 and RSS5. For those fails to meet the requirements of RSS5, they are classified as off-grade rubber.

Pimpled rubber (i.e. standard rubber) is graded as per the unified international physical and chemical performance and indexes. The physical and chemical performance is composed of seven items which are impurity content, initial plasticity, plasticity retention rate, nitrogen content, volatile content, ash content and color index. Among them, impurity content is the dominant index. Five grades, 5L, 5, 10, 20 and 50, are divided according to the content of impurities.

In Shanghai Futures Exchange, one of the futures trading markets in China, the contracted deliverable grade of natural rubber is the first grade Standard Chinese Rubber SCR5 and imported smoked sheet rubber RSS3. The first grade Standard Chinese Rubber SCR5 is also known as No. 5 standard rubber, subjecting to various quality indexes of GB/T8081 ~ 1999 versions on natural rubber issued by the State Bureau of Technical Supervision for implementation. The imported smoked sheet rubber RSS3 is subjected to the International Standards of Quality and Packing for Natural Rubber Grades (the Green Book) (1979 Version) determined by the IRQPC.

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