Products » Natural Rubber  

  • Properties

    Natural Rubber is a mixture of organic polyisoprene derived from a milky colloid produced by Hevea trees. Thailand, Indonesia and Malaysia, representing about 70 percent of global NR supply are the largest producers of natural rubber. Other important producing nations include China and India. Unique physical and chemical properties of Natural rubber have made it a popular option for making elastomeric parts. The other advantages of Natural Rubber are tear resistant, abrasion resistant, waterproofing, and less heat generation.

    Different grades of Natural Rubbers: 

    Crepes

              Pale crepe rubber is among the highest quality crepes. Coagulation of this high-quality natural rubber is achieved with sodium hydrogen sulfite (NaHSO3). The sheets are packed as bales and marketed as "thin pale crepe".

    Sheets

    Two different types of sheets are distinguished:

    1. ADS (air dried sheets)

    Air dried sheets are less common. They have an appearance similar to RSS (ribbed smoked sheets), but are more transparent, as they are manufactured in smoke-free rooms.

    2. RSS (ribbed smoked sheets)

    Since these rubber sheets are not washed as intensively as crepes; they contain a higher proportion of serum constituents which encourage mold and rotting. For this reason, the sheets undergo an additional preservation process in which they are smoked in smokehouses. The sheets are hung in the smokehouses and dried for a week at temperatures up to 60°C. The specific smell of these sheets is caused by the materials used to produce the smoke. The sheets are pressed into bales and wrapped in protective sheets.

    Technically specified natural rubber (TSR) - Standard rubber

    TSRs are divided into a number of grades which are laid down in technical specifications drafted by ISO and are manufactured using new processing techniques.

    The advantages of Technically Specified Rubbers over the conventional sheet and crepe grades of rubbers are as follows:

    • Since it is available in a limited number of well-defined grades, correct choice of grades according to requirements by the consumers is rather easy.
    • Since it is possible to assess the actual content of foreign and volatile matter, mistakes can be avoided in deciding the actual worth of the material.
    • Since it is marketed as compact, polyethylene wrapped bales; degradation of the rubber on storage, handling and transportation can be reduced.
    • Since sizes have been standardized and the bales are compact, considerable savings can be made in transport through mechanized handling and containerization.

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