It is a large volume grade of technically specified natural rubber. It is produced mostly from field coagulam, with lower grades of RSS and or unsmoked sheets.
General Characteristics:- TSR20 has excellent processing characteristics and good physical properties. Its low viscosity and easier mixing characteristic(compared with the RSS grades) will reduce the mastication and mixing period considerably.
Uses:- •Tyres •Cushion gum stock •Bicycle tyres •Raincoat proofing •Microcellular sheet for upholstery and packing •conveyor belts, foot wear and other general products.
TSR 10 is produced from clean and fresh field coagulam or from unsmoked sheets.
General characteristics:- TSR 10 has good technological properties similar to those of RSS2 and RSS3, but has the advantage over RSS from (1) lower viscosity and (2) easier mixing characteristic(slightly more rapid breakdown) as well as being technically specified and packed in modern packing.
Uses:- •Tyres, inner tubes •Cushion gum stocks •Joint rings by injection moulding •Raincoat proofing •Microcellular sheets, for packing, •Conveyor belts and foot wears.
Natural Rubber sheets are used mainly for automobile parts, conveyor belts, footwear, electrical insulators, mats etc.
TSR is graded net visually, but according to the source of the rubber (latex or field coagulum) and on its properties the bale size is reduced to a more convenient weight of 25 kg(55.1 lb). The bales are packed in polyethylene sheets to prevents contamination. Dry natural rubber graded or the basis of technical parameters are called Technically Specified Rubbers. TSR's are the major volume grades of dry rubber in production and exports in the major NR exporting countries of the world.
In India, the TSR's are designated as Indian Standard Natural Rubber(ISNR).
In Malaysia, the TSR is designated as Standard Malaysian Rubber(SMR).
In Indonesia, the designation given is Standard Indonesian Rubber(SIR).
In Thailand the TSR's are called Standard Thai Rubber (STR) .
The International Standards Organisations (ISO) have specified 6 different grades of Technically Specified Rubber.