Leveraging on over 15 years of expertise and experience in the industry
Though Synthetic Rubber (SR) varieties have become available, demand for Natural Rubber (NR) always remains high.
CoNTACT USGrades of rubber
Natural Rubber (NR) is produced from latex obtained from rubber trees in plantations. The most important forms in which NR is processed are the following: Sheets, Crepes, Block Rubber and Preserved Latex Concentrates.
Natural rubber (NR) processed into blocks adopting a new processing techniques is a notable improvement in the presentation of dry natural rubber. In India , block rubber is marketed with BIS specifications (IS4588 – 1986) and therefore, this rubber is termed as Indian Standard Natural Rubber (ISNR).
Two types of Sheet Rubber are produced and marketed in the international market, namely the Ribbed Smoked Sheets (RSS) and the Air Dried Sheets (ADS). Among these two types, Ribbed Smoked Sheet is the most popular and is available for consumption. There exist different grades of Ribbed Smoked Sheets rubber, namely RSS IX, RSS 1, RSS 2, RSS 3, RSS 4 and RSS 5.
GRADES WE HAVE
IRSS 1 refers to Ribbed Smoked Sheets, produced from natural rubber latex as ribbed sheets, by coagulation with acids and sheeting, properly air dried and smoked, and visually graded.
Ribbed smoked sheets (RSS) are graded based on visual assessment of quality. The International Rubber Quality and Packing Conference (IRQPC) have specified the grade descriptions, to establish acceptable grades for commercial usage.
Ribbed Smoked Sheets (RSS 3) is coagulated from high quality natural rubber latex produced by Thomson Rubbers. Rubber latex processed into ribbed rubber sheets and then sheeted, dried, smoked, and visually graded.
RSS3 rubber sheets are used in the production of Tyres (tires) & Tubes, Tread Carcass, Off road tyres & ADV tyres, Extruded hoses, Footwear etc. Tyre industry is the biggest consumer of RSS3 rubber sheets. The majority of rubber is exported as ribbed smoked sheets (RSS), (over 50%), of which ribbed smoked sheet no.3 ( RSS 3 ) constitutes the major part.
ISNR 20 (TSR 20) is general purpose Rubber graded by precise technical standards and not by visual characteristics. Some standards may vary marginally based on the origin. Technically Specified Rubber (TSR) is used for making tyres, tubes, rubber mats, cushion gum stock, raincoat proofings, micro-cellular sheet for upholstery and packing, conveyor belts, foot wear and various other rubber products.
TSR-20 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.
Skim Crepe (Skim Block) is a crinkly lace rubber, obtained when coagulated latex or any form of field coagulum (tree lace, shell scrap, earth scrap etc.) is passed several times through heavy rolls called crepers and then air dried at ambient temperatures. They are rapid-curing crepe or granulated (block) rubber containing a higher proportion of non-rubbers than ordinary sheet, crepe or block.
Estate Brown Crepe (EBC) is produced in Blanket Form from lump and other high grade natural rubber scrap (field coagulam) generated in rubber estates. Power wash mills are used in milling these grades into a form of thick and thin crepes.