Ribbed Smoked Sheets (RSS) are coagulated rubber sheets processed from fresh field latex sourced from well managed rubber plantations adopting modern processing methods. The grades available are shown in the table. The higher grades RSS 1x to RSS 3 are mainly used for manufacture of products for medical, pharmaceutical and engineering. The lower grades of RSS 4 and 5 are generally used for the manufacture of automobile tyres, re-treading materials and all other general products. RSS 3 and RSS 4 are the preferred raw material for radial tyres. Quality of Ribbed Smoked Sheets is ascertained as laid down in Green Book Standards.
In India, RSS grades are packed as 50kg bales in polythene cover and as 110kg crates as per the requirements of the buyer. Ribbed Smoked Sheets are graded according to the standards as per IS – 15361-2003 by visual comparison method. Normally this is done by observation of sheets held against light, when the obvious defects become apparent.
Cluster groups formed among rubber farmers in India, popularly known as “Rubber Producers Societies (RPS) are involved in the production of high quality grades in their group processing centres for domestic and world markets. High grade sheets are produced in individual farms as well. Domestically produced RSS rubber grades are in good demand for tyres and other product manufacture indicating their quality and market acceptability.
Oxidized spots or streaks, weak, heated, under cured, over-smoked, opaque and burnt sheets are not permissible in this grade. The rubber must be dry, clean, strong, sound and evenly smoked, and free from blemishes, specks, resinous matter (rust), blisters, sand, dirty packing and any other foreign matter, except slight specks. Small pinhead bubbles, if scattered, will not be objected to.
Slight blemishes in color, small bubbles and small specks of bark permissible in this grade. Oxidized spots or streaks, weak, heated, under-cured, over-smoked, opaque and burnt sheets are not permissible in this grade. The rubber must be dry, clean, strong, sound and free from blemishes, blisters, sand, dirty packing and all other foreign matte r other than specified above as permissible.
Medium size bark particles, bubbles, translucent stains, slightly sticky and slightly over smoked rubber are permissible. Oxidized spots or streaks, weak, heated, under-cured, over-smoked, and burnt sheets are not permissible. The rubber must be dry, clean, strong, sound and free from blemishes, blisters, sand, dirty packing and all other foreign matter other than specified above as permissible
Large bark particles, bubbles and small blisters, stains, over-smoked, slightly sticky rubber and blemishes are permissible. Slightly under-cured rubber is permissible. Weak, heated, burnt, oxidized spots or streaks are not permissible. The rubber must be dry, firm and free of blisters. Dirty packing, sand and all other foreign matter other than specified above is not permissible.
Oxidized spots or streaks, weak, heated, undercured, over-smoked, opaque and burnt sheets are not permissible in this grade. The rubber must be dry, clean, strong, sound and evenly smoked, and free from blemishes, specks, resinous matter (rust), blisters, sand, dirty packing and any other foreign matter. Small pinhead bubbles, if scattered, will not be objected to.
Processing of natural rubber into blocks similar to synthetic rubbers adopting cost effective and modern processing methods is a notable improvement in the presentation of dry natural rubber from India. This is in line with the consumer preference in the world rubber market for Technically Specified Rubber, which has the following advantages:
ISNR 3 CV : High quality products with superior dynamic properties.
ISNR 3 L : Colored products like injection bottle caps, syringe heads, transparent items.
ISNR 5 : Moulded and extruded items like auto components, bridge bearings,rubber linings etc.
ISNR 10 : Inner tubes, conveyor belts, footwear, water proofing materials, hoses and tubes.
ISNR 20 : All types of automobile tyres, re-trading materials, mats and other generalrubber products.
Produced from field latex, it is used in performance tyres, industrial rollers and other applications requiring high quality, light coloured rubber. SVR 3L is sometimes used as an alternative to TSR 5 grade rubbers because its lower viscosity enables quicker mixing time.
Natural Rubber (NR) is produced from the crop harvested from rubber plantations both in the latex form as well as in the field coagulam form. Latex is a milky white dispersion of rubber in water and field coagulam is the auto coagulated latex on the tapping panel (tree lace) and the collection cups (shell scrap and cuplumps).
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