Unsmoked sheet

TSR 5. Within the Malaysian scheme SMR 5 is restricted to mbber derived from sheet material prepared by conventional processes, ie, ribbed smoked sheet (RSS), air-dried sheet (ADS), and unsmoked sheet (USS) and presented in small bale form. Other countries may source different raw materials, eg, Indonesia produces SIR 5 from thin latex coagulum (14). SMR 5 prepared by pressing dry-sheet material into standard bales must be identified by the type of sheet material, eg, SMR 5RSS, on the test certificate as well as on the wrapping. 

A defect in raw rubber, generally the result of fungoid growth it was formerly common in unsmoked sheet rubber. 

Thin brown crepe Unsmoked sheets, wet slab, lump, and other scrap from estates and small holdings... 

Thick blanket crepe Wet slab, lump, and unsmoked sheets milled to give a crepe... 

Fresh lump and other high-quality scrap generated on the plantation Lump, tree scrapes, and smoked sheet cuttings are milled into a crepe Unsmoked sheets, wet slab, lump, and other scrap from estates and small holdings Wet slab, lump, and unsmoked sheets milled to give a crepe... 

Unsmoked sheet rubbers (USS) are produced with the simplest facilities available to smallholders and so it is difficult to achieve quality anywhere near RSS grade rubbers. Very often they are insufficiently dried and coloured by smoke. The quality of the rubbers could be improved to RSS grades by the intermediaries who further process them in small factories. The smallholders and... 

Tyre rubber is developed specifically for tyre manufacturing. It is prepared by coagulating NR latex containing oil with wet crumb rubber in the following proportion 30% latex rubber, 30% unsmoked sheet, 30% field coagulum and 10% plasticizer (oil). 

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