Ribbed smoked sheets are used in various industries due to their variety in the requirements on cleanliness and tear strength of the sheets. There are five major grades: RSS 1 to RSS 5. The difference in the grades is the result of the preparation of the coagulated field latex during the production of the Unsmoked Sheets. The sheets are selected and smoked at a controlled timing and temperature window to ensure that they are properly smoked without causing a negative impact on the rubber properties. RSS grades still depend heavily on visual inspection.
