Classification of ribbed smoked sheet is done by observation: + RSS 1: bubble, no dust, no stain. + RSS 2: mini bubble, no dust, no stain. + RSS 3,4,5: foamy, no dust, no stain. * Application Due to characteristic conditions and manufacturing method, RSS rubber is widely used in engineerings such as manufacturing tire surface; RSS rubber is formed into sheets so the rubber is of high tensile force and less aging than granulated rubber. Therefore, this rubber is suitable for producing products which require high tear resistance, wear resistance and hardness.