Ribbed Smoked Sheet has advantages of cleanness, color and doesnt contain defects such as air bubble that can be seen with naked eyes. Its important to guarantee purity to produce RSS rubber. Its necessary to supply clean water to dilute latex and to clean during the time of forming rubber sheets. Its necessary to collect latex early to avoid quick formation of coagulum and its possible to use popular anti-freeze agents such as Na2SO3. Intake of using anti-freeze agent may be various depending on condition but not more than 0.*5% in case of dry rubber. There are some freezing methods, its possible to freeze into separate blocks by using a freezing kettle or its possible to freeze into continuous sheets.