YT-183 is an efficient methyltin based heat stabilizer which is suitable to be used in calendaring and blow molding process to produce food-contact PVC and its polymers such as rigid clear PVC sheet and film. YT-183, which is formulated to have a lubricant same as the one used in octyltin based stabilizers, offers similar lubricating capacity as octyltins do and could be a substitute for octyltin based stabilizers. It has good initial pigmenting property and excellent processing stability, and will efficiently maintain good stability of recycled materials. By introducing high efficiency deodorization technology, YT-183 has very weak odor.