Two-component condensation type room temperature vulcanized silicone rubber is the most common type of room temperature vulcanized silicone rubber. The raw rubber is usually a hydroxyl-terminated polysiloxane, which is then combined with other additives and catalysts to form a rubber compound. The viscosity can range from 100 centistokes to one million centistokes. The vulcanization reaction of two-component room temperature vulcanized silicone rubber is not initiated by water in the air, but initiated by a catalyst. Generally, the silicone rubber, filler, and cross-linking agent are packaged as one component, and the catalyst is packaged as another component alone or in other combinations, but the catalyst and the cross-linking agent must be packaged separately. Regardless of the packaging method, curing only begins when the two components are completely mixed together. A common cross-linking agent is ethyl orthosilicate, and the catalyst is dibutyltin dilaurate. Add appropriate fillers and additives according to the properties of the desired final product. In recent years, because dibutyltin dilaurate is a substance of medium toxicity, the addition of dibutyltin to food bags and plasma bags has been banned, and has basically been replaced by octyltin with low toxicity.