โดย: เจ้าของร้าน เมื่อ:7 ปีที่ผ่านมา
Base Oils - Processing Overview Almost every lubricant used in plants today started off as just a base oil. The American Petroleum Institute (API) has categorized base oils into five categories (API 1509, Appendix E). The first three groups are refined from petroleum crude oil. Group IV base oils are full synthetic (polyalphaole…