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The ability of lubricating oil to resist oxidation during storage and use is known as oxidative stability (antioxidant property), and it mainly depends on the properties of its components, being related to thickeners, base oils, and additives. Non-soap thickeners are mostly organic or inorganic thickeners with good thermal and oxidative stability; they do not oxidize easily themselves, nor do they act as catalysts for the oxidation of the base oil ； Greases prepared with soap-based thickeners have poor oxidation stability. In terms of different soap bases, the order of their catalytic effect on the oxidation of the base oil is: lithium soap > sodium soap > calcium soap > barium soap > lead soap. Within the same series of products, the higher the content of thickeners, the more pronounced the catalytic effect. The A1250 Insulating Oil Oxidation Stability Tester developed by Delit Beijing Technology Co., Ltd. complies with the standards SH/T0811-2010 and SH/T0206-1992. It uses metal bath heating, eliminating the need for additional fuel; it is energy-efficient and environmentally friendly, as well as easy to use. ID control enables rapid stabilization once the target temperature is reached, reducing waiting time. It features a built-in over-temperature protection device, ensuring greater reliability and safety. It is suitable for testing the oxidative stability of insulating oils. A1250 is an automated instrument preferred by manufacturers and users of transformer oil, as well as various relevant universities and research institutions, for testing the oxidation stability of transformer oil. Technical parameters of the oxidation stability tester: Power supply: AC220V±10%, 50Hz; Power consumption: ≤1100W; Temperature control range: Room temperature to 160°C; Temperature control accuracy: ±0.5°C; Number of test samples: 6 channels