Dimethylsilicone oil is a commonly used organosilicon compound, widely used in cosmetics, skincare products, lubricants and other fields. However, long-term use or improper storage may lead to the deterioration of dimethyl silicone oil, thereby reducing its effectiveness and even producing adverse reactions. Therefore, it is of great significance to conduct deterioration detection on dimethyl silicone oil. Firstly, the appearance of dimethyl silicone oil can be observed to preliminarily determine whether it has deteriorated. Under normal conditions, dimethyl silicone oil should appear as a colorless and transparent liquid, while deteriorated dimethyl silicone oil may appear cloudy, cloudy, or show color changes. This is because during the metamorphism process, the molecular structure inside the dimethyl silicone oil changes, leading to changes in its physical properties. Secondly, the odor of dimethyl silicone oil can be detected to determine its deterioration. Normal dimethyl silicone oil has a slight special odor, while spoiled dimethyl silicone oil may emit a pungent, sour, or putrid odor. This is because during the metamorphism process, harmful substances or oxidation products may be produced inside the dimethyl silicone oil. In addition, the deterioration of dimethyl silicone oil can be detected by measuring its density. The normal density of dimethyl silicone oil is relatively stable, while the density of deteriorated dimethyl silicone oil may change. By using density meters and other equipment, the density of dimethyl silicone oil can be measured and compared with the normal density to determine whether it has undergone metamorphism. Finally, performance testing can be used to detect whether dimethyl silicone oil has deteriorated. Normal dimethyl silicone oil has good lubricity, transparency, and stability, while deteriorated dimethyl silicone oil may experience a decrease in lubricity, transparency, or stability. By using corresponding performance testing methods such as friction coefficient testing, transparency testing, and stability testing, a comprehensive performance evaluation of dimethyl silicone oil can be conducted to determine its deterioration. In summary, by observing the appearance, odor detection, density measurement, and performance testing, the deterioration of dimethyl silicone oil can be accurately judged. Timely detection and replacement of deteriorated dimethyl silicone oil can help ensure product quality and effectiveness, while protecting the health and safety of users. Therefore, for manufacturers and users of dimethyl silicone oil, it is crucial to master the correct method of deterioration detection.