Isopropyl alcohol, also known as isopropanol or rubbing alcohol, is a widely used disinfectant and cleaning agent. It is also a common laboratory reagent and solvent. In daily life, isopropyl alcohol is often used to clean and disinfect Bandaids, making the application of isopropyl alcohol even more common. However, like other chemical substances, isopropyl alcohol will also undergo changes in properties and performance after long-term storage, and may even be harmful to human health if used after expiration. Therefore, it is necessary to know whether isopropyl alcohol will expire.

To answer this question, we need to consider two aspects: the change of properties of isopropyl alcohol itself and the influence of external factors on its stability.

First of all, isopropyl alcohol itself has a certain instability under certain conditions, and it will undergo changes in properties and performance after long-term storage. For example, isopropyl alcohol will decompose and lose its original properties when exposed to light or heat under certain conditions. In addition, long-term storage may also lead to the generation of harmful substances in isopropyl alcohol, such as formaldehyde, methanol and other substances, which may have a negative impact on human health.

Secondly, external factors such as temperature, humidity and light will also affect the stability of isopropyl alcohol. For example, high temperature and humidity may promote the decomposition of isopropyl alcohol, while strong light may accelerate its oxidation reaction. These factors may also shorten the storage time of isopropyl alcohol and affect its performance.

According to relevant research, the shelf life of isopropyl alcohol depends on many factors such as concentration, storage conditions and whether it is sealed. Generally speaking, the shelf life of isopropyl alcohol in the bottle is about one year. However, if the concentration of isopropyl alcohol is high or the bottle is not sealed well, its shelf life may be shorter. In addition, if the bottle of isopropyl alcohol is opened for a long time or stored under adverse conditions such as high temperature and humidity, it may also shorten its shelf life.

In summary, isopropyl alcohol will expire after long-term storage or under adverse conditions. Therefore, it is recommended that you use it within one year after purchasing it and store it in a cool and dark place to ensure its stability and performance. In addition, if you find that the performance of isopropyl alcohol changes or its color changes after long-term storage, it is recommended that you do not use it to avoid harming your health.