Although shelf life is generally a term for storage rather than service life, it is important to note that storage conditions affect the useful life. Shelf life varies according to product specifications and compound design. The gasket material is usually kept for several months before use. Therefore, the shelf life is an important consideration for the end user. The failure of the gasket may be the result of a combination of oxygen, ozone, light, heat, humidity, oil, water, solvents, acids, and vapors. For binder-free graphite and PTFE gaskets, the sheets and gaskets of these materials actually have an almost indefinite shelf life. For metal and semi-metal gaskets of graphite or PTFE soft materials, the ideal shelf life is infinite under ideal conditions. However, in practice, excessive dust may cause compatibility problems with the process, and exposure to moisture and moisture may cause oxidation of metal components. Poor storage conditions can lead to premature quality degradation, especially if the temperature is high, humidity is not appropriate, and strong light is present.