High vacuum stations are designed with turbo molecular pump with a dry or oil-sealed backing pump. Low or medium vacuum stations are designed with roots pumping stations with different backing pumps, ratings and accessories. Desiccator: A desiccator is a sealed container typically made of glass or plastic that is used to store moisture-sensitive substances in a low-humidity environment. Nitrogen-Purged: Nitrogen-purging involves replacing the air inside the desiccator with high-purity nitrogen gas. This is done to displace the oxygen and moisture in the air, creating a dry environment within the desiccator.