These are steel containers that are plated with a sheet of tin on both sides. Numbers like #25, #50 and #100 are used to denote the thickness of the tin plating. The size of the container is indicated by a measure of diameter and height of the container. These containers are lightweight and relatively inexpensive. If required, special protective coatings can be applied to the tin sheets prior to fabrication, so that the inside of the container will be protected against corrosion by the product. The coating can be of oleoresin, phenolic, vinyl or epoxy coating. The tin-plated steel containers (Figure 12.2) are generally used for topical aerosols.

Figure 12.2 Tin-plated Steel Containers