Learning Objectives

• General requirements of aerosol containers
• Various materials used in the construction of an aerosol container, their merits and demerits

The selection of container for a particular aerosol product depends on its ability to adapt to production method, compatibility with the formulation, aesthetic appeal and cost. More importantly, the aerosol container should be able to withstand pressure as high as 140 to 180 psig at 130°F. The aerosol containers are usually made of metal, glass or plastic. They are generally given a coating of plastic to improve safety characteristics of glass containers, corrosion resistance of metal containers and stability of formulations.

In most of the aerosol cans, the bottom curves inward. This helps to serve the following two purposes:

1. In containers with a flat bottom, the force of the pressurized gas might push the metal outward. A curved bottom gives the can greater structural integrity.
2. The curved shape makes it easier to use up the entire product.

Aerosol containers can be classified as follows:

1. Metal
   1. Tin-plated steel
   2. Tin-free steel
   3. Aluminum
   4. Stainless steel
2. Glass
   1. Uncoated glass
   2. Plastic-coated glass