Freon canister

Figure 11.26 shows a component removed from an air-conditioning compressor. Pinhole perforations in this component had allowed cooling water to leak into the freon. Many failures of this type had occurred previously. Examinations of the internal surfaces of both the canister and the tubes entering it revealed evidence of metal loss. Tiny perforations at the bases of deep grooves were noted in the tubes. Deep, general, smooth metal loss surrounded irregular islands of intact surface (Fig. 11.27). The canister walls displayed a similar metal loss and comet-tail-shaped depressions (Fig. 11.2).

There is a wide range of personal care and household products packaged in the form of aerosol spray cans. These self-pressurized canisters use a propellant and a valve/atomizer to deliver a liquid aerosol. The original perfume aerosol products (circa 1903) used a CO2 propellant. The first insecticide aerosol product was developed for military use during World War II and used Freon as the propellant. The military version was called the bug bomb, and the first commercial version (1947) was called Jet [40]. Jet appears to also have been the first commercial pressurized aerosol spray product. Within a few years a number of other aerosol spray products appeared in the marketplace, including deodorants, perfumes, suntan enhancers, paints and lacquers [40]. Other modern commercial aerosol... 

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