Aerosol products have a wide range of applications in today's
world. These applications include shaving creams,
hairsprays, antiperspirant sprays, perfumes and colognes,
skin care aerosols, insecticides, furniture polishes, paints,
laundry aids, air fresheners, home insulation aerosols,
and food products. However, there is one class of aerosol
products that requires special consideration since their
application and technology are significantly different
from those of the general consumer aerosol products. This
special class of products comprises pharmaceutical, pressurised,
metered dose inhalers (MDIs), which are used to
deliver life-saving medication to millions of people for the
treatment of asthma and chronic obstructive pulmonary
disease (COPD).