254Specific Components
Paints and Coatings
A major source of man-made VOCs are coatings, especially paints and protective
coatings. Solvents are required to spread a protective or decorative film. Approximately
12 billion liters of paints are produced annually. Typical solvents are aliphatic
hydrocarbons, ethyl acetate, glycol ethers, and acetone. Motivated by cost, environmental
concerns, and regulation, the paint and coating industries are increasingly shifting toward
aqueous solvents.
Chlorofluorocarbons and Chlorocarbons
Chlorofluorocarbons, which are banned or highly regulated, were widely used cleaning
products and refrigerants. Tetrachloroethene is used widely in dry cleaning and by
industry. Industrial use of fossil fuels produces VOCs either directly as products (e.g.,
gasoline) or indirectly as byproducts (e.g., automobile exhaust).
Benzene
One VOC that is a known human carcinogen is benzene, which is a chemical found in
environmental tobacco smoke, stored fuels, and exhaust from cars in an attached garage.
Benzene also has natural sources such as volcanoes and forest fires. It is frequently used
to make other chemicals in the production of plastics, resins, and synthetic fibers. Benzene
evaporates into the air quickly and the vapor of benzene is heavier than air allowing the
compound to sink into low-lying areas.
Benzene has also been known to contaminate food and water and if digested can lead to
vomiting, dizziness, sleepiness, rapid heartbeat, and at high levels, even death may occur.
Methylene Chloride
Methylene chloride is another VOC that is highly dangerous to human health. It can be
found in adhesive removers and aerosol spray paints and the chemical has been proven
to cause cancer in animals. In the human body, methylene chloride is converted to carbon
monoxide and a person will suffer the same symptoms as exposure to carbon monoxide.
If a product that contains methylene chloride needs to be used the best way to protect
human health is to use the product outdoors. If it must be used indoors, proper ventilation
is essential to keeping exposure levels down.
Perchloroethylene
Perchloroethylene is a volatile organic compound that has been linked to causing cancer
in animals. It is also suspected to cause many of the breathing related symptoms of
exposure to VOC’s. Perchloroethylene is used mostly in dry cleaning.
Studies show that people breathe in low levels of this VOC in homes where dry-cleaned
clothes are stored and while wearing dry-cleaned clothing. While dry cleaners attempt to
recapture perchlorothylene in the dry cleaning process to reuse it in an effort to save
money, they can’t recapture it all.
To avoid exposure to perchlorothylene, if a strong chemical odor is coming from clothing
when picked up from the dry cleaner, do not accept them and request that less of the
chemical be used as well as a complete drying of the garments