It seems thousands of United States homeowners claim that they are becoming sick as a result of defective Chinese drywall, claiming a “rotten egg” odor; headaches; nausea and vomiting; respiratory problems; and corrosion of metals in the home, including of jewelry, wiring, air conditioning units, and other appliances.
The Daily Herald points out that millions of gypsum sheets imported to the United States during the housing boom appear to have been contaminated with an array of sulfur compounds. The gypsum in drywall, which typically comes from mines, has recently come from a chemical process involving lime or limestone and gas from coal-fired power plants. Contaminants and sulfur found in power plant smokestacks are supposed to be removed in the process. Failure of proper removal is the cause of foul odors, respiratory complaints, and corrosion, according to some Chinese experts in building supplies. Others say phosphogypsum (calcium sulfate), a radioactive phosphorus substance, is to blame. Banned for use in U.S. construction in 1989, the Environmental Protection Agency (EPA) says prolonged exposure to this radium-contained element can lead to a higher risk of lung cancer. (more…)

