A government survey estimates that more than eight hundred thousands schools, office buildings and homes built from the 1940s to the 1970s contain some materials laced with asbestos. At the time, manufacturers used asbestos extensively because it was inexpensive, lightweight, durable and heat-resistant. Asbestos was a primary ingredient in pipe insulation, roofing shingles and floor tiles in many homes during the mid-twentieth century.
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