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If you work on a construction crew, repair or service automobiles, appliances or electronics; manufacture batteries or radiators; melt, cast or grind lead, brass or bronze; build or tear down buildings or bridges; or work with scrap metal, you might be exposed to dangerous amounts of lead. Short-term exposure can cause headaches, irritability, memory loss and abdominal pain. Prolonged exposure can increase your risk of high blood pressure, heart disease and kidney problems. To protect yourself from toxic chemicals, always wear rubber gloves when handling scrap or other hazardous materials. Wash your hands thoroughly after handling scrap or other hazardous materials and avoid touching your face, eyes and mouth.
There are a number of different types of washers, each designed for specific applications. One of the most common is a spring washer, which has raised ends that produce a tension that helps prevent nuts or bolts from loosening over time. Another type is a torque washer, which has square holes and pointy forks evenly spaced around its circumference. When a nut or bolt tightens a torque washer, the forks bite into the material to prevent the nut or bolt from spinning.
A phenolic washer, also called a cellulose washer or Mylar washer, is made from sheets of a phenolic resin and is used to provide electrical insulation. The phenolic material is lightweight, tough and has low moisture absorption, making it resistant to corrosion. It can be used in place of flat metallic washers in situations where the environment is too cold or corrosive for the use of metal washers.