Steel is the most common material for spring washers due to its ease of process and its high tensile strength. Chrome vandium alloy is a higher quality steel with a good through-hardening capability; it is used to make very thick spring washers.
How to Prevent Swimmerâs Itch. Thereâs no cure-all to eliminate swimmerâs itch. The negative symptoms are, ironically, a problem of our own immune systemâs making, and short of abstaining from swimming altogether, thereâs a risk of getting swimmerâs itch in a Northern Michigan lake.
Follow these guidelines whenever you're swimming, and the odds of drowning will decrease dramatically: Don't swim alone. Always go swimming with one other person who is a strong swimmer, if not several other people. An area with a lifeguard is usually a best place to swim. Don't start out swimming in moving water. If you're learning to swim in an ocean or river, you'll need to be more aware of the motion of the water.