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Design for degradation means designing a product so that after use it

  • A.can be returned to the manufacturer
  • B.breaks down into innocuous substances
  • C.persists unchanged in the environment
  • D.can be incinerated without residue

Answer: B

Correct answer: breaks down into innocuous substances

The principle asks that persistence be designed out: at the end of its useful life the product should degrade to harmless materials rather than accumulate. The difficulty is that stability during use and degradability afterwards pull against each other, so the design problem is to place the transition at the right point.

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