Q.1033:  How is paper made waterproof?

Ans. Paper can be made waterproof or water resistant by one of the following methods, depending on the end use.

  1. By heavily beating the pulp and forming a compact and dense sheet which will resist water or other fluid penetration. e.g. Greaseproof paper
  2. By coating with a  waterproof material layer. e.g. wax paper
  3. By lamination with a waterproof material film such as plastic or aluminum. e.g. Aluminum Foil Paper
  4. By soaking paper in chemical such as  mineral oil.

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