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