This part of ISO 16532 specifies a method for the determination of the grease resistance of paper and board. It provides an accelerated comparison of the relative rates at which oils or greases, such as those commonly found in foodstuffs, can be expected to penetrate voids in papers such as greaseproof or glassine, where the grease or oil resistance is provided by mechanical means only. It is not applicable to grades of paper or board that are given grease or oil resistance by means of a coating or internal treatment for which ISO 16532-1 or ISO 16532-2 apply.