Grease resistance of paper or board with the KIT test

In this test, the grease resistance of paper is evaluated using castor oil, n-heptane, and toluene mixtures as per the TAPPI 559 standard.

A drop of the test liquid is dropped on the paper, and after 15 seconds the drop is wiped off. If the paper is darkened by the oil (i.e. the oil has penetrated the paper), the test is considered as failed and a lower KIT mixture is tested. The result will be given as the number of the first KIT liquid that passes this evaluation.