Testing                                                                                                                                                           OIL ABSORBENCY

Oil Absorbency

Outline of the Method

This method consists of measuring the time in which a drop of castor oil produces a uniform translucent spot in paper. It is a measure of the receptivity of paper to printing inks having an oil vehicle, but is suitable only for easily permeable papers, such as news, book and mimeograph.

Apparatus

Viewing Box - Having an open front a ground-glass top with a 20 mm hole for observing the specimen, a ground-glass partition parallel to the front side to prevent excess heat from affecting the test results, a 15-watt electric bulb placed at the back of the partition for illuminating the specimen and an adjustable mirror near the bottom of the box and centred on the observation hole in the top of the box.

Separatory Funnel - With a tip approximately 20 mm in length and of such diameter that 25 drops of distilled water delivered at 21°C will have a volume of 1 ml. The funnel is suspended with the end of the tip approximately 45 mm above the test specimen and contains castor oil, the temperature of which is maintained at 27±2° C during the test.

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