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TAPPI T 462 cm-06
Castor-oil penetration test for paper (corrected copy)
This Classical Method is used to measure the absorbency rate of paper for printing inks having an oil vehicle. It is normally used only for easily permeable papers such as news, book, and mimeograph (1,2); however, it can be helpful for any paper where the absorbency of an oil based vehicle is important.
Technical Association of the Pulp and Paper Industry [tappi]