Standard Test Method for Surface Wettability of Paper (Angle-of-Contact Method) (Withdrawn 2009)
3.1 This test method is useful in measuring the interaction of paper with liquids in a variety of applications.
3.2 When using the standard ink described in this test method, the contact angle measured initially is often considered a measure of the ruling quality of the paper.
3.3 When using the same standard ink, the change in contact angle between the times specified in this test method, 5 and 60 s, is often considered a measure of writing quality of the paper when an aqueous ink is used.
3.4 In many applications, a contact angle between 90 and 100 degrees, when a paper is tested with the standard ink, indicates that the paper will be suitable for general activities where water-based inks are used.
3.5 When this test method is used with specific non-standard inks of interest, or non-aqueous liquids, the users must agree in advance the data to be collected and how the data will be used.
3.6 Additional suggestions for more specific use of this test method will be found in Section 10.
1.1 This test method measures the angle of contact when a drop of liquid is applied to the surface of a specimen of paper.
1.2 The measurement of both the initial angle of contact and the angle of contact after a defined elapsed period of time may be measured.
1.3 A standard liquid (ink) for making measurements is described.
1.4 Other liquids including printing inks, writing inks, adhesives, oils, and coating materials may be used upon agreement of those involved in the testing being done.
1.5 Two types of apparatus for measuring the contact angle using the procedure in this test method are described. Additional instruments that can perform the procedure in this test method may also provide equivalent results. A different procedure using an automated instrument for measuring angle of contact will be found in Test Method D 5725
1.6 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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