ASTMD724-99

Designation:D 724-99 (Reapproved 2003)An American National StandardINTERNATIONALStandard Test Method forSurface Wettability of Paper(Angle-of-Contact Method)1This standard is issued under the fixed designation D724;the number immediately following the designation indicates the year oforiginal adoption or,in the case ofrevision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon (e)indicates an editorial change since the last revision or reapproval.1.ScopeE 122 Practice for Choice of Sample Size to Estimate a1.1 This test method measures the angle of contact when aMeasure of Quality for a Lot or Processdrop of liquid is applied to the surface of a specimen of paper.2.2 TAPPI Standard:1.2 The measurement of both the initial angle of contact andTAPPI Test Method T 458 Surface wettability of paperthe angle of contact after a defined elapsed period of time may(angle of contact method)3be measured.1.3 A standard liquid (ink)for making measurements is3.Signifi cance and Usedescribed.3.1 This test method is useful in measuring the interaction1.4 Other liquids including printing inks,writing inks,of paper with liquids in a variety of applications.adhesives,oils,and coating materials may be used upon3.2 When using the standard ink described in this testagreement of those involved in the testing being done.method,the contact angle measured initially is often consid-1.5 Two types of apparatus for measuring the contact angleered a measure of the ruling quality of the paper.using the procedure in this test method are described.Addi-3.3 When using the same standard ink,the change in contacttional instruments that can perform the procedure in this testangle between the times specified in this test method,5 and 60method may also provide equivalent results.A different proce-s,is often considered a measure of writing quality of the paperdure using an automated instrument for measuring angle ofwhen an aqueous ink is used.contact will be found in Test Method D 57253.4 In many applications,a contact angle between 90 and1.6 The values stated in inch-pound units are to be regarded100 degrees,when a paper is tested with the standard ink,as the standard.The values given in parentheses are forindicates that the paper will be suitable for general activitiesinfommation onlywhere water-based inks are used.1.7 This standard does not purport to address all of the3.5 When this test method is used with specific non-safety concerns,if any,associated with its use.It is thestandard inks ofinterest,or non-aqueous liquids,the users mustresponsibility of the user of this standard to establish appro-agree in advance the data to be collected and how the data willpriate safety and health practices and determine the applica-be used.bility of regulatory limitations prior to use.3.6 Additional suggestions for more specifi c use of this testmethod will be found in Section 10.2.Referenced Documents2.1 ASTM Standards:24.ApparatusD 585 Pra