Designation: D5946 - 17 INTERNATIONAL Standard Test Method for Corona-Treated Polymer Films Using Water Contact Angle Measurements1 This standard is issued under the fixed designation D5946; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. 1. Scope* D724 Test Method for Surface Wettability of Paper (Angle of-Contact Method) (Withdrawn 2009)3 1.1 This test method covers measurement of the contact E691 Practice for Conducting an Interlaboratory Study to angleofwaterdropletsoncorona-treatedpolymerfilmsur- Determine the Precision of a Test Method faces. 2.2 ISO Standard:4 NoTE 1—This standard is identical to ISO 15989. ISO 15989 Plastics—Film and Sheeting—Measurement of 1.2ThevaluesstatedinSIunitsaretoberegardedasthe Water-Contact Angle of Corona-Treated Films standard. The values given in parentheses are for information only. 3. Terminology 1.3 This standard does not purport to address all of the 3.1 Definitions of Terms Specific to This Standard: safety concerns, if any, associated with its use. It is the 3.1.1 static contact angle, (degrees), n—the angle between responsibility of the user of this standard to establish appro- the substrate surface and the tangent line drawn to the droplet priate safety and health practices and determine the applica- surface at the three-phasepoint, when a liquid drop is resting bility of regulatory limitations prior to use. on a plane solid surface. 1.4 This international standard was developed in accor- 3.1.1.1 Discussion-Contact angle values can be deter- dance with internationally recognized principles on standard- minedasfollows:()byanalyzinganimageofadropletusing ization established in the Decision on Principles for the various projection or reflective devices andmeasuring the Development of International Standards, Guides and Recom- contact angle directly with a protractor by using tangential mendations issued by the World Trade Organization Technical alignment of a cursor line or the use of reference alignment BarrierstoTrade(TBT)Committee. procedures (Test Method D724); or (2) by analyzing an image of a droplet using various projection or reflective devices and 2. Referenced Documents measuring the height and width on the substrate surface to 2.1 ASTM Standards:2 calculate the contact angle as follows: D618 Practice for Conditioning Plastics for Testing = 2-arctan(H/R) (1) where: = contact angle, This test method is under the jurisdiction of ASTM Committee D20 on Plastics H = height of a droplet's image, and Molded Products. R = half its width. Current edition approved May 1, 2017. Published June 2017. Originally approved in 1996. Last previous edition approved in 2009 as D5946-09. DO1: 10.1520/D5946-17 2For referenced ASTM standards,visit the ASTM website, www.astm.org,or 3The last approved version of this historical standard is referenced on contact ASTM Customer Service at [email protected]. For Annual Book of ASTM www.astm.org. Standards volume information, refer to the standard's Document Summary page on 4Available from American National Standards Institute (ANSI),25 W.43rd St. the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org. *A Summary of Changes section appears at the end of this standard Copyright @ ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States 1 D5946-17 ent results on identical samples. Practical determination of a solid's surface energy uses this interaction of the solid with test liquids. 5.3 Although the level of surface treatment of polymer films has been traditionally defined in the industry in terms of dynes/cm (mN/m), these values are derived from a subjective interpretation of the observed test liquid behavior. 5.4 The following ranges of wat