1.1 本试验方法包括在空气中测量聚乙烯或聚丙烯薄膜表面与特定试验溶液滴接触的润湿张力。 1.2 以国际单位制表示的值应视为标准值。括号中给出的值是英寸-磅单位的数学转换，仅供参考，不被视为标准值。 注1: 本试验方法和指定试剂是专门为聚乙烯和聚丙烯薄膜开发的。对于由其他聚合物组成的膜，可以使用该测试方法和指定的试剂，但这会影响气液界面和固液界面的表面能，从而影响接触角和润湿张力。用户必须确定使用非聚烯烃材料的适用性和重要性。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。第节中给出了具体危害说明 9 . 注2: 该测试方法等同于ISO 8296. 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 当一滴液体停留在固体表面上，而气体与两者接触时，作用在界面上的力必须平衡。 这些力可以用作用于表面方向的表面能表示，如下所示: 哪里: θ = 液滴边缘与固体表面的接触角， γGL = 气体表面能 - 液体界面， γ-GS（γ-GS） = 气体表面能 - 固体界面，以及 γSL = 固体表面能 - 液体界面。 5.1.1 上述方程的右侧（气体表面能之间的差值 - 固体和固体 - 液体界面）定义为固体表面的润湿张力。它不是表面的基本性质，而是取决于固体和特定环境之间的相互作用。 5.1.2 当气体被液体蒸汽饱和时，γ 全球定位系统 将是液体的表面张力。如果接触角为0°，则液体只是润湿固体表面，在这种特殊情况下（因为cosθ = 1） 固体的润湿张力将等于液体的表面张力。 5.2 聚乙烯和聚丙烯薄膜保留油墨、涂层、粘合剂等的能力主要取决于其表面的特性，可通过几种表面处理技术之一加以改善。已经发现，这些相同的处理技术增加了在空气存在下与甲酰胺和乙基纤维素溶剂的混合物接触的聚乙烯或聚丙烯膜表面的润湿张力。因此，可以将聚乙烯或聚丙烯薄膜表面的润湿张力与其接受和保持油墨、涂层、粘合剂等的能力联系起来。通过经验，特定薄膜表面的测量润湿张力只能与可接受的油墨、涂层或粘合剂保持相关。润湿张力本身不是油墨、涂层或粘合剂附着力的完全可接受的测量方法。 注3: 通常发现，35达因/厘米或更高的润湿张力显示了通常被视为可接受的用于商业柔性版印刷的由1型聚乙烯制成的管状膜的处理程度。然而，可能需要一些其他水平的润湿张力，以指示由其他工艺制成的聚乙烯膜或由其他类型的聚乙烯制成的聚乙烯薄膜或用于其他用途的聚乙烯薄膜的可接受性。 目前，尚未获得足够的经验来说明商业柔性版印刷用聚丙烯膜的润湿张力的一般可接受水平。

1.1 This test method covers the measurement of the wetting tension of a polyethylene or polypropylene film surface in contact with drops of specific test solutions in the presence of air. 1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to inch-pound units that are provided for information only and are not considered standard. Note 1: This test method and the specified reagents were specifically developed for polyethylene and polypropylene films. It is possible to utilize this test method and the specified reagents for films composed of other polymers, but this can affect the surface energies of the gas-liquid and solid-liquid interfaces, which will affect the contact angle and wetting tension. The applicability and significance for use of non-polyolefin materials must be established by the user. 1.3 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazards statements are given in Section 9 . Note 2: This test method is equivalent to ISO 8296. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 When a drop of liquid rests on the surface of a solid, and a gas is in contact with both, the forces acting at the interfaces must balance. These forces can be represented by surface energies acting in the direction of the surfaces and it follows that: where: θ = angle of contact of the edge of the drop with the solid surface, γGL = surface energy of the gas - liquid interface, γGS = surface energy of the gas - solid interface, and γSL = surface energy of the solid - liquid interface. 5.1.1 The right side of the above equation (the difference between the surface energies of the gas - solid and solid - liquid interfaces) is defined as the wetting tension of the solid surface. It is not a fundamental property of the surface but depends on interaction between the solid and a particular environment. 5.1.2 When the gas is air saturated with vapors of the liquid, γ GL will be the surface tension of the liquid. If the angle of contact is 0° the liquid is said to just wet the surface of the solid, and in this particular case (since cos θ = 1) the wetting tension of the solid will be equal to the surface tension of the liquid. 5.2 The ability of polyethylene and polypropylene films to retain inks, coatings, adhesives, etc., is primarily dependent upon the character of their surfaces, and can be improved by one of several surface-treating techniques. These same treating techniques have been found to increase the wetting tension of a polyethylene or a polypropylene film surface in contact with mixtures of formamide and ethyl Cellosolve in the presence of air. It is therefore possible to relate the wetting tension of a polyethylene or a polypropylene film surface to its ability to accept and retain inks, coatings, adhesives, etc. The measured wetting tension of a specific film surface can only be related to acceptable ink, coating, or adhesive retention through experience. Wetting tension in itself is not a completely acceptable measure of ink, coating, or adhesive adhesion. Note 3: A wetting tension of 35 dynes/cm or higher has been generally found to reveal a degree of treatment normally regarded as acceptable for tubular film made from Type 1 polyethylene and intended for commercial flexographic printing. It is, however, possible that some other level of wetting tension may be required to indicate the acceptability of polyethylene films made by other processes, or from other types of polyethylene, or intended for other uses. At the present date, insufficient experience has been gained to state a generally acceptable level of wetting tension for polypropylene films for commercial flexographic printing.