前言
国际标准化组织 (国际标准化组织) 是国家标准机构的全球联盟 (ISO成员机构). 国际标准的制定通常通过ISO技术委员会进行. 每个对已成立技术委员会的主题感兴趣的成员机构都有权在该委员会中派代表参加. 与 ISO 联络的国际政府和非政府组织也参与了这项工作.

技术委员会通过的国际标准草案在被 ISO 理事会接受为国际标准之前，将分发给成员机构批准. They are approved under the ISO process, which requires at least 75 per cent approval from voting member bodies.

国际标准ISO 304 was developed by the Technical Committee ISO/TC91, 表面活性剂.

第二版取消并取代第一版 (国际标准化组织 304-1978), which was a minor revision.

Users should note that, unless otherwise noted, all international standards are revised from time to time, and unless otherwise noted, any reference herein to any other international standard is meant to be the latest version.

国际标准化组织 304-1985 “拉液膜法测定表面活性剂的表面张力”

介绍
Surface tension is a basic property of liquids in general, especially surfactant aqueous solutions.

然而, in the case of surfactant solutions, measurements of this property do not allow any assumptions to be made about its decontamination, 润湿性, 起泡, emulsifying activity, ETC. 实际上, no relationship can be established between the properties of the surfactant and the surface tension of the solution.

1 Scope and domain of application
This standard specifies a test method for determining the surface tension of surfactants and aqueous or organic solutions containing one or more surfactants by drawing liquid membranes.

It is also suitable for surface tension measurement of pure liquids or solutions other than those described above.

笔记 – A number of methods have been established to determine surface tension, 例如:

A) Method of drawing liquid film by plate, stirrup or ring:

乙) Methods for measuring the rise of liquid in capillary tubes;

C) maximum ball pressure method;

d) falling weight method;

e) Drop or handless ball method;

F) suspension droplet method;

G) Dynamic method based on flow characteristic measurement;

H) Methods for studying waves generated in capillary jets.

The draw-based liquid film approach has significant advantages in terms of simple procedures and commercial availability of highly automated equipment.

2 参考资料
国际标准化组织 862, 表面活性剂 — 词汇.

国际标准化组织 2456, 表面活性剂 – Water used as a test solvent.

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