序文
ISO (国際標準化機構) 国家標準化団体の世界的な同盟です (ISO会員団体). 国際規格の開発は通常、ISO 技術委員会を通じて行われます。. 技術委員会が設立された主題に関心を持つ各加盟機関は、その委員会に代表される権利を有する。. ISO と連携する国際政府および非政府組織もこの作業に関与しています。.

Draft international standards adopted by technical committees are circulated to member bodies for approval before being accepted as international standards by the ISO Council. They are approved under the ISO process, which requires at least 75 per cent approval from voting member bodies.

国際規格ISO 304 was developed by the Technical Committee ISO/TC91, Surfactants.

第 2 版はキャンセルされ、初版と置き換わりました (ISO 304-1978), それはマイナーな改訂でした.

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.

ISO 304-1985 “液膜の描画による界面活性剤の表面張力の測定”

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

しかし, in the case of surfactant solutions, measurements of this property do not allow any assumptions to be made about its decontamination, 濡れ性, 発泡, emulsifying activity, 等. 実際には, 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.

注記 – A number of methods have been established to determine surface tension, のような:

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

b) 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 Reference Materials
ISO 862, Surfactants — 語彙.

ISO 2456, Surfactants – Water used as a test solvent.

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