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ISO (Mezinárodní organizace pro normalizaci) je globální aliance národních normalizačních orgánů (členy ISO). Vývoj mezinárodních norem se obvykle provádí prostřednictvím technických komisí ISO. Každá členská instituce, která se zajímá o předmět, pro který byla ustavena technická komise, má právo být v této komisi zastoupena. Do této práce jsou zapojeny také mezinárodní vládní a nevládní organizace, které jsou ve spojení s ISO.

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.

Mezinárodní standard ISO 304 was developed by the Technical Committee ISO/TC91, Surfactants.

The second edition cancelled and replaced the first edition (ISO 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.

ISO 304-1985 “Stanovení povrchového napětí povrchově aktivní látky tažením tekutého filmu”

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

nicméně, in the case of surfactant solutions, measurements of this property do not allow any assumptions to be made about its decontamination, smáčivost, pěnění, emulsifying activity, atd. Ve skutečnosti, 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.

Poznámka – A number of methods have been established to determine surface tension, jako:

A) 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 — Slovní zásoba.

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

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