предговор
ИСО (Међународна организација за стандардизацију) је глобални савез националних тела за стандардизацију (Тела чланица ИСО). Развој међународних стандарда се обично спроводи преко ИСО техничких комитета. Свака институција чланица заинтересована за предмет за који је основан технички комитет има право да буде заступљена у тој комисији. Међународне владине и невладине организације које су у вези са ИСО такође су укључене у овај посао.

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.

Међународни стандард ИСО 304 was developed by the Technical Committee ISO/TC91, Surfactants.

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

ИСО 304-1985 “Determination of surface tension of surfactant by drawing liquid film”

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

Међутим, in the case of surfactant solutions, measurements of this property do not allow any assumptions to be made about its decontamination, влажење, пенушање, emulsifying activity, итд. In fact, 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.

Белешка – A number of methods have been established to determine surface tension, као такав:

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

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

ц) maximum ball pressure method;

d) falling weight method;

e) Drop or handless ball method;

ф) suspension droplet method;

г) 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 Референтни материјали
ИСО 862, Surfactants — Vocabulary.

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

Јаван је само одељак са стандардним информацијама. Да бисте видели цео садржај, морате купити стандард преко званичних канала.