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ISO (International Organization para sa Standardisasyon) ay isang pandaigdigang alyansa ng mga pambansang pamantayan katawan (Mga katawan ng miyembro ng ISO). Ang pagbuo ng mga internasyonal na pamantayan ay karaniwang isinasagawa sa pamamagitan ng ISO teknikal na komite. Ang bawat institusyon ng miyembro na interesado sa isang paksa kung saan itinatag ang isang teknikal na komite ay may karapatang kumatawan sa komiteng iyon. Ang mga internasyonal na organisasyon ng pamahalaan at di pamahalaan na nakikipag ugnayan sa ISO ay kasangkot din sa gawaing ito.

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.

The international standard ISO 304 was developed by the Technical Committee ISO/TC91, Mga Surfactant.

Ang ikalawang edisyon ay kinansela at pinalitan ang unang edisyon (ISO 304-1978), na kung saan ay isang menor de edad na rebisyon.

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 “Pagpapasiya ng pag igting ng ibabaw ng surfactant sa pamamagitan ng pagguhit ng likidong pelikula”

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

Gayunpaman, in the case of surfactant solutions, measurements of this property do not allow any assumptions to be made about its decontamination, wettability, foaming, emulsifying activity, atbp. 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.

Tala – A number of methods have been established to determine surface tension, tulad ng:

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 Mga Materyal na Sanggunian
ISO 862, Mga Surfactant — Bokabularyo.

ISO 2456, Mga Surfactant – Water used as a test solvent.

Ang standard information section lamang ang pampubliko. Upang makita ang buong nilalaman, kailangan mong bilhin ang pamantayan sa pamamagitan ng mga opisyal na channel.