BS ISO 1409:2020 pdf free.Plastics/rubber一Polymer dispersions and rubber latices (natural and synthetic)- Determination of surface tension.
BS ISO 1409  This document specifies two methods for the determination of the surface tension of polymer dispersions and rubber latices (natural and synthetic).Method A is the ring method (Du Noiy ring method).一Method B is the plate method (Wilhelmy plate method).Method A is suitable valid for polymer dispersions and rubber latices with a viscosity less than 200 mPa-s.Method B is not suitable for polymer dispersions and rubber latices containing cationic surfactants.Methods A and B are also suitable for revulcanized latices and compounded material.In case of dispute, the preferred method is method A (the ring method).2 Normative references.The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 123, Rubber latex一Sampling ISo 124, Latex, rubber一Determination of total solids content IS0 705, Rubber latex一Determination of density between 5 degrees C and 40 degrees C IS0 1652, Rubber latex一Determination of apparent viscosity by the Brookfield test method IS0 2555, Plastics一Resins in the liquid state or as emulsions or dispersions一Determination of apparent viscosity using a single cylinder type rotational viscometer method IS0 3219, Plastics一Polymers/resins in the liquid state or as emulsions or dispersions一Determination of viscosity using a rotational viscometer with defined shear rate 4.1 Method A Method A is suitable valid for polymer dispersions and rubber latices with a viscosity less than 200 mPa-s. To achieve this, the dispersion or latex is diluted with water to a mass fraction of total solids of 40 %. If necessary, the total solid content is further reduced to ensure that the viscosity is under the specified limit.A horizontally suspended ring of thin wire is attached to a “Du Nouy type” tensiometer and immersed in the liquid under test, then slowly pulled out. Just before the ring detaches itself from the surface of the liquid, the force required reaches a maximum. This force is measured by a torsion balance, inductive pick-up or some other suitable measuring device.4.2 Method B. When a liquid is brought into contact with the edge of the plate which is suspended from the “Wilhelmy type” tensiometer, the plate is pulled down into the liquid due to the surface tension. The instrument applies an upward vertical force to the plate so that the plate reaches the force balance. This vertical force is measured and used to calculate the surface tension of the liquid.BS ISO 1409 pdf download.