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...