BSI 19/30382560 DC:2019 Edition
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BS ISO 1409. Plastics/rubber. Polymer dispersions and rubber latices (natural and synthetic). Determination of surface tension
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 18 |
This document specifies two methods for the determination of the surface tension of polymer dispersions and rubber latices (natural and synthetic).
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Method A is the ring method (Du Noüy ring method).
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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. To achieve this, the dispersion or latex is diluted with water to a mass fraction of total solids of 40 %. If necessary, the solids content is further reduced to ensure that the viscosity is under the specified limit.
Method B is not suitable for polymer dispersions and rubber latices containing cationic surfactants.
Methods A and B are also suitable for prevulcanized latices and compounded material.
In case of dispute, the preferred method is method A (the ring method).
