Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 2431 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes.

This fifth edition cancels and replaces the fourth edition (ISO 2431:1993), which has been technically revised. It also incorporates the Technical Corrigenda ISO 2431:1993/Cor.1:1994 and ISO 2431:1993/Cor.2:1999.

The main technical changes are as follows:

a) the curves in Figures 2 to 5 have been placed in a single figure (Figure 2) and the equations for the conversion of flow time to kinematic viscosity and vice versa represented by the curves in these figures have been moved from the figures to a table (Table 1);
b) the accuracy of the stopwatch used is no longer specified;
c) a clause has been added describing the marking of products tested to indicate the results of the test;
d) the procedure for checking the flow cups for wear and tear has been revised to include two alternative methods (one using a certified reference material or secondary working standard, the other using a certified flow cup) and has been moved to an informative annex;
e) the former Annex A on the use of flow cups for the adjustment of paint consistency has been deleted;
f) a new annex describing the conversion of flow times from one temperature to another has been added.

BS EN ISO 2431:2011

Paints and varnishes. Determination of flow time by use of flow cups

Published:

31 Dec 2011

Withdrawn:

19 Jul 2019