AS 4784-2003 (R2016)

Table of Contents

Abstract

Sets out procedures for wetting a powder into a liquid, deagglomerating the wetted clumps, determining if solution composition can be adjusted to prevent reagglomeration, selecting dispersing agents to prevent reagglomeration and evaluating the stability of the dispersion against reagglomeration. This Standard is applicable to particles ranging in size from approximately 0.05 to 100 µm. This Standard is identical with and has been reproduced from ISO 14887:2000.
RECONFIRMATION NOTICE
Technical Committee NT-001 has reviewed the content of this publication and in
accordance with Standards Australia procedures for reconfirmation, it has been
determined that the publication is still valid and does not require change.
Certain documents referenced in the publication may have been amended since the
original date of publication. Users are advised to ensure that they are using the latest
versions of such documents as appropriate, unless advised otherwise in this
Reconfirmation Notice.
Approved for reconfirmation in accordance with Standards Australia procedures for
reconfirmation on 9 September 2016.
The following are represented on Technical Committee NT-001:
Accord Australasia
Australasian College of Toxicology & Risk Assessment
Australian Industry Group
Australian Solar Council
Consumers Federation of Australia
CSIRO
Engineers Australia
National Association of Testing Authorities Australia
National Industrial Chemical Notification and Assessment Scheme
National Measurement Institute
Safe Work Australia
Safety Institute of Australia
University of Adelaide

Scope

This International Standard was developed to help particle size analysts make good dispersions from powder/liquid combinations with which they are not experienced. It provides procedures for
- wetting a powder into a liquid;
- deagglomerating the wetted clumps;
- determining if solution composition can be adjusted to prevent reagglomeration;
- selecting dispersing agents to prevent reagglomeration;
- evaluating the stability of the dispersion against reagglomeration.
This International Standard is applicable to particles ranging in size from approximately 0,05 to 100 µm. It provides a series of questions on the nature of the powder and liquid involved. The answers are used with charts that guide the user to generic dispersing agents that are likely to be suitable for dispersing the powder in the liquid.
This International Standard applies only to the preparation of simple, dilute dispersions (less than 1 % by volume solids) for particle size analysis. It does not deal with the formulation of complex and commercial mixtures highly loaded with solids, such as paints, inks, pharmaceuticals, herbicides and composite plastics.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Standards Australia
ProductNote	Reconfirmed 23/09/2016. This standard has been reconfirmed in Australia in 2016 and remains current in New Zealand. Reconfirmation Notice 23/09/2016
Pages
ISBN
Committee	CH-032
Supersedes	DR 02330 CP