introduction
ISO (International Organization for Standardization) is a global federation of national standards bodies (ISO member bodies). The development of international standards is usually carried out through ISO technical committees. Each member group interested in a subject for which a technical committee has been established has the right to be represented on the Committee. International organizations, governments and non-governmental organizations in contact with ISO are also involved in this work. ISO works closely with the International Electrotechnical Commission (IEC) on all matters of electrical standardization.

The draft international standard adopted by the Technical Committee will be circulated to the member bodies for voting. Publication as an international standard requires approval by a vote of at least 75% of the member bodies.

The international standard ISO 8780-3 was developed by the ISO/TC 35 Technical Committee on Paints and Varnishes.

ISO 8780 consists of the following sections, under the general heading Pigments and increments – Dispersion methods for assessing dispersion properties:

ISO 8780-3-1990 “Dispersion methods for evaluating dispersion properties of pigments and fillers – Part 3: Dispersion using high speed impeller grinding”

– Part 1: Introduction

– Part 2: Dispersion using oscillators

– Part 3: Dispersion of grinding using high-speed impellers

– Part 4: Dispersion using a bead mill

– Part 5: Dispersion using an automatic grinder

– Part 6: Dispersion using a three-roll grinder

Appendix A forms an integral part of this part of ISO 8780.

1 Scope of Application
This part of ISO 8780 specifies a method for dispersing pigments and increments using a high-speed impeller grinder. It is used in conjunction with the assessment methods described in ISO 8781, using an agreed adhesive system. It should be read together with ISO 8780-1.

Note 1 A high-speed impeller mill can be used to completely or partially disperse the pigment as a preliminary to further dispersion using other equipment, such as a sander or bead mill or mill.

ISO 8780-3-1990 “Dispersion methods for evaluating dispersion properties of pigments and fillers – Part 3: Dispersion using high speed impeller grinding”

Due to high adhesive concentrations and/or high pigment concentrations resulting in high shear forces, this method is limited to moderately high viscosity abrasives. It is not intended to provide a method for formulating full-scale grinding base compositions (scaling up a process from laboratory equipment to a factory grinder is not simple).

2 Normative reference documents
The following standards contain provisions which, by reference herein, constitute the provisions of this part of ISO 8780. At the time of publication, the version shown is valid. All standards are subject to revision and parties to agreements based on this part of ISO 8780 are encouraged to investigate the possibility of applying new versions of the following standards. IEC and ISO members maintain a register of currently valid international standards.

ISO 842:1984, raw materials for paints and varnishes – Sampling.

ISO 8780-1:1990, pigments and increments – Dispersion methods for the assessment of dispersion properties – Part 1: Introduction.

ISO 8780-3-1990 “Dispersion methods for evaluating dispersion properties of pigments and fillers – Part 3: Dispersion using high speed impeller grinding”

ISO 8781-1:1990, pigments and increments – Methods for assessing dispersion properties – Part 1: Assessment against changes in tint strength of coloured pigments.

ISO 8781-2:1990, pigments and increments – Methods for assessing dispersion properties – Part 2: Assessment against changes in grinding fineness.

ISO 8781-3:1990 Pigments and increments – Methods for assessing dispersion properties – Part 3: Assessment from changes in gloss.

Only the standard information section is public. To see the full content, you need to purchase the standard through the official channels.