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. As an international publication! The standard requires at least 75% of the member groups to vote for approval.

The international standard ISO 8780-4 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:

– 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 G: Dispersion using a three-roll grinder

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

ISO 8780-4-1990 “Dispersion methods for evaluating dispersion properties of pigments and fillers – Part 4: Dispersion using a bead mill”

1 Scope of Application
This part of ISO 8780 specifies a method for dispersing pigments and increments using a bead mill. It is used in conjunction with the evaluation methods described in ISO 8781, using an agreed low viscosity adhesive system. It should be read together with ISO 8780-1.

The method is limited to low and medium viscosity abrasives that allow the ball to move freely (see Article 7). It is therefore suitable for pastes with a viscosity higher than the dispersion method described in ISO 8780-2.

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 8780-4-1990 “Dispersion methods for evaluating dispersion properties of pigments and fillers – Part 4: Dispersion using a bead mill”

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

ISO 2431:1984, Paints and varnishes – Determination of flow time using a flow cup.

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

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.

ISO 8780-4-1990 “Dispersion methods for evaluating dispersion properties of pigments and fillers – Part 4: Dispersion using a bead mill”

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