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 8780-6 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 8780-6-1990 “Dispersion methods for evaluating dispersion properties of pigments and fillers – Part 6: Dispersion using a three-roll mill”

– 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 three-roll grinder. The results allow conclusions to be drawn about the behavior of the test product when dispersed using the corresponding production machine. This part of ISO 8780 is used in conjunction with the evaluation methods described in ISO 8781, using an agreed system of high viscosity adhesives that do not contain volatile substances. It should be read together with ISO 8780-1.

This method is limited to high viscosity abrasives. In order to improve the precision of the method, it is suggested that the dispersion procedure of the test pigment and the conventional reference pigment should be carried out at the same temperature.

ISO 8780-6-1990 “Dispersion methods for evaluating dispersion properties of pigments and fillers – Part 6: Dispersion using a three-roll mill”

The results obtained are not suitable for comparison with the dispersion results obtained using other dispersion methods.

Note 1 The advantages of the three-high mill described in this section of ISO 8780 are ease of handling the equipment, the ability to prepare a sufficient amount of abrasive for a wide range of evaluation procedures, ease of cleaning and the possibility of associated results with the results of the production machinery. Unlike dispersion equipment used for low-viscosity abrasive formulations, three-roll grinders such as those described in this part of ISO 8780 allow processing of a wide range of high-viscosity abrasive formulations. Because of this greater flexibility, it is not necessary to precisely specify the appropriate color paste formula.

ISO 8780-6-1990 “Dispersion methods for evaluating dispersion properties of pigments and fillers – Part 6: Dispersion using a three-roll mill”

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 787-24:1985, General test methods for pigments and increments – Part 24: Determination of the relative tinting force of coloured pigments and the relative scattering force of white pigments – Photometric method.

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

ISO 1524:1983, Paints and varnishes – Determination of fineness of grinding.

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

ISO 8780-6-1990 “Dispersion methods for evaluating dispersion properties of pigments and fillers – Part 6: Dispersion using a three-roll mill”

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.

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