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 8780-2 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 8780-2-1990 “Dispersion methods for evaluating dispersion properties of pigments and fillers – Part 2: Dispersion using vibrators”

– 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 shaking bed. The method is suitable for the preparation of multi-sample dispersion in pigment quality control. This part is used in conjunction with the assessment methods described in ISO 8781, using an agreed low viscosity adhesive system. It should be read together with ISO 8780-1.

Note 1: The advantage of the oscillatory shaking method is that several batches of small amounts of abrasive can be tested simultaneously in a closed system with minimal solvent loss.

ISO 8780-2-1990 “Dispersion methods for evaluating dispersion properties of pigments and fillers – Part 2: Dispersion using vibrators”

This method is limited to low-viscosity grinding substrates that allow the ball to move freely (see 7.1). It is not suitable for optimizing paste formulations for other dispersion technologies.

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 787-10:1981, General test methods for pigments and increments-Part 10: Determination of density – pyronometer method.

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 8780-2-1990 “Dispersion methods for evaluating dispersion properties of pigments and fillers – Part 2: Dispersion using vibrators”

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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