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

International standards are drafted in accordance with the rules given in Part 3 of the ISO/IEC Directive.

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 at least 75% of member institutions.

Please note that certain elements of this part of ISO 14680 May be the subject of a patent right. ISO is not responsible for identifying any or all such patents.

The international standard ISO 14680-3 was developed by Technical Committee ISO/TC 35, Paints and Varnishes, Sub-Committee SC 9, General Test Methods for paints and varnishes.

ISO 14680-3-2000 – Determination of pigment content in paints and varnishes – Part 3: Filtration method

ISO 14680 consists of the following parts, under the general heading Paints and varnishes – Determination of pigment content:

– Part 1: Centrifugal method

– Part 2: Ashing methods

– Part 3: Filtering methods

1 Range
This part of ISO 14680 is one of a series of standards dealing with the sampling and testing of paints, varnishes and related products.

It specifies a method for determining the pigment content of a paint by adding a solution of potassium hydroxide to solidify the pigment and filter out the resulting solids. The method is particularly suitable for coating materials containing carbon black, extremely subdivided silica, extremely subdivided titanium dioxide, organic pigments or polymer dispersions. It is not suitable for many water-diluted coatings because the entire adhesive will condense when a potassium hydroxide solution is added.

The pigment content of the coating material can also be determined by centrifugal method (see ISO 14680-1) or ashing method (see ISO 14680-2).

ISO 14680-3-2000 – Determination of pigment content in paints and varnishes – Part 3: Filtration method

2 Normative references
The following normative documents contain provisions that, by reference herein, constitute the provisions of this part of ISO 14680. For dated references, any subsequent revisions or amendments to these publications will not apply. However, Parties to an agreement based on this part of ISO 14680 are encouraged to investigate the possibility of applying new versions of the following normative documents. For undated references, a new version of the standard-setting document referred to applies. ISO and IEC members maintain a register of currently valid international standards.

ISO 1513-1992, Paints and varnishes. Examination and preparation of test samples.

ISO 15528:-1), paints, varnishes and raw materials for paints and varnishes – Sampling.

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