preface
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 electrotechnical standardization.

International standards are drafted in accordance with the rules given in Part 2 of the ISO/IEC Directive.

The main task of the technical committee is to set international standards. The draft international standards adopted by the Technical Committee will be circulated to member bodies for voting. Publication as an international standard requires approval by at least 75% of member bodies.

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ISO 15715 was developed by Technical Committee ISO/TC 35, Paints and Varnishes, Subcommittee SC 10, Methods of Testing Adhesives for Paints and varnishes.

ISO 15715-2003 – Determination of paint base turbidity for paints and varnishes

1 range
Liquid turbidity measurements can be made visually or instrumentally, but visual methods can be subjective. The method is used to measure the light scattering of insoluble matter in liquid, so the turbidity can be determined objectively.

Turbidity in a liquid is caused by the presence of undissolved material (i.e. non-settling flocculation, gel, or other suspended matter such as particles or droplets). In the case of finely dispersed undissolved matter, turbidity can be determined by measuring the intensity of light scattered by particles as the beam passes through the liquid.

This standard specifies an instrumental method for determining turbidity of clear liquids. It is applicable to resins and resin solutions, solvents, clear coating materials, monomers and any other liquids of specified clarity.

2 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.

2.1 Turbidity

Reduced liquid clarity due to the presence of an undissolved substance

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