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 3 of the ISO/IEC Directive.

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.

International standard ISO 14446 was developed by Technical Committee ISO/TC 35, Paints and Varnishes, Subcommittee SC 10, Test Methods for Paints and varnishes Adhesives.

Annex A forms the normative part of this international standard.

1 range
This standard specifies the method for determining the viscosity of industrial nitrate cellulose (commonly known as nitrocellulose), whose nitrogen content can vary between 10.7% (mass) and 12.6% (mass), depending on the type.

It also gives A classification system for industrial cellulose nitrate solutions (see annex A) based on viscosity measurements made using this method. Using standard procedures results in “standard” types and avoids classification differences, which may be caused by the many ways of determining viscosity and the wide variety of solvents available.

ISO 14446-1999 “Paints and varnishes binders industrial viscosity determination and classification of cellulose nitrate solutions”

2 Normative references
The following normative documents contain provisions which, by reference herein, constitute the provisions of this International standard. For dated references, no subsequent revisions or amendments to these publications will apply. However, Parties to agreements based on this International Standard are encouraged to investigate the possibility of applying new versions of the following normative documents. For undated references, a new version of the normative document referred to applies. Members of ISO and IEC maintain a register of international standards currently in force.

ISO 760:1978, Determination of water – Karl Fischer method (general method).

ISO 2811-1:1997, Paints and varnishes. Determination of density – Part 1: specific gravity bottle method.

ISO 2811-2:1997, Paints and varnishes. Determination of density – Part 2: immersion (plunge) method.

ISO 2811-3-1997, Paints and varnishes. Determination of density – Part 3: Oscillation method.

ISO 12058-1:1997, Plastics. Use a falling ball viscometer to measure viscosity. Part 1: Inclined tube method.

ISO 15528:– 1), paints and varnishes — Sampling.

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