ISO 4591 Plastic films and sheets by gravimetric techniques (gravimetric thickness) Determination of the average thickness of the sample and the average thickness and yield of the roll

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.

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 4591 was developed by the Technical Committee ISO/TC 61, Plastics, Subcommittee SC 11, Products.

The second edition cancelled and replaced the technically revised first edition (ISO 4591:1979).

ISO 4591 Plastic films and sheets by gravimetric techniques (gravimetric thickness) Determination of the average thickness of the sample and the average thickness and yield of the roll

1 range
This standard provides

— A method for determining the weight and thickness of a plastic film or sheet sample (see article 3);

A method for determining the average weight thickness of a plastic film or sheet roll and, if required, the yield per unit mass area (see article 4).

These methods are applicable to all plastic films and sheets and are of particular value when mechanical scanning is not accurate enough, especially for measuring the thickness of embossed sheets.

2 Normative references
The following standards contain provisions which, by reference, constitute the provisions of this International Standard. At the time of publication, the version shown is valid. All standards are subject to revision and parties to an agreement based on this international standard are encouraged to investigate the possibility of applying new versions of the following standards. IEC and ISO members maintain a register of international standards currently in force.

ISO 1183:1987, Plastics. Method for determining the density and relative density of non-honeycomb plastics.

ISO 4592-1992, Plastics. Films and sheets – determination of length and width.

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