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 2 of the ISO/IEC Directive.

The main task of the technical committee is to develop international standards. 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.

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ISO 9117-4-2012 Drying tests for paints and varnishes – Part 4: Testing with mechanical recorders

ISO 9117-4 was developed by Technical Committee ISO/TC 35, Paints and Varnishes, Sub-Committee SC 9, Common Test Methods for paints and varnishes.

ISO 9117 consists of the following parts, under the general heading Paints and varnishes – Drying Tests:

– Part 1: Determination of drying state and drying time

– Part 2: Stress testing for stackability

– Part 3: Surface drying test using Balotini

– Part 4: Testing using a mechanical recorder

– Part 5: Modified Bando-Wolff test

– Part 6: Print-free testing

ISO 9117-4-2012 Drying tests for paints and varnishes – Part 4: Testing with mechanical recorders

introduce
The drying time of the coating is important in determining when a newly painted room, floor or staircase can be re-used or when newly painted items can be handled or packaged. Slow drying may lead to dirt contamination, or on the outside surface, moisture may cause an uneven appearance.

The tests described in this part of ISO 9117 are used to determine, using a mechanical recorder, the various stages of drying or curing during the formation of an organic coating dry film in order to compare coating type or composition changes, or both. For quantitative assessment of the drying phase, the use of a recorder under controlled environmental conditions is strongly recommended. The use of mechanical recorders also provides a way to determine the drying characteristics of coatings that cannot be determined during a standard 8-hour working day.

This test can be used to compare the behavior of the same generic type coating during the drying process. The actual drying time shall be determined in accordance with the procedures specified in ISO9117-1 or ISO 9117-3.

1 Range
This part of ISO 9117 specifies tests using a mechanical linear or circular drying time recorder to determine the time required to reach the various stages of drying of an organic coating. Using a mechanical recorder is valuable for comparing the drying behavior of coatings of the same generic type, when one coating may form a gel at a faster rate than another or may resist scratching better than another. The test is designed to simulate the conditions that exist when painted items are stacked on top of each other.

ISO 9117-4-2012 Drying tests for paints and varnishes – Part 4: Testing with mechanical recorders

2 Normative references
The following reference files are required for the application of this document. For dated references, only the cited version applies. For undated references, a new version of the reference (including any revisions) applies.

ISO 1513, Paints and varnishes – Examination and preparation of test samples

ISO 1514, Paints and varnishes – Standard panels for testing

ISO 2808, Paints and varnishes – Determination of film thickness

ISO 3270, Paints and varnishes and their raw materials – regulation and testing of temperature and humidity

ISO 15528, Paints, varnishes and raw materials for paints and varnishes – Sampling

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