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.

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ISO 9117-5 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:

ISO 9117-5-2012 Drying tests for paints and varnishes – Part 5: Improved Bandow.Wolff 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

introduce
With regard to the drying stages 2 to 7 defined in this part of ISO 9117 (see Table 1), it should be noted that the drying of different coatings applied to the same substrate is not uniform. In the case of physical drying or oxidation/reaction-controlled drying, the processes that occur during film formation are so different that grades cannot be clearly distinguished. Therefore, when testing with this part of ISO 9117, it is possible to reach a higher drying stage before a lower drying stage within the range covered by drying stages 4 to 7. Therefore, a difference in one drying stage within this range does not necessarily mean a specific difference in drying rate. Elastoplastic coatings may never reach the drying stage 5 to 7. If the surface is sticky, although the surface looks completely dry, it may not reach the high drying stage. In general, the visible changes involved in drying stages 4 and 6 (see Table 1) can be evaluated more accurately on glossy surfaces than on matte or structured surfaces.

ISO 9117-5-2012 Drying tests for paints and varnishes – Part 5: Improved Bandow.Wolff tests

Therefore, the tests described in this part of ISO 9117 should be considered as a technical tool with relatively limited utility. However, this test (if used in conjunction with other test procedures) should ensure that the parties concerned can agree on the measurement of a performance characteristic called “drying rate”.

1 Range
This part of ISO 9117 specifies a method for determining whether coatings, including those produced using multi-layer coating systems, have reached different drying stages (see Table 1). In addition, it allows the drying rate to be assessed.

For plastic coatings, it can only be determined to a limited extent whether drying stages 4 to 7 have been reached, as the elastoplastic behavior of these coatings cannot be assessed on the basis of temporary visible changes in the coating surface.

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 9117-3, Paints and varnishes – Drying tests – Surface drying tests using Balotini

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

ISO 9117-5-2012 Drying tests for paints and varnishes – Part 5: Improved Bandow.Wolff tests

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