ISO 9117-5:2012 塗料とワニス—乾燥テスト—パート5：修正されたBandow-Wolffテスト | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 9117-5 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes.

ISO 9117 consists of the following parts, under the general title Paints and varnishes — Drying tests:

• Part 1: Determination of through-dry state and through-dry time
• Part 2: Pressure test for stackability
• Part 3: Surface-drying test using ballotini
• Part 4: Test using a mechanical recorder
• Part 5: Modified Bandow-Wolff test
• Part 6: Print-free test

Introduction

With regard to drying stages 2 to 7 (see Table 1) defined in this part of ISO 9117, it should be noted that the drying of different coats applied to the same substrate does not proceed uniformly. The processes which take place during film formation in the case of physical drying or oxidative/reaction-controlled drying are so different that a clear distinction between grades is not possible. Therefore, when testing using this part of ISO 9117, it is possible that, within the range covered by drying stages 4 to 7, a higher drying stage might be reached before a lower drying stage. For this reason, a difference of one drying stage within this range does not necessarily mean a specific difference in drying speed. Elasto-plastic coatings might never reach drying stages 5 to 7. If the surface is tacky, it is also possible that the high drying stages will not be reached, although the surface appears completely dry. Generally, the visible changes involved in drying stages 4 and 6 (see Table 1) can be evaluated more exactly on glossy surfaces than on matt or structured surfaces.

The test described in this part of ISO 9117 should therefore be seen as a technological tool with relatively limited usefulness. The test (if used in connection with other test procedures) should, however, ensure that the interested parties can agree on a measure for the performance characteristic referred to as “drying speed”.

1 Scope

This part of ISO 9117 specifies a method for determining whether coatings, including those produced using multi-coat systems, have reached various stages of drying (see Table 1). Furthermore, it allows the drying speed to be assessed.

In the case of plastic coatings, it is only possible to determine to a limited extent whether drying stages 4 to 7 have been reached, as the elasto-plastic behaviour of these coatings cannot be evaluated on the basis of a temporary visible change in the coating surface.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

Bibliography