1、 Reference number ISO 12466-2:2007(E) ISO 2007INTERNATIONAL STANDARD ISO 12466-2 Second edition 2007-11-15 Plywood Bonding quality Part 2: Requirements Contreplaqu Qualit du collage Partie 2: Exigences ISO 12466-2:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance wit
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6、postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2007 All rights reservedISO 12466-2:2007(E) ISO 2007 All rights reserved iii Foreword ISO (the International Organization for Standardization) is a worldw
7、ide 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 th
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10、equires 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 12466-2 was prepared by Te
11、chnical Committee ISO/TC 89, Wood based panels, Subcommittee SC 3, Plywood. This second edition cancels and replaces the first edition (ISO 12466-2:1999) which has been technically revised. ISO 12466 consists of the following parts, under the general title Plywood Bonding quality: Part 1:Test method
12、s Part 2: Requirements INTERNATIONAL STANDARD ISO 12466-2:2007(E) ISO 2007 All rights reserved 1 Plywood Bonding quality Part 2: Requirements 1 Scope This part of ISO 12466 specifies requirements for determination of bonding quality class of plywood, blockboard, battenboard, and laminboard, bonded w
13、ith thermosetting resins, according to their intended end uses. NOTE Appropriate test methods are specified in ISO 12466-1. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For unda
14、ted references, the latest edition of the referenced document (including any amendments) applies. ISO 12465, Plywood Specifications ISO 12466-1:2007, Plywood Bonding quality Part 1: Test methods 3 Bonding classes Bonding quality is categorized into three classes, in accordance with ISO 12465, based
15、upon moisture resistance as follows. 3.1 Class 1: Dry conditions This bonding class is appropriate for veneer plywood intended for use in normal interior climates excluding any extended direct exposure to weather. 3.2 Class 2: Tropical-dry/humid conditions This bonding class is appropriate for venee
16、r plywood intended for protected external applications (e.g behind cladding or under roof coverings), but capable of resisting weather exposure for short periods (e.g. when exposed during construction). It is also suitable for interior situations where the service moisture condition is higher than t
17、he class 1 level. 3.3 Class 3: High humidity/exterior conditions This bonding class is designed for veneer plywood intended for exposure to weather over sustained periods. NOTE The durability of plywood depends not only upon the level of bonding performance, but also upon other factors. ISO 12466-2:
18、2007(E) 2 ISO 2007 All rights reserved4 Requirements 4.1 General For each bonding quality class, both the mean shear strength and the average apparent cohesive wood failure shall be determined in accordance with ISO 12466-1. Test pieces shall be pre-treated as specified for the applicable bonding cl
19、ass, as given in Table 1. A minimum of 10 test pieces per glue line shall satisfy the criteria given in Table 2. For Class 2 and Class 3 where two pre-treatments are required, each pre-treatment shall be carried out on a separate set of not less than five test pieces for each glue line. 4.2 Pre-trea
20、tments Table 1 Pre-treatment requirements Pre-treatment Basic Additional Bonding class 24 h Cold soak (ISO 12466-1: 2007, 5.1.1) VP (ISO 12466-1: 2007, 5.1.4) 6 h Boil (ISO 12466-1: 2007, 5.1.2) BDB (ISO 12466-1: 2007, 5.1.3) 72 h Boil (ISO 12466-1: 2007, 5.1.5) Steam (ISO 12466-1: 2007, 5.1.6) 1 X
21、X 2 X X X X X X 3 X X X X X One of the indicated basic pre-treatments shall be chosen, plus one of the indicated additional pre-treatments for bonding class 2 and bonding class 3. For full phenolic adhesives, when VP is used as the basic pre-treatment, an additional pre-treatment needs to be only oc
22、casionally conducted for validation purposes. 4.3 Glue line requirements For all three bonding classes, each glue line tested shall satisfy two criteria: the mean shear strength and the average apparent cohesive wood failure, as combined in Table 2. Table 2 Glue line requirements Mean shear strength
23、 Average apparent cohesive wood failure MPa % 0,2 0,2 u 0,4 0,4 u 0,6 0,6 u u 1,0 1,0 not applicable W 80 W 60 W 40 no requirement ISO 12466-2:2007(E) ISO 2007 All rights reserved 3 The relationship between the average percentage of apparent cohesive wood failure and the mean shear strength given in
24、 Table 2 is illustrated in Figure 1. If ISO 12466-1:2007, Annex B (chisel/knife testing) is used, the average bond quality of each glue line of test sample shall be a minimum of 2 and the overall average bond quality for all glue lines in the test sample shall be 5. Key 1 accept 2 fail X mean shear
25、strength, , MPa Y average apparent cohesive wood failure, % Figure 1 Relation between average percentage of apparent cohesive wood failure and mean shear strength 5 Determination of bonding quality The comparison of results obtained in accordance with ISO 12466-1 with the requirements defined in thi
26、s part of ISO 12466 allows determination of the bonding class to which the tested panel belongs. ISO 12466-2:2007(E) 4 ISO 2007 All rights reservedBibliography 1 ISO 1096, Plywood Classification 2 ISO 2074, Plywood Vocabulary ISO 12466-2:2007(E) ICS 79.060.10 Price based on 4 pages ISO 2007 All rights reserved
