1、 Reference number ISO 16053:2010(E) ISO 2010INTERNATIONAL STANDARD ISO 16053 Second edition 2010-02-15 Paints and varnishes Coating materials and coating systems for exterior wood Natural weathering test Peintures et vernis Produits de peinture et systmes de peinture pour bois en extrieur Essai de v
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6、g from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case 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 2010 All rights reservedISO 16053:20
7、10(E) ISO 2010 All rights reserved iiiContents Page Foreword iv 1 Scope1 2 Normative references1 3 Principle2 4 Apparatus and materials.2 5 Sampling.2 6 Test panels.3 7 Procedure.5 8 Precision.7 9 Expression of results and test report7 Annex A (normative) Internal comparison product (ICP) alkyd stai
8、n8 Annex B (normative) Details of test methods 10 Annex C (normative) Assessment requirements for panels of test coatings and ICP13 Annex D (informative) Suggested format for a test report .14 Annex E (informative) Optional tests including variations to the standard weathering test procedure to obta
9、in additional information on coating performance .17 Annex F (informative) Explanatory notes .20 Bibliography21 ISO 16053:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies
10、). 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 no
11、n-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, Par
12、t 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
13、 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 16053 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee
14、SC 9, General test methods for paints and varnishes. It is technically equivalent to EN 927-3. This second edition cancels and replaces the first edition (ISO 16053:2004), which has been technically revised. The main changes are as follows: a) the dimensions of the test panel and the requirements fo
15、r the wood used for the test panels have been changed; b) the requirements concerning the inclination of the growth rings relative to the exposed surface of the test panel have been changed; c) the measurement of the film thickness has been described more precisely; d) the assessment of the exposed
16、test panels now also includes an assessment of their general appearance; e) the photographic rating scale for mould growth (Annex C in the previous edition) has been deleted and mould growth is now assessed in accordance with ISO 4628-1. INTERNATIONAL STANDARD ISO 16053:2010(E) ISO 2010 All rights r
17、eserved 1Paints and varnishes Coating materials and coating systems for exterior wood Natural weathering test 1 Scope This International Standard specifies a natural weathering test for exterior wood coating systems mainly intended for decoration and protection of planed and sawn wood. The test prov
18、ides a means of evaluating the performance of a wood coating system during outdoor exposure. It forms the basis for the performance specification given in EN 927-2. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references,
19、 only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1513, Paints and varnishes Examination and preparation of test samples ISO 2409, Paints and varnishes Cross-cut test ISO 2431, Paints and varnishes Determina
20、tion of flow time by use of flow cups ISO 2808:2007, Paints and varnishes Determination of film thickness ISO 2810, Paints and varnishes Natural weathering of coatings Exposure and assessment ISO 2813, Paints and varnishes Determination of specular gloss of non-metallic paint films at 20, 60 and 85
21、ISO 4628-1:2003, Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 1: General introduction and designation system ISO 4628-2, Paints and varnishes Evaluation of degradation of coatings Design
22、ation of quantity and size of defects, and of intensity of uniform changes in appearance Part 2: Assessment of degree of blistering ISO 4628-4, Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Pa
23、rt 4: Assessment of degree of cracking ISO 4628-5, Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 5: Assessment of degree of flaking ISO 4628-6, Paints and varnishes Evaluation of degradat
24、ion of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance Part 6: Assessment of degree of chalking by tape method ISO 7724-1, Paints and varnishes Colorimetry Part 1: Principles ISO 16053:2010(E) 2 ISO 2010 All rights reservedISO 7724-2, Paints an
25、d varnishes Colorimetry Part 2: Colour measurement ISO 7724-3, Paints and varnishes Colorimetry Part 3: Calculation of colour differences ISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling 3 Principle The resistance to natural weathering of the coating system under test
26、, applied to a wood substrate, is assessed. Durability is evaluated by determining the changes in decorative and protective properties of coatings after 12 months of exposure. The standard test substrate has been selected to be Pinus silvestris (European redwood or Scots pine, subsequently referred
27、to as pine) in order to obtain relevant results more rapidly. Moreover, the sapwood, which is usually present in joinery timber, is used instead of heartwood because paint failure is more evident on the former. Differences in quality of wood, and in the weather and site conditions, are recognized an
28、d allowed for in the method by comparing the test with a reference system. The composition of the reference system (designated the “internal comparison product” or “ICP”) is specified in Annex A. The standard test substrate is pine sapwood with the rear side of the panel untreated. However, suppleme
29、ntary information on coating performance may be obtained by conducting optional tests on additional wood species, on pine modified or impregnated by industrial processes, by using a pine panel containing a water trap in its exposed face, or by coating the rear side of the panel. Optional tests are d
30、escribed in Annex E. It is emphasized that they can serve only to provide additional information. 4 Apparatus and materials 4.1 Exposure racks, inclined at an angle of 45 to the horizontal, on which the specimens are facing towards the equator, in accordance with ISO 2810. 4.2 Glossmeter, for the me
31、asurement of specular gloss in accordance with ISO 2813, at 60 geometry. 4.3 Tristimulus colorimeter or spectrophotometer, for the measurement of colour and calculation of colour difference in CIELAB colour coordinates in accordance with ISO 7724-1, ISO 7724-2 and ISO 7724-3. 4.4 Tape and cutting to
32、ol, for the assessment of adhesion in accordance with ISO 2409. 4.5 Microscope, with a magnification of 10, for the assessment of surface defects. 4.6 Microscope, for the measurement of film thickness in accordance with ISO 2808:2007, method 6A. 4.7 Self-adhesive, transparent tape, in accordance wit
33、h ISO 4628-6, for the assessment of chalking. 4.8 Climate chamber. 5 Sampling Take a representative sample of the product tested, or of each product in the case of a multi-coat system, as described in ISO 15528. Examine and prepare each sample for testing, as described in ISO 1513. ISO 16053:2010(E)
34、 ISO 2010 All rights reserved 36 Test panels 6.1 Wood The wood shall be pine that has been selected to be free from knots, cracks and resinous streaks, to be straight-grained and of normal growth rate (i.e. 3 to 8 annual rings per 10 mm). The inclination of the growth rings to the face shall be 5 to
35、 45 (see Figure 1). The wood shall be free from blue stain and evidence of surface or bulk fungal infection. Abnormal porosity (caused by bacterial attack) shall be avoided (see Clause B.10). The wood shall be conditioned at (20 2) C and a relative humidity of (65 5) % to an equilibrium moisture con
36、tent of (13 2) %. The top of the panel is the exposed side, the bottom is the rear side. a) Example of a panel with heartwood which is not closer than 10 mm to the test surface (as required by 6.2) and fulfilling the requirement for growth ring orientation (5 to 45) on the exposed side. b) This pane
37、l does not meet the specification because the heartwood is too close to the exposed side. c) This panel does not meet the specification because the growth ring orientation is not within the range 5 to 45. The growth rings are inclined at 10 at the left-hand side of the exposed surface and at 30 at t
38、he right-hand side. Consequently, part of the surface contains wood cut at a tangent to the growth rings (growth ring inclination 0), with considerable risk of crack formation. d) This panel does not meet the specification because the growth ring orientation is not within the range 5 to 45. The grow
39、th rings are inclined at 45 at the left-hand side of the exposed surface but at 70 at the right-hand side. Figure 1 Examples of acceptable and unacceptable panels (shown in cross-section) 6.2 Preparation and selection of wood panels The panels shall be cut from boards planed all round and shall be n
40、ominally (375 2) mm (78 3) mm and (20 2) mm thick. For details of panel preparation, see Figure 2. The panels shall be planed to a smooth and uniform finish. In order to avoid having an aged wood surface, the panels shall be hand-sanded (using 150-mesh sandpaper) immediately before coating. Rounding
41、 of edges is not permitted. ISO 16053:2010(E) 4 ISO 2010 All rights reservedThe panels shall be selected to give a sapwood test surface on the convex side of the growth rings, with any heartwood confined to a zone no closer than 10 mm from the front side. Heartwood shall be checked with the reagent
42、described in Clause B.11, at both ends of each panel. Any panels showing surface splitting shall be rejected. Where the presence of some minor defects in the test area is unavoidable, their position shall be noted and their influence excluded during assessment of coating performance. Dimensions in m
43、illimetres Key 1, 2 and 3 exposure panels R unexposed reference panel aSealed end (may be used for numbering of test panels). bSection for application of coating system. cSealed end. NOTE The figure is not to scale. Figure 2 Details of test panels 6.3 Preparation of coated panels 6.3.1 Wood conditio
44、ning Prior to coating, condition the panels at (20 2) C and a relative humidity of (65 5) % until constant mass is reached. Keep the panels under the same conditions during drying of the coating system and during subsequent storage of the panels before exposure. Panels may be transferred for brief p
45、eriods to other ambient conditions where this is required for the conduct of specific operations or assessments. ISO 16053:2010(E) ISO 2010 All rights reserved 56.3.2 Preparation of panels for the test coating For each system, select four panels on a random basis from the available supply. Three pan
46、els shall be used for exposure and the fourth shall be an unexposed reference panel. Apply the coating system to the front and side faces of each panel. The front side of the panel is the side which was facing the bark of the tree. The rear of the panel and the end-grains shall be left uncoated. App
47、ly the coating system using the method specified by the manufacturer to give a wet film thickness corresponding to the mean value ( 20 %) of the manufacturers recommended spreading rate. Record the quantity of coating applied to each test panel and subsequently calculate a mean value for the four pa
48、nels. The values should preferably be stated in g/m 2 , but may also be expressed as wet film thickness (in micrometres). 6.3.3 Preparation of panels for the internal comparison product (ICP) Prepare four panels by applying the ICP (see Annex A) to the front and side faces of each panel. The rear of
49、 the panel and the end-grains shall be left uncoated. Apply the ICP by brushing in three coats, allowing a drying period of 16 h to 24 h between coats. The spreading rate shall correspond to a total of (150 30) g/m 2of wet film. The dry film thickness shall be (50 10) m on pine. One set of ICP panels, exposed at the same time as the test coatings, may serve as the comparison for one or more test coatings. 6.3.4 Sealing and ageing Wh
