1、BRITISH STANDARD BS3900-F15: 1995 ISO11503: 1995 Methods of test for Paints Part F15: Determination of resistance to humidity (intermittent condensation) ICS 87.040BS3900-F15:1995 This British Standard, having been prepared under the directionof the Sector Board for Materials and Chemicals, was publ
2、ished under the authority of the Standards Board and comes into effect on 15 December1995 BSI 04-1999 The following BSI references relate to the work on this standard: Committee reference STI/10 Draft for comment 94/501538 DC ISBN 0 580 24986 7 Committees responsible for this British Standard The pr
3、eparation of this British Standard was entrusted to Technical Committee STI/10, Test methods for paints, upon which the following bodies were represented: British Coatings Federation Ltd. European Resin Manufacturers Association Furniture Industry Research Association Health and Safety Executive Min
4、istry of Defence National Centre of Tribology Oil and Colour Chemists Association Paint Research Association Titanium Pigment Manufacturers Technical Committee Amendments issued since publication Amd. No. Date CommentsBS3900-F15:1995 BSI 04-1999 i Contents Page Committees responsible Inside front co
5、ver National foreword ii Introduction 1 1 Scope 1 2 Normative references 1 3 Principle 1 4 Required supplementary information 1 5 Apparatus 1 6 Sampling 2 7 Test panels 2 8 Procedure 3 9 Precision 3 10 Test report 4 Annex A (normative) Required supplementary information 6 Figure 1 Airtight cabinet w
6、ith door 4 Figure 2 Airtight cabinet with hood 5 List of references Inside back coverBS3900-F15:1995 ii BSI 04-1999 National foreword This Part of BS3900 has been prepared by Technical Committee STI/10. It is identical with ISO11503:1995, Paints and varnishes Determination of resistance to humidity
7、(intermittent condensation) published by the International Organization for Standardization (ISO). The Technical Committee has reviewed the provisions of ISO1514:1993 to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. ISO1514:1
8、984 is technically equivalent to BSEN605:1992, Paints and varnishes Standard panels for testing. It is planned that ISO1514:1993 will be adopted as a European Standard as a revision of EN605:1992. The Technical Committee have also reviewed the provisions of ISO8335:1987 to which normative reference
9、is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A related British Standard to ISO8335 is BS5669 Particle board Part4:1989 Specification for cement bonded particleboard. A British Standard does not purport to include all the necessary provision
10、s of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International standard Corresponding British Standard ISO1512:1991 BSEN21512:1994 Methods of test
11、for paints Sampling (Identical) ISO1513:1992 BSENISO1513:1995 Paints and varnishes Examination and preparation of samples for testing (Identical) BS3900 Methods of test for paints ISO2808:1991 PartC5:1992 Determination of film thickness (Identical) ISO4628-2:1982 PartH2:1983 Designation of degree of
12、 blistering (Identical) ISO3270:1984 BS3483-0:1990, Appendix A Methods for testing pigments for paints General introduction Atmospheres and temperatures for conditioning and testing (Identical) ISO3696:1987 BS3978:1987 Specification for water for laboratory use (Identical) Summary of pages This docu
13、ment comprises a front cover, an inside front cover, pagesi andii, pages1to6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.ISO11503:1995(E) B
14、SI 04-1999 1 Introduction There is seldom a direct relationship between the resistance of organic coatings to the action of humidity and the resistance to deterioration in other environments. This is because the effect of each of the several factors influencing the progress of deterioration varies g
15、reatly with the conditions encountered. Therefore, the results obtained in this test should not be regarded as a direct guide to the resistance of the tested coatings in all environments where these coatings may be used. Also, performance of different coatings in the test should not be taken as a di
16、rect guide to the relative performance of these coatings in service. Nevertheless, the method described gives a means of checking that the quality of a paint or paint system is being maintained. 1 Scope This International Standard is one of a series of standards dealing with the sampling and testing
17、 of paints, varnishes and related products. It specifies a test method for determining under standard conditions the resistance of a single coat or a multi-coat system of paint or related material to intermittent water condensation. The method includes the testing of coatings on non-porous and on po
18、rous substrates. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreeme
19、nts based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO1512:1991, Paints and varnishes Sampling of products
20、in liquid or paste form. ISO1513:1992, Paints and varnishes Examination and preparation of samples for testing. ISO1514:1993, Paints and varnishes Standard panels for testing. ISO2808:1991, Paints and varnishes Determination of film thickness. ISO3270:1984, Paints and varnishes and their raw materia
21、ls Temperatures and humidities for conditioning and testing. ISO3696:1987, Water for analytical laboratory use Specification and test methods. ISO4628-2:1982, Paints and varnishes Evaluation of degradation of paint coatings Designation of intensity, quantity and size of common types of defect Part2:
22、 Designation of degree of blistering. ISO8335:1987, Cement-bonded particleboards Boards of Portland or equivalent cement reinforced with fibrous wood particles. 3 Principle Coated specimens are placed in a cabinet or chamber containing a heated, saturated mixture of air and water vapour. The tempera
23、ture of the cabinet or chamber is maintained at (40 3) C. At98% to100% relative humidity, the very small temperature difference between the specimen and the surrounding vapour causes the formation of condensation on the specimens. This is an intermittent condensation test and after a period of time
24、under these conditions the conditions in the cabinet or chamber are cycled to give (23 5) C and (50 20) % relative humidity, i.e.dry conditions. Water permeates the coating at rates that are dependent upon the characteristics of the coating. Any effects such as colour change, blistering, loss of adh
25、esion, softening or embrittlement are observed and reported using criteria previously agreed between the interested parties, these criteria usually being of a subjective nature. 4 Required supplementary information For any particular application, the test method specified in this International Stand
26、ard needs to be completed by supplementary information. The items of supplementary information are given in Annex A. 5 Apparatus An airtight laboratory cabinet of capacity300 litres as specified in5.1 or a larger chamber of capacity1m 3or2m 3up to a walk-in chamber as specified in5.2 shall be used.
27、5.1 Airtight cabinet, of capacity (300 10) litres, in the base of which is a watertight trough fitted with a means of heating the water to meet the requirements of8.4. The dimensions and design of the cabinet are not critical, provided the requirements of5.3 are met. It shall be constructed of an in
28、ert material and have a roof which prevents condensed moisture dripping on to the test specimens. The cabinet shall be provided with a means of relieving excess pressure.ISO11503:1995(E) 2 BSI 04-1999 The cabinet shall also be provided with a means of controlling the temperature, which shall be meas
29、ured in the space above the test specimens. NOTE 1Alternative designs of apparatus may be fitted with a door or a removable hood. Suitable designs of apparatus are shown in Figure 1 and Figure 2. 5.2 Airtight chamber, constructed of an inert material, with a window formed by two sheets of glass or o
30、ther transparent material at a distance of10mm or more and with a roof which prevents condensed moisture dripping on to the test specimens. The chamber shall be provided with a means of relieving excess pressure. Insulation of the enclosure is not required. In the base of the chamber is a watertight
31、 trough filled with heated water to a depth of at least10min. The lateral dimensions of the trough shall correspond to the area used to expose the test specimens. The chamber shall be provided with a door or a removable hood. If a walk-in chamber is used, it shall be provided with a ventilator and a
32、n air outlet capable of generating about10 air changes per hour. The chamber is used with the equipment described in5.2.1 to5.2.3. 5.2.1 Heated water tank, outside the test chamber, connected to the trough, a pump, a supply of water of grade2 quality as defined in ISO3696, and a water-level control.
33、 The pump shall be capable of changing the water in the trough about four times per hour to meet the requirements of8.4. 5.2.2 Thermostatic-control unit for the heater in the water tank, with the sensor located in the middle of the chamber at the uppermost specimen-exposure level. 5.2.3 Thermometer,
34、 with its sensor located adjacent to the thermostatic control sensor(5.2.2). NOTE 2If a walk-in chamber is used, it is preferable to install more than one thermometer and have the reading permanently recorded. 5.3 Specimen-suspension/support equipment. Test panels shall normally be suspended, using
35、synthetic-fibre or other inert insulating material. If, however, the test panels are exposed in racks, the racks shall be made of inert material and shall on no account impede the free convection of the air/water-vapour mixture. By agreement between the interested parties, painted specimens of diffe
36、rent shapes may be exposed. These specimens shall be exposed in their normal attitude in use. Test panels shall be exposed vertically at least100mm from any wall or cover, at least20mm from each other and with the lower edges of the panels at least200mm above the water. Panels should preferably be p
37、laced at one level within the cabinet or chamber. In any case, care shall be taken to ensure that water which condenses on the upper panels does not drip on to the lower panels. Coated specimens, including panels, with dimensions larger than those specified in7.1.1 shall be exposed so that their low
38、er edges are above the lowest level that gives condensation. NOTE 3It may be necessary to place the specimens in the upper part of the cabinet as the temperature differences at the lower levels may be too small to induce condensation. 5.4 Environmental cabinet (optional, see8.4), capable of being ma
39、intained at a temperature of(23 5) C and a relative humidity of (50 20) %, and including a stand for test panels 6 Sampling Take a representative sample of the product to be tested (or of each product in the case of a multi-coat system), as described in ISO1512. Examine and prepare each sample for t
40、esting, as described in ISO1513. 7 Test panels 7.1 Substrate The substrate can be a non-porous or porous material equivalent to that on which the coating material under test is designed to be used in practice (see Annex A). 7.1.1 Non-porous substrates Unless otherwise specified or agreed, select as
41、the substrate one of the test panels described in ISO1514 of approximate dimensions150mm 100mm. 7.1.2 Porous substrates Unless otherwise specified or agreed, the panels shall be flat fibre-cement sheets complying with the requirements for type A of ISO8335 and of approximate dimensions300mm 200mm 4m
42、m.ISO11503:1995(E) BSI 04-1999 3 7.2 Preparation and coating of panels Unless otherwise specified or agreed, prepare the test panels in accordance with ISO1514 and then coat them with the product or system under test by the specified method (see Annex A). The back and the edges of the panels shall a
43、lso be coated with the product or system under test, unless otherwise specified or agreed (see Annex A). 7.3 Drying and conditioning Dry (or stove) and age (if applicable) each coated panel for the specified time and under the specified conditions. Unless otherwise specified, condition them at (23 2
44、) C and a relative humidity of(50 5) % for a minimum of16h, with free circulation of air and without exposing them to direct sunlight. The test procedure shall then be carried out as soon as possible. 7.4 Thickness of coating Determine the thickness, in micrometres, of the dry coating, by one of the
45、 non-destructive procedures specified in ISO2808. 8 Procedure Carry out the determination in duplicate unless otherwise agreed. 8.1 Ambient conditions Set up the apparatus (see clause5) in a room with a clean atmosphere and a temperature of (23 5) C and relative humidity of (50 20) %. The apparatus
46、shall be protected from draughts and direct sunlight. 8.2 Filling the trough Fill the trough (see5.1 or5.2) and the heated water tank(5.2.1) with water to a depth of at least10mm. The depth shall be maintained at at least10mm at all times during the test. Use water of grade2 purity as defined in ISO
47、3696. The water should preferably be renewed prior to each heating operation but shall be renewed if it contains visible contaminants. 8.3 Arrangement of test specimens Arrange the test specimens in the cabinet or chamber in accordance with5.3 and close the apparatus. 8.4 Test cycle The test cycle s
48、hall be 16h at a temperature of (40 3) C and a relative humidity of 100% (condensation period); 8h at a temperature of (23 5) C and a relative humidity of (50 20) % (dry period). Switch on the heating appliance and raise the air temperature to (40 3) C in not more than1,5h. Maintain this temperature
49、 for a total period of16h from the commencement of the test cycle. At the end of this period, carry out an interim examination of the test specimens, then: a) switch off the heating appliance and either open the door completely or raise the hood of the apparatus to at least the upper edge of the test specimens or b) if a walk-in chamber(5.2) is used, switch off the heating appliance and use the ventilator to obtain ambient conditions or c) transfer the specimens to an environmental cabinet(5.4). After8h, repla
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