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1、BRITISH STANDARD BS 5082:1993 Specification for Water-borne priming paints for woodwork UDC 667.638.2:667.636.42:674.07 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5082:1993 This British Standard, having been prepared under the direct
2、ion of the Pigments, Paints and Varnishes Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 January 1993 BSI 08-1999 First published July 1974 Second edition September 1986 Third edition January 1993 The following BSI references relate t
3、o the work on this standard: Committee reference PVC/28 Draft for comment 92/54596 DC ISBN 0 580 21458 3 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Pigments, Paints and Varnishes Standards Policy Committee (PVC/-) to Technical Commi
4、ttee PVC/28, upon which the following bodies were represented: British Cement Association British Decorators Association British Railways Board Consumer Policy Committee of BSI Department of Education and Science Department of the Environment (Building Research Establishment) Department of the Envir
5、onment (Property Services Agency) European Resin Manufacturers Association Furniture Industry Research Association Ministry of Defence Oil and Colour Chemists Association Paint Research Association Paintmakers Association of Great Britain Ltd. Society of Chemical Industry Titanium Pigment Manufactur
6、ers Technical Committee Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5082:1993 BSI 08-1999i Contents Page Committees responsibleInside front cover Foreword ii 1Scope1 2Definition
7、s1 3Classification1 4Sample1 5Composition1 6Flashpoint1 7Condition in container and consistency1 8Application properties2 9Drying and recoating times2 10Film properties and finish2 11Resistance to natural weathering2 12Blocking2 13Recoatability after natural weathering2 14Compatibility with glazing
8、putty3 15Low temperature film formation3 16Blister resistance3 17Marking of containers3 Appendix A Test for resistance to natural weathering4 Appendix B Blocking test6 Appendix C Test for recoatability after natural weathering7 Appendix D Test for compatibility with glazing putty7 Appendix E Test fo
9、r low temperature film formation8 Appendix F Blister resistance test9 Figure 1 Test for blocking7 Figure 2 Putty compatibility test8 Figure 3 Details of a suitable blister box for blister resistance test10 Table 1 Preservative solution4 Table 2 Reference primer5 Publication(s) referred toInside back
10、 cover Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5082:1993 ii BSI 08-1999 Foreword This British Standard has been prepared under the direction of the Pigments, Paints and Varnishes Standards Policy Committee. It supersedes BS 5082:1
11、986 which is withdrawn. This edition introduces technical changes to bring the standard up to date but it does not reflect a full review of the standard, which will be undertaken in due course. The main technical changes are: a) the updating of references to lead in 5.3; b) the inclusion of addition
12、al information on driers in Table 2. The first edition of BS 5082 was prepared as the result of a generally expressed need to use low-lead materials in paints and primers. That edition specified a single type of product which was considered suitable for application to soft woods exposed to both exte
13、rior and interior use. That standard was revised in 1986 principally to institute a test for resistance to natural weathering, which was more reliable and relevant to current practice, and also to align it in this and other respects with the concurrent revision of BS 5358. Concern over the presence
14、of toxic materials in the environment has increased the desirability of avoiding paints and primers that contain significant quantities of lead, particularly where children could chew paintwork or detached paint flakes. Therefore British Standards for lead-based wood primers have already been withdr
15、awn. For external painting, it is important to use an alternative type of primer with as good a performance as possible since the use of unsatisfactory low-lead primers has caused much premature failure of exterior paintwork. This standard is intended to specify wood primers that are suitable for bo
16、th interior and exterior use and which will give a performance on exterior woodwork comparable to that of the former British Standard lead-based primers. Even though it is bad practice and cannot be condoned, primed joinery is liable to be left on a building site for several months, exposed to the w
17、eather without the protection of a finishing paint system. The weathering characteristics of the primer, and its permeability to water and water vapour, are therefore of importance. Artificial weathering tests have been found to be unsatisfactory for assessing the durability of these primers. This s
18、pecification, therefore, relies on a period of natural weathering to evaluate durability by direct comparison with a reference primer. Joinery to be painted is generally treated with some form of preservative which not only reduces the risk of decay but, if it contains a resin, may improve the perfo
19、rmance of the primer. When applied correctly to normal wood and allowed sufficient time to dry, preservatives do not generally have adverse effects on the adhesion and other properties of primers, but it is desirable to confirm with the primer manufacturer that any particular combination of primer a
20、nd preservative is compatible. The weathering test described in this standard is specified to be carried out on preservative treated wood. It should be noted, however, that even if satisfactory compatibility between primer and preservative has been shown, some of the timber used may be found to be a
21、bnormally permeable causing an excessive uptake of preservative which can seriously affect the paint films obtained from water-thinned or any other type of primer. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5082:1993 BSI 08-1999iii W
22、ater-borne primers have the advantages of being quick-drying, non-flammable and non-toxic. Because they are generally more moisture permeable than solvent-borne primers, they allow more rapid uptake and release of moisture in wood. This can lead to greater movements of joints during exposure, and po
23、ssibly to surface splitting, if the joinery is left unprotected for extended periods. Care should be taken that finishing coats are not applied when the moisture content of the wood exceeds 18 %. Water-thinned primers allow drying out of the wood to occur fairly quickly In the 1986 edition of BS 508
24、2, two types of water-borne priming paint were specified; type A being for general use (mainly brush applied) and type B for industrial applications. Because the latter may be supplied in a form requiring thinning before use (e.g. in a spray gun), the volatile content (see 5.2) and the hard-drying t
25、ime (see 9.1) were only specified for the type A product. The low temperature drying characteristics (see clause 15), although specified for both type A and type B, were not required for type B primers intended for force-drying. Other differences between the types of primer were reflected in the req
26、uirements for the initial condition in the container (see 7.1), application properties (see clause 8) and recoating time (see 9.2). The 1986 revision of this standard omitted the requirements for colours and viscosity given in the 1974 edition. The former was considered to be no longer needed, and t
27、he latter would be controlled by the application properties specified in clause 8. The tests for natural weathering and recoatability after natural weathering were carried out at a relative humidity of 65 5 %. In addition, to minimize splitting of the timber for the test panels for the blister resis
28、tance test (Appendix F), test panels for this test should be conditioned and tested at a relative humidity of 65 5 %. Attention is drawn to the need, when carrying out the tests specified in 9.2, clause 13 and Appendix C and Appendix F, to apply either an undercoat or a top coat that is preferably o
29、ne recommended by the manufacturer of the primer. These subsequent paints should be compatible with and suitable for application to the primer after the appropriate drying period. It has been assumed in the drafting of this standard that the execution of its provisions is entrusted to those who are
30、appropriately qualified and experienced. WARNING NOTE. This standard calls for the use of substances and test procedures that may be injurious to health if adequate precautions are not taken. The standard refers only to technical suitability and in no way absolves either the supplier or the user fro
31、m statutory obligations relating to health and safety at any stage of manufacture or use. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not o
32、f itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 10, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will
33、 be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5082:1993
34、BSI 08-19991 1 Scope This British Standard specifies two types of water-borne priming paints for application on softwood for both interior and exterior use (see warning note in foreword). NOTE 1Paints complying with this standard may be suitable for use on some non-resinous hardwoods, but the user i
35、s advised to consult the paint manufacturer in each individual circumstance. NOTE 2The titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standard, the definitions given in BS 2015 and BS 6100-4 apply. 3 Classif
36、ication The priming paints specified in this standard shall be classified as follows. a) Type A. A general purpose primer for application by brush and suitable for use on untreated wood or on wood pretreated with a preservative. NOTEOptimum exterior performance of the primer will be normally obtaine
37、d if applied to wood pretreated with a preservative recommended in BS 5589. b) Type B. An industrial primer for factory application by spraying, dipping or other mechanical process and which for exterior use will normally be applied to wood treated with one of the preservatives recommended in BS 558
38、9. 4 Sample For the purposes of the tests referred to in clauses 5 to 16, a representative sample of the paint, measuring not less than 500 mL, shall be taken and packed by the method described in BS 3900-A1. A container of glass or other non-corrodible material shall be used. 5 Composition 5.1 Gene
39、ral The primer shall be based on a pigmented aqueous solution or a dispersion of polymeric material. Neither the polymer nor the primer based on it shall contain any added plasticizer. 5.2 Volatile content (type A products only) The volatile content of the primer shall not exceed the limiting values
40、 specified in either a) or b) as follows: a) not more than 50 % (m/m), when tested in accordance with BS 3900-B2 at a temperature of 105 2 C; b) not more than 65 % (V/V), when tested in accordance with BS 3900-A10. NOTEEither a) or b) may be specified, Both tests have been given to allow freedom in
41、formulation. It is sufficient to meet either of the alternatives but not necessarily both. 5.3 Lead content The primer, when tested in accordance with BS 3900-B4, shall contain less than 0.5 % (m/m) total lead of the total mass of the primer as supplied. NOTECurrent classification and labelling regu
42、lations require that paints containing more than 0.15 % total lead should be labelled “contains lead should not be used on surfaces liable to be chewed or sucked by children”. 6 Flashpoint The primer, when tested in accordance with BS 3900-A8 or BS 3900-A13, shall have a flashpoint higher than 55 C.
43、 7 Condition in container and consistency 7.1 Initial condition When the primer in its original container is examined by the method described in BS 3900-A2, it shall not show hard settling, excessive separation, skinning, irreversible gelation, mould growth or putrefaction. Type A products shall be
44、ready for use without thinning. Type B products shall be supplied ready for use or in a form requiring thinning in accordance with the manufacturers recommendations. 7.2 Keeping properties The primer, when stored in its original sealed container at between 4 C and 25 C for 12 months from the date of
45、 manufacture, shall comply with the requirements of 7.1, clauses 8, 9 and 10.1. NOTEIf storage conditions are abnormal, tile manufacturer of the primer should be informed so that any special recommendations may be made. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:05:27 GMT+00:00 2006,
46、Uncontrolled Copy, (c) BSI BS 5082:1993 2 BSI 08-1999 8 Application properties 8.1 Type A products When the primer is applied in accordance with BS 3900-A5 to a plywood panel with moulding and examined not less than 2 h after application, using normal or corrected vision, the film shall be free from
47、 sagging, wrinkling or sheariness (see BS 2015). 8.2 Type B products When the primer is applied, by the method specified by the manufacturer, to a panel as described in A.2 and examined not less than 2 h after application, using normal or corrected vision, the film shall be free from sagging, wrinkl
48、ing or sheariness (see BS 2015). 9 Drying and recoating times 9.1 Hard-dry time (type A products only) When the primer is applied using a 100 4m bar or block applicator to a clean glass test panel, complying with BS 3900-A3, at a wet film thickness of 55 5 4m and allowed to dry with free access of a
49、ir at 23 2 C and a relative humidity of 50 5 % and then tested by the method described in BS 3900-C3, the paint film shall be hard-dry in not more than 75 min. NOTEType B products are intended for industrial use where force-drying is common practice. Thus it is not possible to specify a hard-drying time for these products but, if required, it may be the subject of agreement between the purchaser and the supplier. 9.2 Recoating time The primer shall be applied, by the method specified by the manufacturer, to a European redwood (Pinus sylvestris) pa