1、BRITISH STANDARD BS4764:1986 Specification for Powder cement paints UDC 667.621.223:666.942-492.2BS4764:1986 This British Standard, having been prepared under the directionof the Pigments, Paintsand Varnishes StandardsCommittee, was published under the authority ofthe Board of BSI and comes intoeffe
2、ct on 31January1986 BSI10-1999 First published September1971 First revision January1986 The following BSI references relate to the work on this standard: Committee reference PVC/28 Draft for comment83/55096 DC ISBN 0 580 14840 8 Committees responsible for this British Standard The preparation of thi
3、s British Standard was entrusted by the Pigments, Paints and Varnishes Standards Committee (PVC/-) to Technical Committee PVC/28 upon which the following bodies were represented: British Railways Board British Resin Manufacturers Association British Wood Preserving Association Building Employers Con
4、federation Cement Makers Federation Consumers Association Department of the Environment (Building Research Establishment) Electricity Supply Industry in England and Wales Greater London Council London Regional Transport Ministry of Defence National Federation of Painting and Decorating Contractors O
5、il and Colour Chemists Association Paint Research Association Paintmakers Association of Great Britain Ltd. Royal Institute of British Architects Society of Chemical Industry Timber Research and Development Association Titanium Pigment Manufacturers Technical Committee Union of Construction, Allied
6、Trades and Technicians White Lead Manufacturers Association Amendments issued since publication Amd. No. Date of issue CommentsBS4764:1986 BSI 10-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Description 1 4 Composition 1 5 Sample 1 6 Colour 1
7、 7 Film properties 1 8 Keeping qualities 2 9 Identification of containers 2 Appendix A Preparation of coated test panels 3 Appendix B Determination of film properties 3 Appendix C Recommendations for use of powder cement paints 4 Publications referred to Inside back coverBS4764:1986 ii BSI 10-1999 F
8、oreword This revision of BS4764, prepared under the direction of the Pigments, Paints and Varnishes Standards Committee, supersedes BS4764:1971 which is withdrawn. This revision of BS4764 has been prepared in order to accommodate the changes that have occurred since the1971 edition was published. So
9、me pigments that are no longer economic to use or readily available have been replaced by more modern and less fugitive (see BS2015) alternatives. The test for chalking has been made less subjective to facilitate independent quality assessment. The composition requirements have been modified to perm
10、it the addition both of more suitable curing agents and of materials to provide textured finishes. The test for acid-soluble residue on sieve has not been included as it is no longer relevant for products designed to give textured finishes. Considerable thought has been given to the provision of sui
11、table tests to evaluate the durability of cement paints, and the tests described in Appendix B are considered the best that can be put forward to define the requirements for satisfactory products. The Technical Committee is currently investigating alternative cementitious substrates that could be su
12、itable replacements for the asbestos-cement test panels detailed in Appendix A. Until these alternatives have been evaluated, it will be necessary to continue the use of asbestos-cement test panels when assessing the powder cement paint specified in this standard. Meanwhile, attention is drawn to th
13、e hazards associated with the use of asbestos-containing materials (see clause1 and Appendix A). It should also be noted that the procedures described in this standard are intended to be carried out only by suitably trained and/or supervised personnel. The substances and procedures described may be
14、injurious to health if adequate precautions are not taken. This standard refers only to technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage. Products complying with this standard have been found to give satisfactory service in the UK
15、and similar temperate climates. Also, experience has shown that these materials are suitable for use in most other climates, although in hot dry climates extra care should be given to the prevention of premature drying out (seeC.5). General recommendations for the use of cement paints are given in A
16、ppendix C. It should be noted that compliance with this standard is dependent upon the use of photographic reference standards contained in Pictorial standards of coating defects, published by the Federation of Societies for Coatings Technology (see the footnote to clause7). Purchasers ordering to t
17、his standard are advised to specify in their purchasing contract that the supplier operate a quality system in compliance with BS5750-3 to ensure, to their satisfaction, that products claiming to comply with BS4764 consistently achieve the required level of quality. A guide to the use of BS5750-3 is
18、 given in BS5750-6. 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 of itself confer immunity from legal obligations. Summary of pages This
19、 document comprises a front cover, an inside front cover, pagesi andii, pages1 to6, 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 the inside front cover.BS4764:1986
20、 BSI 10-1999 1 1 Scope This British Standard specifies requirements for a Portland cement-based paint powder that, when mixed with water, provides decorative and protective coatings for interior and exterior use on porous surfaces of masonry, concrete, cement renderings, bricks, building blocks and
21、asbestos-cement. Recommendations for the use of powder cement paints are given in Appendix C. This standard is not suitable for products to be applied to gypsum or any other surface with an appreciable water-soluble sulphate content. CAUTION. In order to test products claiming compliance with this s
22、tandard, the use of asbestos-cement test panels is stipulated (seethe foreword). Attention is drawn to the hazards associated with asbestos-containing materials and the precautions that should be taken (seeAppendix A). NOTEThe titles of the publications referred to in this standard are listed on the
23、 inside back cover. 2 Definitions For the purposes of this British Standard, the definitions given in BS2015 apply. 3 Description The product shall be in powder form and shall mix with water to form, on simple stirring, a homogeneous paint showing no unwetted material. The powder shall be free from
24、lumps and, except for powders designed to give a textured finish, the powder shall be capable of passing through a sieve with a nominal aperture size of1.5mm, complying with BS410. NOTEWith products designed to give a textured finish, the added texturing material may exceed the size specified. 4 Com
25、position The product shall consist essentially of Portland cement, complying with BS12, pigments and extenders. The extenders shall be limestone (including chalk and whiting) or silicious matter as specified in BS1795, or shall be hydrated lime. NOTE 1Whenever possible, the pigments should comply wi
26、th BS1014. The pigments most commonly used are iron oxides, chrome oxides, carbon black, titanium dioxide and green and blue phthalocyanine pigments. NOTE 2Experience has shown that a composition based on the following will comply with this standard: In addition, the amount of any water-soluble non-
27、volatile organic matter, used in the composition, should not exceed a maximum of2.5% (m/m), as many commonly used additives can have a deleterious effect on durability. Also, not more than10% (m/m) of additives may be introduced. 5 Sample For the purposes of the tests specified in clauses6, 7 and8,
28、representative samples of the product, weighing not less than1kg, shall be taken and stored as described in BS3900-A1. Each sample shall be packed in dry, airtight, non-absorbent containers on which the product has no action, and shall be labelled as described in BS3900-A1. 6 Colour When a coated te
29、st panel, prepared as described in Appendix A, is tested by the procedure described in BS3900-D1, the colour of the coating shall be uniform and free from streaks, spots or mottling and shall closely match the nominated reference colour. NOTEThe colour range available is limited by the nature of the
30、 product but, as far as possible, the colour specified should be chosen from BS4800. If this is not possible, the colour of a reference sample should be agreed between the supplier and the purchaser. 7 Film properties A coated test panel, when prepared as described in Appendix A and tested by the pr
31、ocedures described in Appendix B, shall show no chalking in excess of the minimum illustrated in the photographic reference standards in Pictorial Standards of Coating Defects 1) . NOTE 1Appearance of lime bloom (i.e.calcium sulphate or carbonate) and efflorescence may occur on cement paint films th
32、at have been applied to cement products. In cases of dispute, the test should be carried out using a substrate complying with either BS402 or BS1286. NOTE 2With products designed to give a textured finish, the texturing material may cause difficulties in interpreting the results of this test. Displa
33、cement of the coarse texturing material in the finish and the attachment of this material to the velvet cloth (seeB.1.2) are not to be considered in relation to this test. Portland cement, complying with BS12 65% (minimum) (m/m) Calcium chloride (CaCl 2 ) 4% (maximum) (m/m) of the dry cement calcula
34、ted as the anhydrous material 1) The pictorial photographic reference standards, contained in Pictorial Standards of Coating Defects, are published by the Federation of Societies for Coatings Technology. Copies of this publication are obtainable from the Federation at1315Walnut Street, Suite830, Phi
35、ladelphia, Pa19107, USA or from Technical Standards Services Limited,17Temple Street, Aylesbury, Bucks HP202RN. (The reference standards are illustrated in ASTM D659-80 but these illustrations are for information and not for use in evaluating the degree of chalking.)BS4764:1986 2 BSI 10-1999 8 Keepi
36、ng qualities The product, when stored in its original sealed container at between4 C and25 C for a period of12months from the end of the month of manufacture see itemd) of clause9, shall comply with clauses3, 6 and7. NOTEIf conditions of storage are abnormal, the manufacturer of the product should b
37、e informed so that any special recommendations can be made. 9 Identification of containers The containers of products shall be clearly and indelibly marked with the following information: a) the name of the supplier or manufacturer; b) trade name, if any; c) colour (or colour code); d) identificatio
38、n or batch number, including month and year of manufacture; e) the number and date of this British Standard, i.e.BS4764:1986 2) ; f) mixing and application instructions; g) statutory requirements and information, as necessary. 2) Marking BS4764:1986 on or in relation to a product is a claim by the m
39、anufacturer that the product has been manufactured to the requirements of the standard. The accuracy of such a claim is therefore solely the manufacturers responsibility. Enquiries as to the availability of third party certification to support such claims should be addressed to the Director, Quality
40、 Assurance Division, BSI, PO Box375, Milton Keynes MK146LO for certification marks administered by BSI or to the appropriate authority for other certification marks.BS4764:1986 BSI 10-1999 3 Appendix A Preparation of coated test panels A.1 Apparatus and materials A.1.1 Test panels of asbestos-cement
41、 3)(see note), complying with BS690-2, with nominal dimensions150mm 100mm 5mm. WARNING. Asbestos-cement dust is a health hazard. Ensure that the operator and environment are protected from any dust which may be produced. In all cutting and handling operations, avoid the use of power tools and ensure
42、 that the dust is not inhaled. Prepare panels either by wet cutting or by scribing and breaking. The wearing of suitable respirators (see BS4275) is recommended. It is essential to refer to current legislation on asbestos and to the current editions of the Health and Safety Executive Guidance Notes
43、EH10, EH36 and EH44 4) . NOTEIf, by agreement between the supplier and the purchaser, test panels of an alternative substrate material are to be used, this material should be essentially cementitious and should have, when tested as described in BS4624, a water-absorption comparable to that for the a
44、sbestos-cement panels. A.1.2 Curing boxes of a non-corrodible material with airtight lids. Polyethylene food boxes with the dimensions225 25mm long,175 25mm wide and80 12.5mm deep, have been found to be suitable. A.1.3 Frames, made of an inert material (a suitable material is6mm 6mm poly methylmetha
45、crylate strip) to support the test panels horizontally at a distance of25 2.5mm below the under surface of the lid of the curing box(A.1.2). A.2 Test procedure A.2.1 Preparation of test panels. Immediately before use, immerse the test panels in water for241h. Remove the panels from the water and wip
46、e off excess water with a clean dry cloth. A.2.2 Preparation of the curing boxes for use. Place into each curing box(A.1.2), a frame(A.1.3) and a saturated aqueous sodium chloride solution containing excess salt so that the level of the solution will be50 5mm below the under surface of the lid. Repl
47、ace the lid. Maintain the boxes at23 2 C. A.2.3 Preparation of the paint. Ensure that the room is at23 2 C and that all the materials are conditioned at this temperature before mixing. Mix the sample of paint according to the manufacturers instructions; if a range of proportions of paint to water is
48、 given, use the mean proportion. Allow the paint to stand for30 5min and then remix it immediately before application. NOTETo aid adequate mixing, a minimum of100g of the dry cement paint should be taken. A.2.4 Coating and curing of test panels. Coat the rough textured side of each of the washed tes
49、t panels(A.2.1) with the paint, by means of a brush, to give a spreading rate of51m 2 /kg of the dry film mass. Immediately after coating, place each test panel in a curing box so that the painted surface is facing downwards. NOTEThe box should remain open for as short a time as possible. Remove each test panel after24 0.5h and apply a second coat of paint. Cure in the same way for a further24 0.5h, remove the panel and allow it to dry. Appendix B Determination of film properties B.1 Apparatus and materials B.1.1 Hard-drying time apparatus, complying
