1、BRITISH STANDARD BS 3416:1991 Reprinted, incorporating Amendment No. 1 Specification for Bitumen-based coatings for cold application, suitable for use in contact with potable waterBS3416:1991 This British Standard, having been prepared under the direction of the Pigments, Paintsand Varnishes Standar
2、dsPolicy Committee, waspublished under the authorityof the Standards Boardand comes into effecton 31October 1991 BSI 02-1999 First published October 1961 Second edition January 1973 Third edition December 1988 Fourth edition October 1991 The following BSI references relate to the work on this standa
3、rd: Committee reference PVC/27 Draft for comment 91/51890 DC ISBN 0 580 20006 X 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 Committee PVC/27, upon which t
4、he following bodies were represented: Aluminium Federation Aluminium Finishing Association Aluminium Window Association British Railways Board British Telecommunications plc Consumer Policy Committee of BSI Department of the Environment (Building Research Establishment) European Resin Manufacturers
5、Association Institute of Corrosion Institute of Metal Finishing Institution of Structural Engineers Institution of Water and Environmental Management (IWEM) London Regional Transport Metcom Ministry of Defence National Federation of Painting and Decorating Contractors Oil and Colour Chemists Associa
6、tion Paint Research Association Paintmakers Association of Great Britain Ltd. Society of Chemical Industry Steel Window Association Union of Construction, Allied Trades and Technicians Zinc Development Association Amendments issued since publication Amd. No. Date Comments 7288 September 1992 Indicat
7、ed by a sideline in the marginBS 3416:1991 BSI 02-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Classification 1 4 Sampling 1 5 Flash point 1 6 Drying and over-coating times 1 7 Finish 1 8 Protection against corrosion 2 9 Bend resistance 2 10
8、Effect on potable water 2 11 Shelf life 2 12 Marking 2 Appendix A Guidance on the use of bitumen-based coatings for cold application 3 Appendix B Methods of test for performance requirements 4 Appendix C Preparation and coating of test panels 5 Publication(s) referred to Inside back coverBS3416:1991
9、 ii BSI 02-1999 Foreword This British Standard was prepared under the direction of the Pigments, Paints and Varnishes Standards Policy Committee. It supersedes BS 3416:1988, which is withdrawn. This edition introduces technical changes but it does not reflect a full review or revision of the standar
10、d, which will be undertaken in due course. The main technical changes are: a) introduction of separate immersion periods for type 1 and type 2 materials; b) a change in the size of the panel used in Appendix B. NOTEDifferences in the text between this edition and BS 3416:1988 are indicated by a line
11、 in the margin. This edition includes provisions to satisfy the requirements of EEC Directive 80/778/EEC “The quality of water intended for human consumption” which specifies admissible concentrations and guide levels for a wide range of parameters in respect of all drinking water and water used in
12、food and drink manufacture. It applies to the water at the point where it is made available to the user. Compliance with the EEC Directive is required by UK law. The statutory water supplier has a responsibility to ensure that the components of the water service connected to the water supply do not
13、adversely affect the quality of the water supplied if that water is likely to be ingested or could be back syphoned into a part of the service from which it is likely to be ingested. The various water authorities will therefore require evidence that bitumen-based coatings in contact with potable wat
14、er are satisfactory in this respect. All types and classes of bitumen-based coatings in BS 3416 give films that are suitable for use in contact with potable water and that may be submitted for approval by the UK Water Fittings Byelaws Scheme administered by the Water Research Centre, 660 Ajax Avenue
15、, Slough, Berkshire SL1 4BG. This British Standard also takes account of recent developments in this type of paint enabling the use of mineral fillers and alternative solvents. This British Standard specifies requirements for two types of bitumen coatings for cold application, each type having three
16、 classes relating to the solvent system used for the solution. Attention is drawn to BS 6949, which specifies requirements for bitumen-based coatings not intended for use in contact with potable water. Guidance on the use of these materials is given in Appendix A, and reference should also be made t
17、o BS 5493 and to BS 6150. Product certification. Attention is drawn to the fact that bitumen-based coatings for use in contact with potable water must be certified by the Water Research Centre under the UK Water Fittings Byelaws Scheme in order to comply with EEC Directive 80/778/EEC. For full detai
18、ls, apply to the Water Research Centre, 660 Ajax Avenue, Slough, Berkshire SL1 4BG. 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 itse
19、lf confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 to 6, 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 ind
20、icated in the amendment table on theinside front cover.BS3416:1991 BSI 02-1999 1 1 Scope This British Standard specifies performance and marking requirements for a range of bitumen-based solvent-borne coatings. It covers coatings for cold application by either brushing, spraying, rolling or dipping
21、processes intended to give a coat for the corrosion protection and water-proofing of substrates including iron and steel. Two types, each with three classes, are included. All of these give films that are suitable for use on potable water tanks and cisterns as well as for general applications. The l
22、evel of gloss of the finished film is not specified in this British Standard. NOTE 1 These bitumen coatings are neither intended to withstand hot conditions, as on boilers, smoke stacks, etc., for which special coatings should be obtained, nor to resist contamination with mineral oils or paint solve
23、nts, all of which conditions will cause softening of the film. NOTE 2 Guidance on the use of bitumen-based coatings is given in Appendix A, BS 5493 and BS 6150. NOTE 3 The titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of t
24、his British Standard, the definitions given in BS 2015 apply together with the following. 2.1 bitumen a viscous liquid, or a solid, consisting essentially of hydrocarbons and their derivatives, which is soluble in trichloroethylene and is substantially non-volatile and softens gradually when heated.
25、 It is black or brown in colour and possesses waterproofing and adhesive properties. It is obtained by refinery processes from petroleum, and is also found as a natural deposit or as a component of naturally occurring asphalt in which it is associated with mineral matter NOTEThe international defini
26、tion of bitumen relates its solubility to carbon disulphide but, in the United Kingdom, the safer material trichoroethylene is used as the test solvent as examination has shown no significant difference. 2.2 bitumen-based coating a liquid mixture of bitumen in a carrier (solvent or solvent mixture),
27、 usually paraffinic hydrocarbons, chlorinated hydrocarbons and aromatic hydrocarbons, with or without fillers, to give a consistency suitable for brushing, spraying, rolling or dipping in accordance with the recommendations of the manufacturer. The coating may exhibit thixotropy 3 Classification 3.1
28、 Bitumen-based coatings shall be classified into two types as follows. a) Type 1, without fillers. b) Type 2, with fillers. 3.2 Each type shall be further sub-classified as follows. a) Class A, using white spirit complying with BS 245 as the carrier. b) Class B, using either a solvent other than whi
29、te spirit, or a solvent mixture with a flash point of or above 21C and below 32C as the carrier. c) Class C, using either a solvent other than white spirit, or a solvent mixture with a flash point of or above 32C as the carrier. 4 Sampling Take and store in accordance with BS 3900-A1 representative
30、samples of not less than 1000 mL of the coating either at the filling stage or from one or more previously unopened containers. Condition the samples for at least 12 h at 23 2 C before carrying out any tests. 5 Flash point When tested in accordance with B.1, coatings shall comply with the following.
31、 a) Coatings of classes A and C shall not flash at a temperature below 32C. b) Coatings of class B shall not flash at a temperature below 21C. 6 Drying and over-coating times 6.1 Surface-dry time When tested in accordance with B.2.1, films of coatings shall be surface dry: a) if type 1, in not more
32、than 4 h; b) if type 2, in not more than 8 h. 6.2 Over-coating time When tested in accordance with B.2.2, the film shall show no cissing, crawling, sinking, lifting or wrinkling during application or after 24 h drying time. 7 Finish When tested in accordance with B.3, the film shall be smooth, opaqu
33、e and free from sags or runs or other surface imperfections.BS3416:1991 2 BSI 02-1999 8 Protection against corrosion 8.1 Resistance to tap water immersion 8.1.1 When tested in accordance with B.4.1.1, the film shall remain completely adherent to the substrate. Any blistering shall not exceed rating
34、2 (S3) in accordance with BS 3900-H2. 8.1.2 When tested in accordance with B.4.1.2, the surface of exposed metal revealed shall show no visible rust or pitting. 8.2 Resistance to artificial sea water immersion 8.2.1 When tested in accordance with B.4.2.1, the film shall show no signs of breakdown. A
35、ny blistering shall not exceed rating 2 (S3) in accordance with BS 3900-H2. 8.2.2 When tested in accordance with B.4.2.2, the surface of exposed metal revealed shall show no visible rust or pitting. 9 Bend resistance When tested in accordance with B.5, the film shall show no signs of cracking or of
36、becoming detached from the substrate. 10 Effect on potable water A coating of the product applied and left to dry in accordance with the manufacturers instructions shall comply with BS 6920-1:1988. 11 Shelf life The product, if stored in unopened containers for 12 months at a temperature not exceedi
37、ng 30C, shall meet the requirements of clauses 5 to 9. No separation shall take place which cannot be removed by stirring. NOTE In the case of thixotropic coatings, sufficient time, as advised by the manufacturer, should be allowed after any stirring to redevelop the thixotropy. 12 Marking Each cont
38、ainer of bitumen-based coating shall be clearly labelled with the following information: a) the manufacturers identification; b) the number of this British Standard and the appropriate type and class of the product, e.g. BS 3416:1991 1) , type 1, class A; c) a statement that it is suitable for use i
39、n contact with potable water; d) the nominal content by mass or volume; e) the batch number from which the container was filled; f) the month and year in which the batch was manufactured; g) whether the coating is suitable for brushing, spraying, rolling or dipping. 1) Marking BS 3416:1991 on or in
40、relation to a product represents a manufacturers declaration of conformity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of such a claim is therefore solely the responsibility of the person making the claim. Such a declaration
41、 is not to be confused with third party certification of conformity, which may also be desirable.BS3416:1991 BSI 02-1999 3 Appendix A Guidance on the use of bitumen-based coatings for cold application A.1 Safety instructions Consult the safety instructions of the manufacturer before application and,
42、 especially, before spraying these materials. NOTE Attention is drawn to the Health and Safety Executive Guidance Note GS5 “Entry into Confined Spaces” regarding the safe working in confined spaces. A.2 General properties Like some other protective coatings referred to in BS 5493 and BS 6150, bitume
43、n coatings are used to protect surfaces rather than to decorate them, their function being to exclude moisture or other corrosive agents. It is thus important that each coat is applied in a continuous manner, without holidays or “misses”. Bitumen coatings have little power to inhibit corrosion. Henc
44、e, if ferrous surfaces are not adequately cleaned to be free from rust and mill-scale before these coatings are applied, under-rusting may occur with consequent failure of the film. They have good adhesion to most surfaces commonly found in building, e.g. ferrous metals, slightly etched galvanized i
45、ron and steel, concrete and brick, and will withstand moderate concentrations of acids and alkalis. These bitumen coatings are neither intended to withstand hot conditions, as on boilers, smoke stacks, etc., for which special coatings should be obtained, nor to resist contamination with mineral oils
46、 or paint solvents, all of which conditions will cause softening of the film. A.3 Precautions Provide adequate ventilation, particularly of closed vessels, while the material is being applied and until it is thoroughly dry. The use of air fed masks for personal ventilation is recommended. When paint
47、ing the interiors of tanks, use a forced air supply to disperse the solvent and prevent residual solvent condensing on the coating and washing it off. Avoid naked lights in or near the tanks or cisterns during these periods. Use appropriate barrier creams and protective clothing to prevent skin sens
48、itization. Skin should be thoroughly washed and clothing removed and cleaned as soon as possible after the work has been completed. A.4 Durability The durability of bitumen coatings depends mainly upon a) the thickness of the film and b) the degree of exposure. It is important to apply the products
49、liberally in a number of coats, as thick films give proportionately greater protection than thin ones, and to ensure that all areas of a surface are covered. The degree of exposure largely controls the rate of deterioration of the film surface. Bitumen is sensitive to sunlight and other strong light, which quickly cause complete loss of gloss, followed later by a form of chalking. This is, however, confined to the surface and provided that the film is of adequate thickness it will continue to give protection. In situations protected from such attack, the gloss is main
