1、BRITISH STANDARD BS1070:1993 Specification for Black paint (tar-based)BS1070:1993 This British Standard, having been prepared under the directionof the Surface Treatments and Coatings Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15Septemb
2、er1993 BSI 10-1999 First published December1942 Second edition May1956 Third edition April1973 Fourth edition September1993 The following BSI references relate to the work on this standard: Committee reference STC/27 Draft for comment92/58252 DC ISBN 0 580 22400 7 Committees responsible for this Bri
3、tish Standard The preparation of this British Standard was entrusted by the Surface Treatments and Coatings Standards Policy Committee (STC/-) to Technical Committee STC/27, upon which the following bodies were represented: Aluminium Finishing Association Aluminium Window Association British Railway
4、s Board British Telecommunications plc Consumer Policy Committee of BSI Department of the Environment (Building Research Establishment) European Resin Manufacturers Association Institute of Corrosion METCOM Ministry of Defence National Federation of Painting and Decorating Contractors Oil and Colour
5、 Chemists Association 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 CommentsBS1070:1993
6、 BSI 10-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Description 1 4 Sample 1 5 Consistency 1 6 Application properties and drying time 1 7 Finish 1 8 Corrosion resistance 1 9 Bend test requirement 1 10 Water content 1 11 Loss on heating 2 12 F
7、lashpoint 2 13 Keeping properties 2 14 Marking 2 Annex A (normative) Method of test for application properties and drying time 3 Annex B (normative) Determination of water content by the Dean and Stark method 3 Annex C (informative) Recommendations for use of tar-based paint 3 List of references Ins
8、ide back coverBS1070:1993 ii BSI 10-1999 Foreword This British Standard has been prepared under the direction of the Surface Treatments and Coatings Standards Policy Committee and supersedes BS1070:1973, which is withdrawn. This British Standard gives requirements for black tar-based paints for use
9、as a protective rather than a decorative finish. Such paints are intended for application to the usual constructional metals, but may also be used on other materials; the resulting film will, however, depend upon the type and condition of the surface and the method of application employed. When appl
10、ied over other types of paint special precautions could be needed as indicated in the general recommendations for the use of tar-based paint, which are set out in Annex C. Tests for the uniformity and corrosion resistance of the film are included, but it has not been found possible to develop satisf
11、actory accelerated tests for durability. This standard was first published in1942 and was revised in1956, when a further type of paint, type3, was added. The1973 edition covered materials of types2 and3 (now designated types A and B respectively). Type1 was omitted as it was slow drying and very lit
12、tle used. The changes in this1993 edition are the replacement of carburetted water-gas tar by steam cracker tar and the use of high boiling high aromatic hydrocarbon solvent in place of volatile coal tar distillate as a solvent for the tars. A British Standard does not purport to include all the nec
13、essary 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 document comprises a front cover, an inside front cover, pagesi andii, pages1
14、 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.BS1070:1993 BSI 10-1999 1 1 Scope This British Standard specifies requirements for the pr
15、operties and general composition of black tar-based paints. The standard is restricted to paints for cold application, based on coal tars and steam cracker tar or blends of these but not containing pigments or extenders. It does not include emulsions, stoving paints or paints designed solely for app
16、lication by dipping. Two types of paint, type A and type B, differing in their rates of drying, are specified. 2 References 2.1 Normative references This British Standard incorporates, by reference, provisions from specific editions of other publications. These normative references are cited at the
17、appropriate points in the text and the publications are listed on the inside back cover. Subsequent amendments to, or revisions of, any of these publications apply to this British Standard only when incorporated in it by updating or revision. 2.2 Informative references This British Standard refers t
18、o another publication that provides information or guidance. The edition of this publication current at the time of issue of this standard is given on the inside back cover but reference should be made to the latest edition. 3 Description The material shall be a homogeneous black solution consisting
19、 of a base prepared from coal tar or steam cracker tar or a blend of these, together with either volatile coal tar distillate or high boiling high aromatic hydrocarbon solvent derived from petroleum. The material shall be one of the types indicated in clause6. 4 Sample For the purpose of the tests d
20、escribed below, representative samples measuring not less than1l shall be taken and packed by the method described in BS3900-A1:1992. 5 Consistency The material shall be supplied in a condition suitable for application by brush. The material shall have a time of flow to collect50ml of45s 15s, when m
21、easured by the method described in BSEN535:1991 using a No.4cup. 6 Application properties and drying time The material, when applied in the manner described in Annex A, shall give a uniform film, without sagging on to the unpainted section, which shall permit the satisfactory application of a second
22、 coat of paint after not more than the following periods: Type A (normal drying)8h Type B (quick drying)4h 7 Finish When two coats of paint are applied to a panel, as described in Annex A, and allowed to dry, the resulting film, shall be smooth, glossy, continuous and free from runs and sags. 8 Corr
23、osion resistance When the material is tested by the method described in BS3900-F4:1968, amplified as follows in relation to the preparation of the test panel: a) using a single coat; b) applied by brush; c) applied to give a dry film mass of35g/m 2 5g/m 2 ; d) dried horizontally for48h before testin
24、g under conditions of23 C 2 C and a relative humidity of50% 5%; and then examined after a period of7days, the metal shall show no signs of corrosion. 9 Bend test requirement When the material is tested by the method described in BS3900-E1:1970, using the type1 apparatus with a10mm mandrel and amplif
25、ied as follows in relation to the preparation of the tinplate test panel: a) using a single coat; b) applied by brush; c) applied to give a dry film mass of35g/m 2 5g/m 2 ; d) dried horizontally for96h before testing under conditions of23 C 2 C and a relative humidity of50% 5%; the film shall show n
26、o signs of cracking or detachment from the substrate. 10 Water content The material shall contain not more than0.5%(m/m) of water when tested by the method described in Annex B.BS1070:1993 2 BSI 10-1999 11 Loss on heating The loss on heating of the material, when determined by the method described i
27、n BS3900-B2:1970 but using a temperature of145 C to150 C, shall not exceed50%(m/m). 12 Flashpoint When the material is tested by the method described in BS3900-A8:1986, the flashpoint of the material shall be not lower than33 C. 13 Keeping properties The material, when stored at normal room temperat
28、ure in the original sealed containers, shall retain the properties detailed above for a period of at least6months from the date of delivery or such other period as may be agreed between the purchaser and the vendor. 14 Marking All containers shall be marked with the manufacturers name or trade mark,
29、 the number of this British Standard, i.e.BS1070:1993 1)and the type of paint according to the classification in clause6. In addition, the following warning notice shall be clearly marked on the containers. “This paint has a tar base and contains aromatic solvents. It must be used only in conditions
30、 of good ventilation. The use of a suitable barrier skin preparation by operatives is recommended.” 1) Marking BS1070:1993 on or in 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 t
31、he standard. The accuracy of the claim is solely the claimants responsibility. Such a declaration is not to be confused with third party certification of conformity, which may also be desirable.BS1070:1993 BSI 10-1999 3 Annex A (normative) Method of test for application properties and drying time A.
32、1 Use a300mm 300mm burnished steel panel1.25mm thick, prepared in accordance with the method described in BS EN605:1992. A.2 On the prepared surface of the panel draw a line parallel to the bottom edge and50mm from it. A.3 Transfer not less than100ml of the thoroughly mixed paint to a suitable clean
33、 container and weigh it, together with a clean paint brush5mm in width, to the nearest0.1g. Work the paint into the brush and apply it as rapidly as possible in an even film to cover exactly the250mm by300mm area. Immediately reweigh the container, paint and brush and calculate the mass of the wet f
34、ilm by difference. From this and the non-volatile content determined as described in clause11, calculate the mass of the dry film which should be within the range35g/m 2 5g/m 2 . If the mass of the film is outside this range, prepare a fresh panel. A.4 Allow the painted panel to stand in a vertical
35、position in a well ventilated room reasonably free from dust with the painted surface outermost and not exposed to direct sunlight. The panel should be allowed to dry at23 C 2 C and a relative humidity of50% 5%. A.5 At the end of the period specified (seeclause6), examine the panel for appearance an
36、d freedom from sagging on to the area below the line. Apply a second coat immediately and allow to dry. Again examine the dried film for appearance and freedom from sagging. Annex B (normative) Determination of water content by the Dean and Stark method B.1 Apparatus B.1.1 All-glass Dean and Stark a
37、pparatus, conforming to BS756:1952, employing a flask of500ml capacity and a receiver of2ml capacity, both of which have been previously cleaned and dried. NOTEIt is important that the receiver and condenser should be thoroughly clean. They should, therefore, be treated with a mixture of potassium d
38、ichromate and sulfuric acid or other suitable cleansing agent prior to use. When the apparatus is in constant use it is usually sufficient to clean it after every third determination. B.2 Reagents B.2.1 Either amyl acetate, conforming to BS552:1970 or ethyl acetate, conforming to BS553:1990. B.2.2 T
39、oluene B.3 Procedure Weigh into the flask100g of the material under test, add100ml of the toluene and1ml of the amyl acetate or ethyl acetate and mix the contents of the flask well. Pour toluene into the receiver up to the level of the side tube. Connect the flask to the apparatus and immerse it in
40、an oil bath containing sufficient heavy mineral oil to cover the flask nearly to the neck. Heat the oil bath to such a temperature as to keep the contents of the flask boiling briskly. Continue the distillation until no further water collects in the receiver. At the conclusion of the determination r
41、elease any water still clinging to the condenser tube, causing it to fall into the receiver, by pushing a wire, or a small camel-hair brush attached to a glass rod, through the condenser tube from the top. Dislodge any condensed water on the sides of the receiver after dismantling the top part of th
42、e apparatus. Read off the amount of water collected in the receiver to the nearest0.05ml. B.4 Test report The result shall be reported as the percentage of water(m/m) in the material. B.5 Precision Results of duplicate determinations should not differ by more than the following amounts: Annex C (inf
43、ormative) Recommendations for use of tar-based paint C.1 General C.1.1 Tar-based paints protect a surface by the exclusion of moisture or other corrosive agents. The main function of the paint is thus to provide a waterproof film and for this purpose it is important that it should be applied in suit
44、able atmospheric conditions when the surface is clean and dry, and in such a manner as to give a continuous film of adequate thickness. Repeatability Reproducibility 0.05ml 0.01mlBS1070:1993 4 BSI 10-1999 C.1.2 While tar-based paints are used mainly for the protection of iron and steel they are also
45、 suitable for application to many building surfaces. However, as already stated, it is essential that their method of use suits the type of surface. Where this is non-porous, it is recommended that application should be by brushing at a spreading rate of from12.0m 2 /l to16.0m 2 /l. The paint is sup
46、plied in a suitable condition for application at this rate. In no circumstances should any petroleum thinners such as white spirit or paraffin be used, as these are not compatible with coal tars and could cause flocculation of the paint; if thinning becomes necessary, e.g.in cold weather, coal tar n
47、apthas or the special thinners supplied by the manufacturer should be used. C.1.3 Brushes should be cleaned immediately after use. The recommended thinners may be used for this purpose or the brushes may be wiped as free from paint as possible, washed with solvent and then with soap and warm water.
48、White spirit or paraffin should not be used. C.1.4 While there is no evidence of harmful effects arising from brushing tar-based paints in the open, they are not recommended for use in confined situations unless steps are taken to provide adequate ventilation. Similarly, the application of these pai
49、nts by spraying is not recommended if there is any risk of the operator breathing the fine mist that accompanies this form of application or of becoming seriously contaminated with it. C.1.5 The use of a suitable barrier skin preparation to protect the hands of the operator is recommended. C.2 Preparation of surfaces 2) C.2.1 Bare non-porous surfaces All dirt and grease should be removed from the surface in the case of metals; loose or broken mill scale and corrosion products should also be removed and painting should immediately follow cleaning. C
