1、BRITISH STANDARD BS 3900-A16: 1986 ISO 7254: 1984 Methods of test for paints Part A16: Determination of natural spreading rate by brush application ISO title: Paints and varnishes Assessment of natural spreading rate Brush application It is recommended that this Part be read in conjunction with the
2、general information in the Introduction to BS3900, issued separately. UDC 667.612:667.612.62:667.644.2BS3900-A16:1986 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
3、 intoeffect on 31 October 1986 BSI 10-1999 The Committees responsible for this British Standard are shown inBS3900: Introduction. The following BSI references relate to the work on this standard: Committee reference PVC/10 Draft for comment 82/55557 DC ISBN 0 580 15367 3 Amendments issued since publ
4、ication Amd. No. Date of issue CommentsBS3900-A16:1986 BSI 10-1999 i Contents Page National foreword ii 0 Introduction 1 1 Scope and field of application 1 2 References 1 3 Definition 1 4 Apparatus 1 5 Sampling 1 6 Test panels 1 7 Procedure 1 8 Report 2 Publications referred to Inside back coverBS39
5、00-A16:1986 ii BSI 10-1999 National foreword This Part of BS3900 has been prepared under the direction of the Pigments, Paints and Varnishes Standards Committee. It is identical with ISO7254:1984 “Paints and varnishes Assessment of natural spreading rate Brush application”, published by the Internat
6、ional Organization for Standardization (ISO). Terminology and conventions. The text of the International Standard has been accepted as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; at
7、tention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. In British Standards, it is current practice to use the symbol “L” for litre (and in its submultiples) rat
8、her than “l”. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. The Technical Committee has reviewed the provisions of ISO3270:1984, to whichreference is made in the text, and has decided that they are acceptable foruse in conj
9、unction with this standard. There is at present no British Standard equivalent to the 1984 edition of ISO3270 (although the 1974 edition of ISO3270 is given as a National appendix toBS3900-C8:1978), but it is intended to implement ISO3270:1984 in a revision of BS 3900 “General introduction”. Additio
10、nal information. The revision of ISO1514, referred to in the footnote to clause 2, was published in 1984. 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 Sta
11、ndard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding British Standard BS 3900 Methods of test for paints ISO 1512:1974 Part A1:1970 Sampling (Technically equivalent) ISO 1513:1980 Part A2:1983 Examination and preparation of samples fo
12、r testing (Identical) ISO 1514:1984 Part A3:1986 Standard panels for paint testing (Identical) ISO 2811:1974 Part A12:1975 Determination of density (Technically equivalent) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 and 2, an inside back cov
13、er 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.BS3900-A16:1986 BSI 10-1999 1 0 Introduction This International Standard is one of a series of standards dealing
14、with the sampling and testing of paints, varnishes and related products. For any particular application, the method of test described in this International Standard needs to be completed by the following supplementary information. This information should be derived in part or totally from an (inter)
15、national standard or other document related to the product under test or, if appropriate, should be agreed between the interested parties. a) Material, thickness and surface preparation of the substrate. b) The method of expressing the natural spreading rate (see clause 3). c) The attitude of the te
16、st surface, i.e. whether horizontal or vertical. d) The temperature of application of the paint or varnish. 1 Scope and field of application 1.1 This International Standard describes a method for assessing the natural spreading rate of application of a product (in terms of area per wet film mass or
17、area per wet film volume, as appropriate) when applied by brush to test panels. 1.2 The method is not suitable for products that contain highly volatile solvents. NOTEThe results are dependent on the type and nature of the substrate. Although consistent results may be obtained by one operator, care
18、should be taken if results between operators and between laboratories are to be compared. In such circumstances, the use of a common reference product is recommended. 2 References ISO 1512, Paints and varnishes Sampling. ISO 1513, Paints and varnishes Examination and preparation of samples for testi
19、ng. ISO 1514, Paints and varnishes Standard panels for testing 1) . ISO 2811, Paints and varnishes Determination of density. ISO 3270, Paints and varnishes and their raw materials Temperatures and humidities for conditioning and testing. 3 Definition For the purpose of this International Standard, t
20、he following definition applies: natural spreading rate the average area per wet film mass or the average area per wet film volume when applied uniformly by a skilled operator using a brush to give a film free from runs, sags and tears NOTEThe natural spreading rate is expressed either in m 2 /kg (a
21、rea per mass) or m 2 /l (area per volume). 4 Apparatus 4.1 Brush, of good quality hog bristle or nylon monofilament, about 50mm wide. A new brush should not be used for the preparation of test panels, but one that has been conditioned by previous use. 4.2 Balance, accurate to 10mg. 5 Sampling Take a
22、 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 the sample for testing as described in ISO1513. 6 Test panels Unless otherwise specified, the test panels shall comply with, and shall be prepared a
23、s described in, ISO1514. Unless otherwise specified the test panels shall be rectangular with sides300mm 600mm. NOTEBecause of the practical difficulty in accurately weighing the mass of product applied, the area of the test panel should be not less than0,1m 2 . 7 Procedure 7.1 Conditions of applica
24、tion For referee purposes and unless otherwise agreed, application shall be carried out in duplicate at23 2 C and a relative humidity of 505%. Seealso ISO3270. 7.2 Surface area Measure the linear dimensions of the test panel to an accuracy of1% and determine the surface area of the face to be painte
25、d. 1) At present at the stage of draft. (Revision of ISO1514:1974.)BS3900-A16:1986 2 BSI 10-1999 7.3 Assessment of spreading rate from wet film mass 7.3.1 Condition the brush (4.1) by applying some of the product under test to a clean surface, working the product well into the bristles. Immediately
26、weigh, to the nearest10mg, a container holding the conditioned brush and sufficient wet product to coat the test panel. 7.3.2 Apply the product to the panel as quickly as possible to give a film free from sags, runs or other defects. 7.3.3 Reweigh the brush and container. 7.3.4 Calculate the natural
27、 spreading rate (area per wet film mass) of the product from equation (1). where 7.4 Assessment of spreading rate from wet film volume 7.4.1 Determine the density of the product by the method described in ISO2811. 7.4.2 Carry out the procedure described in 7.3.1 to7.3.3. 7.4.3 Calculate the natural
28、spreading rate (area per wet film volume) of the product from equation (2). where 8 Report The report shall contain at least the following information: a) the type and identification of the product applied; b) a reference to this International Standard (ISO7254); c) the items of supplementary inform
29、ation referred to in the introduction to this International Standard; d) a reference to the (inter)national standard, product specification or other document supplying the information referred to in c) above; e) the results in terms of the stated requirements; f) any deviation, by agreement or other
30、wise, from the procedure specified; g) the date of the application of the product. . . . (1) A is the area, in square metres, of the test panel; m 1is the mass, in grams, of the container, brush and product, before application; m 2is the mass, in grams, of the container, brush and product, after app
31、lication; S N (m)is the natural spreading rate, in square metres per kilogram. S N m () 1 000A m 1 m 2 - = . . . (2) A is the area, in square metres, of the test panel; is the density, in grams per millilitre, of the product; m 1is the mass, in grams, of the container, brush and product, before appl
32、ication; m 2is the mass, in grams, of the container, brush and product, after application; S N (V)is the natural spreading rate, in square metres per litre. S N V () 1 000A m 1 m 2 - =BS3900-A16:1986 BSI 10-1999 Publications referred to See national foreword.BS 3900-A16: 1986 ISO7254: 1984 BSI 389 C
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