1、BRITISH STANDARD BS3962-5: 1980 Methods of test for Finishes for wooden furniture Part 5: Assessment of surface resistance to cold oils and fats UDC 684.4.041.059.1:667.638.6:620.179.111.1BS3962-5:1980 This British Standard, having been prepared under the direction of the Pigments, Paints and Varnis
2、hes Standards Committee was published under the authority of the Executive Board and comes into effect on 30 May1980 BSI 03-1999 First published July1972 First revision May1980 The following BSI references relate to the work on this standard: Committee reference PVC/5 Draft for comment 77/53136 DC I
3、SBN 0 580 11341 8 Cooperating organizations The Pigments, Paints and Varnishes Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: British Colour Makers Assoc
4、iation Builders Merchants Federation Consumers Association* Department of the Environment (Building Research Establishment) Department of the Environment (PSA)* Department of Industry (Chemicals and Textiles) Department of Industry (Laboratory of the Government Chemist) Greater London Council London
5、 Transport Executive Ministry of Defence Oil and Colour Chemists Association Paint Research Association Paintmakers Association of Great Britain Ltd* Post Office Royal Institute of British Architects Society of Chemical Industry Titanium Pigment Manufacturers Technical Committee White Lead Manufactu
6、rers Association Zinc Development Association Zinc Pigment Development Association The organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Association of County Counc
7、ils British Woodworking Federation Department of Education and Science Department of the Environment (Joint Fire Research Organisation of the Department of the Environment and Fire Offices Committee) Furniture Industry Research Association Amendments issued since publication Amd. No. Date of issue C
8、ommentsBS3962-5:1980 BSI 03-1999 i Contents Page Cooperating organizations Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Principle 1 4 Apparatus and reagent 1 5 Test substances 1 6 Preparation of test surface 1 7 Test procedure 2 8 Assessment and reporting of results 2 Figure 1 Viewing c
9、abinet 3 Publications referred to Inside back coverBS3962-5:1980 ii BSI 03-1999 Foreword This Part of this British Standard has been prepared under the direction of the Pigments, Paints and Varnishes Standards Committee as one of a series of standard methods for testing and assessing the performance
10、 of finishes for wooden furniture. BS3962-5 was first published in1972 in the series of standard methods for testing the performance of clear finishes for wooden furniture. An increase in the use of pigmented finishes for furniture has now made it desirable to broaden the scope of the test method to
11、 include such finishes. In addition the opportunity has been taken to amend the rating code to align with international practice. The method is designed to test finishes for wooden furniture on which oils and fats may be spilt. It provides a method for comparing different finishes, but can also be u
12、sed to determine whether or not a sample complies with the requirements detailed in a product specification or other document. In view of the diversity of woods and finishing systems used in the furniture industry, it is impracticable to specify a uniform standard test substrate and method of prepar
13、ation of the finishing system. These should be the subject of agreement between the purchaser and the supplier. This method seeks only to stipulate a standard procedure for testing a wooden panel coated with the appropriate finishing system. Although the rating system used has been made as objective
14、 as possible, it still contains a large subjective component. Consequently, to cater for the inherent variability present when subjective decisions have to be made, it is recommended that not fewer than five observers should examine and assess the tested surface. Subject to agreement between the pur
15、chaser and the supplier, fewer observers may be used provided that these observers are experienced in this type of assessment. The rating in each test is the median value of the assessment of the observers, the assessments being determined by a procedure which is described in detail in clause8. A se
16、ries of such tests may be carried out using several different oils or fats as agreed between the purchaser and the supplier. No attempt has been made to assess the ease with which the finish may be restored. This Part of this British Standard describes a method of test only, to which reference may b
17、e made in a specification in which test conditions and acceptable performance levels have been specified. A statement that a wood finishing system complies with the requirements of BS3962 should not be used, as it is meaningless. Other Parts of this standard are: Part 1: Assessment of low angle glar
18、e by measurement of specular gloss at85 ; Part 2: Assessment of surface resistance to wet heat; Part 3: Assessment of surface resistance to dry heat; Part 4: Assessment of surface resistance to cold liquids; Part 6: Assessment of resistance to mechanical damage. A British Standard does not purport t
19、o 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 document comprises a front cover, an inside front cover,
20、 pagesi andii, pages1 to4, 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.BS3962-5:1980 BSI 03-1999 1 1 Scope 1.1 This Part of this British St
21、andard describes a method of test for assessing the resistance of a wood finishing system to marking by a cold oil or fat in contact with the finished surface. NOTEFor the purposes of this British Standard, the terms “wood” and “wooden” include the range of materials manufactured from wood, e.g.bloc
22、kboard, particle board, etc., used in the furniture industry. 1.2 The test may be used either as a means of comparing a number of finishing systems or as a control check test to ensure that a specified performance level is being achieved or maintained. 2 References The titles of the publications ref
23、erred to in this standard are listed on the inside back cover. 3 Principle Oil or fat is placed on the surface of the test panel and is removed after24h. The test area is then gently rubbed first with a soft absorbent cloth moistened with dilute cleansing liquid and then with another moistened with
24、water. The surface is finally wiped dry with a soft clean absorbent cloth and examined visually for signs of marking. The degree of marking of a test area is assessed by a number of observers by reference to a descriptive numerical rating code. The median value of the individual assessments determin
25、es the rating to be given to the finishing system for the specified test oil or fat. 4 Apparatus and reagent 4.1 Viewing cabinet. A suitable viewing cabinet is shown in Figure 1, and is constructed of approximately15mm thick blockboard, or other suitable material. The interior shall be painted matt
26、black. A25mm diameter hole is cut in the sloping side and a60W frosted lamp is positioned on the hinged platform so that the lamp rests directly over the hole. 4.2 Cleansing liquid, with the following composition: The concentrated liquid shall be stored in a glass bottle in a cool dark place and sho
27、uld be used within1 year of preparation. A diluted liquid is used in the test containing15ml of the above cleansing liquid in1litre of distilled or deionized water. It is essential that this dilute solution be freshly prepared on the day of use. 5 Test substances The test substances shall be agreed
28、between the purchaser and the supplier. 6 Preparation of test surface 6.1 Test panel. The test panel shall be of an agreed wooden substrate, substantially flat and of a size sufficient to comply with the requirements of7.1 regarding the separation of the small amounts of test substances. Example: fo
29、r three test substances, the minimum size of panel required is130mm 180mm. It is recommended that a sufficient area be prepared to allow for extra tests, if required. 6.2 Finishing of test panel. Apply the full finishing system by the appropriate method of application to an agreed wooden substrate,
30、suitably prepared and complying with the dimensions specified in6.1. The application rates of the individual coats of material, the drying period and conditions and the surface preparation between coats, e.g.sanding, shall be agreed between the purchaser and the supplier. percentage by mass a) the s
31、odium salt of an alkyl (C 10 C 14 ) aryl sulphonate; 12.5 b) polyoxyethylene ethers of primary or secondary alcohols, having between8 and16 carbon atoms, condensed with5 to15molecules of ethylene oxide per molecule of alcohol and having a cloud point of25 to75 C in1%(m/m) aqueous solution a ; 12.5 c
32、) ethanol b ; 5.0 d) distilled or deionized water; 70.0 a The determination of cloud point is described in BS3762. b Ethanol may be replaced for this purpose by industrial methylated spirits,74 OP, complying with the requirements of BS3591. It should be noted that the use of industrial methylated sp
33、irits is governed by The Methylated Spirits Regulations,1952 (SI1952, no.2230). It is not permissible to use duty-free ethanol, received under the provisions of the Customs and Excise Act1952, section111, for purposes for which industrial methylated spirits is an acceptable alternative to ethanol.BS
34、3962-5:1980 2 BSI 03-1999 6.3 Ageing of test panel. Allow the final coat to age at a room temperature not lower than15 C with free access of air for an agreed period before test. The period shall be not less than28days except for special purposes, in which case the period shall be agreed between the
35、 purchaser and the supplier. 7 Test procedure 7.1 Application of the test. Place on the panel the appropriate number of pools of oil or pats of fat, each approximately25mm in diameter and at23 2 C. At least two test areas per test substance shall be used, so arranged that no area has its centre near
36、er than40mm to any edge of the panel and the minimum distance between area centres is50mm. Note, by any suitable method, the test positions of each substance and ensure that the test positions for a particular test substance are as random as possible, and that they do not lie on the same grain struc
37、ture, if this is visible. Leave the panel undisturbed in an atmosphere free from draughts at23 2 C for24h. After this period of time, remove the oil or fat from the panel with soft absorbent paper or cloth. Wash the test surface by lightly rubbing it, first with a soft absorbent cloth moistened with
38、 the diluted cleansing liquid(4.2) and then with another moistened only with water. Finally, carefully wipe the surface dry with a clean, soft absorbent cloth. Wash and dry in the same way an area on the test panel that has not been exposed to the test oils or fats (reference area). 7.2 Examination
39、of test panel 7.2.1 Carefully compare each test area with the reference area in the viewing cabinet(4.1), using normal corrected vision, by the following procedure. Position the panel so that the test area to be examined is equidistant from the sides and about550mm from the back of the cabinet. Move
40、 the eye to bring the reflection of the lamp alongside the test area and further move it to cause the reflection to travel round the test area. In this way, any markings may be seen. 7.2.2 Carefully compare each test area with the reference area, either in good diffuse daylight with an illumination
41、of at least2 000lx, or in artificial daylight in a colour matching booth complying with the requirements of BS3900-D1. Note any signs of discoloration, change in lustre or other defects in the test area. 8 Assessment and reporting of results 8.1 Rating code. By comparison with the reference area, ra
42、te the test areas for each test substance by the methods described in7.2.1 and7.2.2, according to the following code: Report any colour change separately. NOTE 1Intermediate ratings, e.g.32 or2, should not be used. NOTE 2These ratings now align with international practice. This has the effect of inc
43、reasing each numerical rating by1 unit from that given in the previous edition of this standard (e.g.a rating of3 in this edition corresponds to a rating of2 previously). 8.2 Operation of rating code. It is recommended that each test area be rated according to the code given in8.1 by at least five o
44、bservers. The rating for a test area shall be the largest rating value which is equalled, or exceeded, by the majority of observers, e.g.: individual ratings1,2,3,3,3; test area rating:3 individual ratings1,2,2,3,3; test area rating:2 Duplicate test areas for each test substance shall be assessed se
45、parately. If the results differ, carry out a further test and report the discrepancy. 8.3 Reporting of results. The test report shall include at least the following information: a) a reference to this Part of this British Standard, i.e.BS3962-5; b) identification of the coating under test; c) the pr
46、oduct specification or other document supplying the test requirements and performance levels, if any; d) any deviation, by agreement or otherwise, from the specified test procedure, including the duration and the reasons, if known, for a special ageing period of less than28days; e) the required perf
47、ormance level and the result for each test substance, and any abnormality of results between the examination methods7.2.1 and7.2.2; f) the date of the test. Appearance of test area Rating No visible change 5 Slight change in lustre or a few isolated marks just visible 4 Complete test area just disti
48、nguishable 3 Marked change in appearance 2 Complete or partial removal of film 1BS3962-5:1980 BSI 03-1999 3 NOTEAll the dimensions are approximate Figure 1 Viewing cabinet4 blankBS3962-5:1980 BSI 03-1999 Publications referred to BS3591, Industrial methylated spirits. BS3762, Methods of sampling and
49、testing detergents. BS3900, Methods of test for paints. BS3900-D1, Visual comparison of the colour of paints. BS3962-5: 1980 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or e
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