1、BRITISH STANDARD CONFIRMED MARCH 1991 BS 1795:1976 ISO 3262:1975 Specification for Extenders for paints UDC 667.622.52BS1795:1976 This British Standard, having been prepared under the directionof the Pigments, Paints and Varnishes Industry StandardsCommittee, was published under the authority ofthe
2、Executive Board on 28May1976 BSI 04-2000 First published June 1952 First revision October 1965 Second revision May 1976 The following BSI references relate to the work on this standard: Committee reference PVC/1/11 Draft for comment 74/50392 ISBN 0 580 09074 4 Cooperating organizations The Pigments,
3、 Paints and Varnishes Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: British Colour Makers Association* Department of Industry Department of I
4、ndustry (Laboratory of the Government Chemist) Department of the Environment Department of the Environment (Building Research Establishment) Greater London Council Institution of Corrosion Technology London Transport Executive Ministry of Defence* National Federation of Builders and Plumbers Merchan
5、ts Oil and Colour Chemists Association* Paint Research Association* Paintmakers Association of Great Britain Limited* Post Office Royal Institute of British Architects Society of Chemical Industry Titanium Pigment Manufacturers Technical Committee* White Lead Manufacturers Association* Zinc Developm
6、ent 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: Amalgamated Society of Painters and Decorators Asbestine
7、 Importers Association Chemical Industries Association China Clay Association Mica Trade Association Paint Manufacturers and Allied Trades Association Ltd. Amendments issued since publication Amd. No. Date of issue CommentsBS1795:1976 BSI 04-2000 i Contents Page Cooperating organizations Inside fron
8、t cover Foreword ii 1 Scope and field of application 1 2 References 1 3 Definition 1 4 Types and grades 1 5 Composition and properties 2 6 Sampling 2 7 Comparison of colour 2 8 Determination of residue on sieve 2 9 Determination of particle size distribution 6 10 Determination of matter volatile at
9、105 C 10 11 Determination of loss on ignition 10 12 Determination of matter soluble in water 11 13 Determination of pH of aqueous suspension 13 14 Determination of barium sulphate in extenders Nos. 1 and 2 13 15 Determination of calcium carbonate content of extenders Nos. 3 and 5 15 16 Determination
10、 of calcium content of extender No. 4 and calcium and magnesium contents of extenders Nos. 6 and 10 16 17 Determination of silica in extender No. 18 17 Annex Oil absorption values Inside back cover Figure 1 Rose used for washing the residue on sieve 5 Figure 2 Sedimentation vessel and pipette 7 Tabl
11、e 1 Composition and properties of extenders 3 Table 2 Details for preparing dispersions for the determination of particle size 9 Table 3 Test method to be used for determination of matter soluble in water in each extender 11BS1795:1976 ii BSI 04-2000 Foreword This British Standard for extenders for
12、paints was first published in one volume in1952and subsequently revised in 1965. This revision brings the British Standard into line with ISO3262:1975, “Extenders for paints”. For the purposes of this British Standard the text of ISO3262given in this publication should be modified as follows. Termin
13、ology. The words “British Standard” should replace “International Standard” wherever they appear. The decimal point should replace the decimal comma wherever it appears. Cross-references. The references to other International Standards should be replaced by references to British Standards as follows
14、: 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. Clause Reference to ISO Standard Approp
15、riate British Standard Table 1 ISO 787-XVIII BS 3483 “Methods for testing pigments for paints” Part B4 “Determination of residue on sieve (water method, using a mechanical flushing procedure”) 6 ISO 842 BS 4726 “Methods for sampling raw materials for paints and varnishes” 8 ISO 48 BS 903 “Methods of
16、 testing vulcanized rubber” Part B6 “Total sulphur” (included in BS903-B6 to BS903-B10) 10 ISO 787-II BS 3483-B6 “Determination of matter volatile at 105 C” 12.2 ISO 787-III BS 3483-C1 “Determination of matter soluble in water (hot extraction method)” 13 ISO 787-IX BS 3483-C4 “Determination of pH va
17、lue of aqueous suspension” Annex ISO 787-V BS 3483-B7 “Determination of oil absorption value” Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1to 18, an inside back cover and a back cover. This standard has been updated (see copyright date) and may
18、 have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS1795:1976 BSI 04-2000 1 1 Scope and field of application This International Standard specifies the principal requirements and the corresponding methods of test for certain paint extenders. It
19、 is applicable to the types and grades of paint extender listed in clause4. 2 References ISO 787, General methods of test for pigments. ISO 842, Raw materials for paints and varnishes Sampling. 3 Definition extender an inorganic material in powder form, with a refractive index usually less than1,7,
20、used as a constituent of paints to confer special effects and to modify properties such as sedimentation, working and film-forming properties 4 Types and grades The extenders are classified in types according to the nature of the material, and in grades according to their residue on sieve and partic
21、le size. Extender No. 1: Barytes (grades a, b) Barium sulphate, natural. Extender No. 2: Blanc fixe Barium sulphate, precipitated. Extender No. 3: Whiting (grades a, b, c, d) Calcium carbonate, natural. Craie, Kreide. Naturally occurring cretaceous chalk, primarily CaCO 3of micro-crystalline form (e
22、ssentially remains of coccoliths and foraminifera). Extender No. 4: Calcium carbonate, crystalline (grades a, b, c, d) Limestone, Iceland spar, natural calcium carbonate other than that covered by extender No. 3. Extender No. 5: Calcium carbonate, precipitated (grades a, b) Calcium carbonate prepare
23、d by precipitation. Extender No. 6: Dolomite (grades a, b, c, d) Calcium magnesium carbonate. In chemical composition, approximately equimolecular proportions of calcium and magnesium carbonates. Extender No. 7: China clay (grades a, b, c) Aluminium silicate, natural, hydrated. Kaolin, essentially k
24、aolinite, Al 2 O 3 .2SiO 2 .2H 2 O, of lamellar crystalline form. Extender No. 8: Talc, fibrous form (grades a, b) Magnesium silicate, natural, hydrated, 3MgO.4SiO 2 .H 2 O. Extender No. 9: Talc, lamellar form (grades a, b, c) Magnesium silicate, natural, hydrated,3MgO.4SiO 2 .H 2 O. Extender No. 10
25、: Talc, containing carbonate Magnesium silicate, natural, hydrated, 3MgO.4SiO 2 H 2 O, lamellar form. Different from extender No. 9 in that it contains carbonate. Extender No. 11: Mica (grades a, b) Potassium aluminium silicate, natural, hydrated, K 2 O.3Al 2 O 3 .6SiO 2 .2H 2 O, lamellar form. Musc
26、ovite. Wet ground (grade a) and dry ground (grade b). Extender No. 12: Silica (quartzite), type 1 (gradesa, b, c, d) Silica, natural. SiO 2content not less than80% but less than98%.BS1795:1976 2 BSI 04-2000 Extender No. 13: Silica (quartzite), type 2 (gradesa, b, c, d) Silica, natural, SiO 2content
27、equal to or greater than98%. Extender No. 14: Kieselguhr, type 1 (grades a, b, c, d) Diatomaceous siliceous earth. SiO 2content not less than70% but less than80%. Extender No. 15: Kieselguhr, type 2 (grades a, b, c, d) Diatomaceous siliceous earth. SiO 2content not less than80%. Extender No. 16: Cal
28、cium silicate, synthetic Hydrated synthetic calcium silicate. Extender No. 17: Sodium aluminium silicate, synthetic Hydrated synthetic sodium aluminium silicate. Extender No. 18: Silica, synthetic Hydrated synthetic silica. 5 Composition and properties The material shall be in the form of a dry powd
29、er or in such condition that it may readily be reduced thereto by crushing under a palette knife without any grinding action being necessary. When examined microscopically at a suitable magnification, it shall closely resemble an agreed sample. The composition and properties of the materials shall b
30、e as given in Table 1. It should be noted, however, that in Table 1 no reference is made to oil-absorption values; these are given in the table in the Annex for information only. 6 Sampling Sampling shall be carried out in accordance with ISO 842. Methods of test All reagents used shall be of recogn
31、ized analytical reagent quality. Distilled water or water of equal purity shall be used throughout the tests. 7 Comparison of colour NOTEThere is no objection to the use of a particular instrumental method, agreed between the interested parties, for comparison of colour. However, in view of differen
32、ces between the results obtained with various instruments, the simple visual method is given as the reference method. 7.1 Procedure Place approximately equal masses of the test sample and the agreed sample on a ground glass plate placed on a piece of white paper. Place a piece of thin glass plate ve
33、rtically between the two samples so as to form a partition. Push the samples towards each other until they come into contact with the glass plate. Remove the glass plate and flatten the surface of the two heaps with another glass plate which shall then be removed before viewing. Examine the colour o
34、f the samples in diffuse daylight or, if good daylight is not available, make the comparison in artificial daylight. Add carefully a few drops of either white spirit or water (as agreed between the interested parties) in such a way that the two samples are just wetted without being disturbed, and re
35、peat the colour comparison by the same method as before. 8 Determination of residue on sieve 8.1 Apparatus 8.1.1 Three sieves, 100to200mm diameter, with sides of height50mm and meshes of apertures 45, 63 and125 m respectively. 8.1.2 Glass rod, tipped with rubber having a hardness of50IRHD 1) . 8.1.3
36、 Filter crucible of sintered glass, pore size index P 40 (diameter of pores16to40m). 1) See ISO 48, Vulcanized rubbers Determination of hardness.BS 1795:1976 BSI 04-2000 3 Table 1 Composition and properties of extenders Extender Residue on sieve a Particle size distribution b Matter volatile at 105
37、C Loss on ignition Matter soluble in water Composition % (m/m) Test method Colour (seeclause 7) (see clause 8) % (m/m) max. (see clause 9) % (m/m) min. (see clause 10) % (m/m) max. (see clause 11) % (m/m) (see clause 12) % (m/m) pH of aqueous suspension (seeclause 13) No. 125 m 63 m 45 m 20 m 10 m 5
38、 m 2 lm c max. 1 Barytes No extender to be darker or more strongly coloured than an agreed sample. grade a grade b BaSO 4 ,90 min. see clause 14 2,0 0,5 65 99 40 95 20 80 (5) (20) 0,5 0,5 max. 0,5 6 to 10 2 Blanc fixe BaSO 4 ,95 min. see clause 14 0,02 0,1 0,2 90 80 60 (25) 0,5 0,5 d 5,5 to 9,5 3 Wh
39、iting grade a grade b grade c grade d CaCO 3 ,96 min. 99 max. see clause 15 0,5 0,01 6 0,5 0,05 15 2 0,5 0,01 85 90 97 65 80 95 45 55 70 (20) (25) (35) 0,3 42 to 44 0,15 8,0 to 9,5 4 Calcium carbonate (crystalline) grade a grade b grade c grade d CaCO 3 ,98 min. see clause 16 0,01 0,01 1,0 0,5 0,01
40、5,0 1,5 0,1 0,01 70 80 95 40 45 65 98 25 30 35 70 (10) (10) (15) (25) 0,3 42 to 44,5 0,15 8 to 10 5 Calcium carbonate (precipitated) grade a grade b CaCO 3 ,97 min. 100 max. see clause 15 0,1 0,1 0,25 0,25 0,5 0,5 90 70 90 40 70 (20) 1,0 43,5 to 44,5 0,3 8 to 10,5 6 Dolomite grade a grade b grade c
41、grade d CaMg(CO 3 ) 2 , 97 min. e see clause 16 0,01 0,01 1,0 0,5 0,01 5,0 1,5 0,1 0,01 70 80 95 40 45 65 98 25 30 35 70 (10) (10) (15) (25) 0,3 46 to 48 0,2 8 to 10,5 7 Chine clay grade a grade b grade c 0,5 0,1 0,05 90 95 99,5 70 80 99 (15) (35) (70) 2 10 to 14 0,5 4,5 to 9,5 8 Talc, fibrous form
42、grade a grade b 1,5 0,5 75 90 55 75 40 50 (20) (25) 0,5 4 to 7 0,5 8,5 to 10 9 Talc, lamellar form grade a grade b grade c 0,01 0,5 0,01 3,0 0,10 0,01 80 95 50 70 95 30 40 70 (8) (15) (25) 0,5 4 to 8 0,5 8,5 to 10 10 Talc, containing carbonate grade a grade b grade c Magnesium silicate with a max. o
43、f 50 % MgCO 3+ CaCO 3 see clause 16 0,01 0,5 0,01 3,0 0,10 0,01 80 95 50 70 95 30 40 70 (8) (15) (25) 0,5 28 max. 0,5 8 to 10,5 11 Mica grade a grade b 1,0 3,0 0,5 98 98 80 70 30 30 (5) (10) 0,5 5,5 max. 0,5 7 to 9,5 BS 1795:1976 4 BSI 04-2000 Table 1 Composition and properties of extenders Extender
44、 Residue on sieve a Particle size distribution b Matter volatile at 105 C Loss on ignition Matter soluble in water Composition % (m/m) Test method Colour (seeclause 7) (see clause 8) % (m/m) max. (see clause 9) % (m/m) min. (see clause 10) % (m/m) max. (see clause 11) % (m/m) (see clause 12) % (m/m)
45、 pH of aqueous suspension (seeclause 13) No. 125 m 63 m 45 m 20 m 10 m 5 m 2 m c max. 12 Silica (quartzite) type 1 Any recognized classical method No extender to be darker or more strongly coloured than an agreed sample. grade a grade b grade c grade d SiO 2 , 80 to 98 40 2 25 0,5 60 5,0 0,1 70 10 9
46、5 0,5 5 max. 0,5 7 to 10 13 Silica (quartzite) type 2 grade a grade b grade c grade d SiO 2 , 98 min. 40 2 25 0,5 60 5,0 0,1 70 10 95 0,5 0,2 max. 0,5 7 to 8,5 14 Kieselguhr, type 1 grade a grade b grade c grade d SiO 2 , 70 to 80 15 5 1 1 70 75 80 90 10 20 30 50 5 10 30 12 15 max. 1,0 6,5 to 10 15
47、Kieselguhr, type 2 grade a grade b grade c grade d SiO 2 , 80 min. 15 5 1 1 70 75 80 90 10 20 30 50 5 10 30 2 1 max. 1,0 6,5 to 10 16 Calcium silicate, synthetic To be agreed between the interested parties 1,0 3,0 90 70 40 12 8 max. To be agreed between the interested parties 8 to 12,5 17 Sodium alu
48、minium silicate, synthetic 2,0 4,0 85 50 20 12 8 max. 8 to 12,5 18 Silica, synthetic SiO 2 , 97 min. see clause17 2,0 2,0 80 50 20 12 8 max. 3,5 to 8,0 a The determination of residue on sieve using the method in this International Standard requires considerable experience. More reproducible results may be obtained if a mechanical flushing meth
