《BS-5404-2-1977.pdf》由会员分享,可在线阅读,更多相关《BS-5404-2-1977.pdf(14页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS 5404-2: 1977 Specification for Plastics laboratory ware Part 2: Graduated measuring cylinders UDC 542.2:678.5 + 542.3:531.732 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:50:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5404-2:1977 This British Standard, having be
2、en prepared under the direction of the Laboratory Apparatus Standards Committee, was published under the authority of the Executive Board on 30 September 1977 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference LBC/28 Draft for comment 76/51532 DC ISBN 0
3、 580 09724 2 Cooperating organizations The Laboratory Apparatus Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Agricultural Research Council Association
4、for Science Education* Association of Scientific, Technical and Managerial Staffs British Laboratory Ware Association* British Lampblown Scientific Glassware Manufacturers Association British Pharmacopoeia Commission Chemical Industries Association Chemical Society Department of Health and Social Se
5、curity Department of Industry (Laboratory of the Government Chemist)* Department of Industry (National Physical Laboratory) Glass Manufacturers Federation Institute of Petroleum Ministry of Defence Pharmaceutical Society of Great Britain Scientific Instrument Manufacturers Association Society for An
6、alytical Chemistry Society of Chemical Industry Society of Glass Technology Standardization of Tar Products Test Committee 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 Briti
7、sh Standard: British Society of Scientific Glassblowers Consortium of Local Education Authorities for the provision of Science Equipment Institute of Medical Laboratory Science Medical Research Council Individual expert Amendments issued since publication Amd. No.Date of issueComments Licensed Copy:
8、 sheffieldun sheffieldun, na, Mon Dec 04 15:50:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5404-2:1977 BSI 11-1999i Contents Page Cooperating organizationsInside front cover Forewordii 1Scope1 2References1 3Basis of graduation1 4Series of nominal capacities1 5Definition of capacity1 6Accuracy1
9、7Material1 8Details of construction1 9Graduation and figuring2 10Inscriptions3 Appendix A Calibration of plastics measuring cylinders4 Appendix B Test for ionic material extracted by water at 20 C5 Appendix C Flexibility and recovery test for plastics cylinders5 Figure 1 General appearance of measur
10、ing cylinder6 Figure 2 Scales of measuring cylinders6 Figure 3 Scales of measuring cylinders6 Figure 4 General arrangement of equipment for flexibility test7 Table 1 Series of capacities, divisions and tolerances1 Table 2 Dimensions2 Table 3 Values of the quantity c in units of 105ml/g used in calib
11、ration4 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:50:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5404-2:1977 ii BSI 11-1999 Foreword This British Standard has been prepared under the direction of the Laboratory Apparatus Standards Commit
12、tee to provide for plastics graduated measuring cylinders of the type in general use in laboratories. It has been drawn up with reference to a Draft International Standard on laboratory glass graduated measuring cylinders, which, at the time of preparation of this British Standard, was being studied
13、 in ISO Technical Committee ISO/TC 48, Laboratory glassware and related apparatus. The details specified conform with ISO/R 384. Differences between this British Standard and the Draft International Standard on glass graduated measuring cylinders have been limited, in most instances, to those arisin
14、g from the differences in physical properties of the respective materials used in their construction. This British Standard specifies measuring cylinders intended for use with aqueous solutions at the reference temperature. Before using these measuring cylinders for strong acids and alkalis, oxidizi
15、ng agents or non-aqueous solutions or at other temperatures, users should satisfy themselves that the cylinders are suitable for such applications either by laboratory tests or by reference to the manufacturer or supplier. A British Standard does not purport to include all the necessary provisions o
16、f 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, pages i and ii, pages 1 to 8, an inside
17、 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. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:50:17 GMT+00:00 2006, Uncontrolled Copy, (c)
18、BSI BS 5404-2:1977 BSI 11-19991 1 Scope This British Standard specifies requirements for a series of plastics cylinders with a graduated volumetric scale and a pouring lip. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Basis of gradua
19、tion 3.1 Unit of volume. The unit of volume shall be the cubic centimetre (cm3), for which the name millilitre (ml) may be used. NOTEThe term millilitre (ml) is commonly used as a special name for the cubic centimetre (cm3), in accordance with a decision of the twelfth Confrence Gnrale des Poids et
20、Mesures. The term millilitre is acceptable, in general, for reference to capacities of volumetric glassware and is used in the present text. 3.2 Reference temperature. The standard reference temperature, i.e. the temperature at which the cylinder is intended to contain its nominal volume (nominal ca
21、pacity), should be 20 C. NOTEWhen it is necessary as in tropical countries to work at an ambient temperature considerably above 20 C, and users do not wish to use the standard temperature of 20 C, it is recommended that the reference temperature be 27 C. 4 Series of nominal capacities The series of
22、nominal capacities of graduated measuring cylinders shall be as shown in Table 1. Table 1 Series of capacities, divisions and tolerances 5 Definition of capacity 5.1 General case. The capacity corresponding to any graduation line shall be defined as the volume of water at 20 C, expressed in millilit
23、res, contained by the cylinder at 20 C when filled to that graduation line in accordance with the procedure given in A.1. 5.2 Special case. Where, exceptionally, the reference temperature is 27 C, this value shall be substituted for 20 C. 6 Accuracy There shall be one class of accuracy. When tested
24、in accordance with Appendix A the errors on capacity shall not exceed the maximum permitted errors shown in Table 1. The error represents the maximum permissible error at any point and also the maximum permissible algebraic difference between the errors at any two points. 7 Material 7.1 General. Cyl
25、inders shall be rigidly constructed of generally non-brittle transparent or translucent plastics material of suitable chemical and thermal properties and shall be as free as possible from moulding defects and stress. 7.2 Resistance to extraction of ionic material by water at 20 C. When tested in acc
26、ordance with the procedure given in Appendix B, the cylinder shall give an aqueous extract, free of suspended matter, and having a conductivity not more than 200 4S/m greater than that of the original water used for the extraction. NOTE200 4S/m is equivalent to the conductivity of water containing a
27、pproximately one part per million of sodium chloride. 8 Details of construction (see also Figure 1) 8.1 Stability. The cylinders shall stand vertically without rocking or spinning when placed on a level surface. They shall not topple when placed empty on a non-slip surface inclined at an angle of 12
28、 1 to the horizontal. 8.2 Base. The base shall be of a suitable plastics material, and may be integral with the body. It may be either polygonal with five or more equal sides, or circular. 8.3 Spout. The spout shall be so formed as to enable the contents of the cylinder to be poured out in a narrow
29、stream without spilling or running down the outside of the cylinder. Nominal capacity Smallest scale division Maximum permitted error Maximum ungraduated capacity at base mlmlmlml 10 25 50 100 250 500 1 000 2 000 0.2 0.5 1 1 2 5 10 20 0.2 0.5 1 1 2 5 10 20 1 2.5 5 10 20 50 100 200 Licensed Copy: she
30、ffieldun sheffieldun, na, Mon Dec 04 15:50:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5404-2:1977 2 BSI 11-1999 8.4 Dimensions 8.4.1 Cylinders shall comply with the dimensional requirements shown in Table 2. Table 2 Dimensions 8.4.2 The wall thickness shall be such that when tested for flexibi
31、lity in accordance with the procedure detailed in Appendix C, the diameter of the cylinder shall not decrease by more than 10 % and the change in indication arising from any permanent distortion caused by the test procedure shall not result in the maximum permitted error given in Table 1 being excee
32、ded. 8.5 Translucency. The cylinder shall be constructed in such a manner that when containing transparent liquids, the meniscus can be seen through the cylinder. 9 Graduation and figuring (see also Figure 2 and Figure 3) 9.1 Graduation lines. Graduation lines shall be clean, durable, uniform lines
33、of thickness not exceeding 0.3 mm for capacities up to and including 250 ml and not exceeding 0.5 mm for capacities of 500 ml and above. 9.2 Spacing of graduation lines. There shall be no evident irregularity in the spacing of the graduation lines. 9.3 Length of graduation lines 9.3.1 The length of
34、the short lines shall lie between 10 % and 12.5 % of the circumference of the cylinder. 9.3.2 The length of the medium lines (where used), shall lie between 15 % and 18 % of the circumference of the cylinder. 9.3.3 The length of the long lines shall be at least 20 % of the circumference of the cylin
35、der. 9.3.4 The medium and long lines should extend symmetrically at each end beyond the ends of the short lines. 9.4 Sequence of graduation lines 9.4.1 On cylinders of capacity 50 ml and 100 ml divided in 1 ml, and capacity 1 000 ml divided in 10 ml: a) every tenth graduation line shall be a long li
36、ne; b) there shall be a medium line between two consecutive long lines; c) there shall be four short lines between consecutive medium and long lines. 9.4.2 On cylinders of capacity 10 ml divided in 0.2 ml, capacity 250 ml divided in 2 ml, and capacity 2 000 ml divided in 20 ml: a) every fifth gradua
37、tion line shall be a long line; b) there shall be four short lines between two consecutive long lines. 9.4.3 On cylinders of capacity 25 ml divided in 0.5 ml, and capacity 500 ml divided in 5 ml: a) every tenth graduation line shall be a long line; b) there shall be four medium lines between two con
38、secutive long lines; c) there shall be one short line between two consecutive medium lines and between consecutive medium and long lines. 9.5 Position of graduation lines. The graduation lines shall lie in planes at right angles to the longitudinal axis of the cylinder and shall form a vertical scal
39、e on the cylinder on the side facing the viewer when the cylinder is positioned with the spout facing to the left. 9.6 Figuring of graduation lines. Graduation lines shall be figured as illustrated in Figure 2 and Figure 3, in accordance with the following principles. 9.6.1 On all cylinders other th
40、an 250 ml and 2 000 ml every long line shall be figured. 9.6.2 On a cylinder of 250 ml capacity, alternate long lines shall be figured from 20 to 240 with an additional Figure 250. On the cylinder of 2 000 ml capacity, alternate long lines shall be figured, but the figuring of all long lines is perm
41、itted. 9.6.3 The scheme of figuring shall be such that the figure representing the nominal capacity refers to the highest graduation line. 9.6.4 The figures shall either be placed slightly to the right of the end of the line to which they refer in such a way that an extension of the line would bisec
42、t them, or be placed immediately above the long lines to which they refer and slightly to the right of the adjacent shorter lines. Nominal capacity Internal height to highest graduation line Overall height Distance from highest graduation line to top of cylinder min.max.min. mlmmmmmm 10 25 50 100 25
43、0 500 1 000 2 000 90 90 115 145 200 250 315 400 150 170 200 260 340 390 470 570 40 40 50 60 60 75 75 75 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:50:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5404-2:1977 BSI 11-19993 If the long lines are extended so as almost to encircle the c
44、ylinder, the figures shall either be placed immediately above the line or there shall be a break in each long line, slightly to the right of the right-hand ends of the shorter lines, and the figures for that line shall occupy the break and be placed in such a manner that the line would bisect them.
45、10 Inscriptions The following inscriptions shall be durably and legibly marked on all cylinders. a) The symbol “cm3” or the symbol “ml” to indicate the unit of volume (see note to 3.1). b) The inscription “In 20 C” to indicate that the cylinder is graduated for content at 20 C. NOTEWhere, exceptiona
46、lly, the reference temperature is 27 C, this value should be substituted for 20 C. c) The makers and/or vendors name or readily identifiable mark. d) The name of the material (or its recognized abbreviation as given in BS 3502) from which the cylinder is made, e.g. “PP”. e) The number of this Britis
47、h Standard, i.e. BS 5404. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 15:50:17 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5404-2:1977 4 BSI 11-1999 Appendix A Calibration of plastics measuring cylinders A.1 Thoroughly clean and dry the measuring cylinder. Fill the clean weighed cylinde
48、r with distilled water to a few millimetres above the graduation mark to be tested, care being taken to avoid wetting the cylinder above the water surface. Ensure that the cylinder settles down to room temperature before testing, and determine the water temperature, t C. Adjust the lowest point of t
49、he water meniscus to the top edge of the graduation mark in question by withdrawing small amounts of water by means of a glass tube drawn out to a jet at its lower end. If the meniscus is curved, set it by one of the two methods detailed below. a) Set the meniscus so that the plane of the upper edge of the graduation line is horizontally tangential to the lowest point of the meniscus, the line of sight being in the same plane. b) Set the meniscus so that the plane of the centre of the graduation line is horizontally tange
链接地址:https://www.31doc.com/p-3773258.html