1、BRITISH STANDARDBS EN ISO 13468-2:2006Incorporating Amendment No. 1 (renumbers BS ISO 13468-2:1999 as BS EN ISO 13468-2:2006)Plastics Determination of the total luminous transmittance of transparent materials Part 2: Double-beam instrumentThe European Standard EN ISO 13468-2:2006 has the status of a
2、 British StandardICS 83.080.01g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN ISO 13468-2:2006This British Standard, having been prepared unde
3、r the direction of the Sector Committee for Materials and Chemicals, was published under the authority of the Standards Committee and comes into effect on 15 August 1999 BSI 2006ISBN 0 580 32872 4National forewordThis British Standard is the official English language version of EN ISO 13468-2:2006.
4、It is identical with ISO 13468-2:1999.The UK participation in its preparation was entrusted to Technical Committee PRI/21, Testing of plastics, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe Briti
5、sh Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Onli
6、ne.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsibl
7、e international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, pages i
8、 and ii, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to iv, pages 1 to 4, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date Comments1
9、6335 31 July 2006 Renumbers BS ISO 13468-2:1999 as BS EN ISO 13468-2:2006EN ISO 13468-2:2006 BSI 2006 iContentsPageNational foreword Inside front coverForeword iiiText of ISO 13468-2 1iiblankEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 13468-2April 2006ICS 83.080.01English VersionPlastics -
10、 Determination of the total luminous transmittance oftransparent materials - Part 2: Double-beam instrument (ISO13468-2:1999)Plastiques - Dtermination du facteur de transmission duflux lumineux total des matriaux transparents - Partie 2:Instrument double faisceau (ISO 13468-2:1999)Kunststoffe - Best
11、immung des totalenLichttransmissionsgrades von transparenten Materialien -Teil 2: Zweistrahlinstrument (ISO 13468-2:1999)This European Standard was approved by CEN on 16 March 2006.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving thi
12、s EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (Engl
13、ish, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech
14、 Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN D
15、E NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 13468-2:2006: EForeword The text of ISO 13468-2:1999 has been prepared by Te
16、chnical Committee ISO/TC 61 “Plastics” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 13468-2:2006 by Technical Committee CEN/TC 249 “Plastics“, the secretariat of which is held by IBN. This European Standard shall be given the status of a national stan
17、dard, either by publication of an identical text or by endorsement, at the latest by October 2006, and conflicting national standards shall be withdrawn at the latest by October 2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries a
18、re bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switz
19、erland and United Kingdom. Endorsement notice The text of ISO 13468-2:1999 has been approved by CEN as EN ISO 13468-2:2006 without any modifications. EN ISO 13468-2:2006EN ISO 13468-2:2006ii BSI 2006ContentsPageForeword iii1Scope 12 Normative references 13 Terms and definitions 14 Apparatus 15 Test
20、specimens 36 Conditioning 37 Procedure 38 Expression of results 49Precision 410 Test report 4Figure 1 Schematic arrangement of the integrating sphere 2Table 1 Measurements 3EN ISO 13468-2:2006 BSI 2006 iiiForewordISO (the International Organization for Standardization) is a worldwide federation of n
21、ational standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. Inter
22、national organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.International Standards are drafted in accordance with the
23、rules given in the ISO/IEC Directives, Part 3.Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.International Standard ISO 1
24、3468-2 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-chemical properties.ISO 13468 consists of the following parts, under the general title Plastics Determination of the total luminous transmittance of transparent materials: Part 1: Single-beam instrument; Part
25、 2: Double-beam instrument.ivblankEN ISO 13468-2:2006 BSI 2006 11 ScopeThis part of ISO 13468 covers the determination of the total luminous transmittance, in the visible region of the spectrum, of planar transparent and substantially colourless plastics, using a double-beam scanning spectro-photome
26、ter. This part of ISO 13468 cannot be used for plastics which contain fluorescent materials.This part of ISO 13468 is applicable to transparent moulding materials, films and sheets not exceeding 10 mm in thickness.NOTE 1 Total luminous transmittance can also be determined by a single-beam instrument
27、 as in part 1 of this International Standard.NOTE 2 Substantially colourless plastics include those which are faintly tinted.NOTE 3 Specimens more than 10 mm thick may be measured provided the instrument can accommodate them, but the results may not be comparable with those obtained using specimens
28、less than 10 mm thick.2 Normative referencesThe following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 13468. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, p
29、arties to agreements based on this part of ISO 13468 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintai
30、n registers of currently valid International Standards.ISO 291:1997, Plastics Standard atmospheres for conditioning and testing. ISO 5725-1:1994, Accuracy (trueness and precision) of measurement methods and results Part 1: General principles and definitions. ISO 5725-2:1994, Accuracy (trueness and p
31、recision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method. ISO 5725-3:1994, Accuracy (trueness and precision) of measurement methods and results Part 3: Intermediate measures of the precision of a sta
32、ndard measurement method. ISO/CIE 10526:1999, CIE standard illuminants for colorimetry. ISO/CIE 10527:1991, CIE standard colorimetric observers. CIE Publication No. 15.2:1986, Colorimetry. CIE Publication No. 17.4:1987, International lighting vocabulary also published as IEC 50(845):1987, Internatio
33、nal electrotechnical vocabulary Chapter 845: Lighting. 3 Terms and definitionsFor the purposes of this part of ISO 13468, the terms and definitions given in CIE Publication No. 17.4 for “transparent medium”, “transmittance”, “regular transmittance”, “radiant flux” and “luminous flux” apply, together
34、 with the following:3.1 transparent plasticsplastics in which the transmission of light is essentially regular and which have a high transmittance in the visible region of the spectrumNOTE Provided their geometrical shape is suitable, objects will be seen distinctly through plastic which is transpar
35、ent in the visible region.3.2 total spectral transmittancethe ratio of the transmitted radiant flux (regular and diffuse) to the incident radiant flux when a parallel beam of monochromatic radiation of a given wavelength passes through a specimen3.3 total luminous transmittancethe ratio of the trans
36、mitted luminous flux to the incident luminous flux when a parallel beam of light passes through a specimen4 Apparatus4.1 The apparatus shall consist of the following elements: a stabilized light source; a monochromator; an optical system that forms two parallel beams of monochromatic radiation of eq
37、ual wavelength and approximately equal radiant flux from the output of the monochromator (called the sample and the reference beam); and an integrating sphere fitted with ports and a photodetector.The sample beam enters the sphere through the entrance port. The reference beam enters the sphere throu
38、gh the reference port. The photodetector is mounted on the photodetector port in a manner that allows it to view with equal efficiency all parts of the sphere. Ingress of external light into the integrating sphere shall be prevented. A schematic arrangement of the integrating sphere is shown in Figu
39、re 1.EN ISO 13468-2:20062 BSI 20064.2 The value of the total luminous transmittance determined by the instrument shall be accurate to 1,0 %. To fulfill this requirement, the response of the photodetector must be sufficiently linear in the visible region of the spectrum and the spectral bandwidth at
40、half power of the monochromator must be sufficiently small. The measurement conditions shall be such that the specimen temperature does not increase while measurements are made.4.3 The optical system shall produce two parallel beams; the angle which any ray of either of these beams makes with the ax
41、is of the beam shall not exceed 0,087 rad (5). The beams shall not be vignetted at either port of the sphere.The diameter of each beam shall be 0,5 to 0,8 times the diameter of its respective port.4.4 Using this instrument, the repeatability standard deviation shall be 0,2 % or less. The within-labo
42、ratory reproducibility over long time intervals shall not exceed the repeatability by a factor of more than 3.4.5 The design of the instrument shall be such that the total spectral transmittance is zero when the radiant flux incident on the specimen is zero.4.6 The integrating sphere may be of any d
43、iameter as long as the total port area does not exceed 3,0 % of the internal area of the sphere.NOTE 1 It is recommended that the diameter of the integrating sphere is not less than 150 mm so that specimens of a reasonable size can be used.NOTE 2 When the diameter of the integrating sphere is 150 mm
44、 and the diameters of the entrance, reference and photodetector ports are 30 mm, the ratio of the total port area to the internal area of the sphere is 3,0 %.4.7 The entrance and reference ports of the integrating sphere shall be circular and of the same size (see the note below). The angle between
45、the straight line defined by the centre of the entrance port and the centre of the sphere and the straight line defined by the centre of the reference port and the centre of the sphere shall be less than or equal to 90. The angle between each of these straight lines and the straight line defined by
46、the centre of the photodetector port and the centre of the sphere shall be 90.NOTE The entrance and reference ports may have other shapes provided they give the same total luminous transmittance values.a) Side view b) Top viewFigure 1 Schematic arrangement of the integrating sphere (baffles not show
47、n)EN ISO 13468-2:2006 BSI 2006 34.8 The photodetector shall be fitted with baffles to prevent light falling on it directly from the specimen. It shall also be shielded from light reflected from the internal surface of the sphere.4.9 The surfaces of the interior of the integrating sphere and the baff
48、les shall be of substantially equal luminous reflectance which, determined in accordance to ISO 7724-2, shall be 90 % or more and shall not vary by more than 3 %. When direct measurement of the reflectance of the internal surface of an integrating sphere is difficult, the measurement may be carried
49、out instead on a surface prepared from the same material in the same way as the internal surface.4.10 The apparatus shall be contained in a light-tight box. No radiant flux other than the sample and reference beams may enter the sphere.4.11 The specimen holder shall be such as to hold the specimen rigidly in a plane normal 2 to the sample beam and as close as possible to the entrance port of the integrating sphere to ensure that all light which passes through the specimen, including scattered light, is collected.The holder shall be
