© ISO 2015 Cycles — Lighting and retro reflective devices — Part 2 Retro reflective devices Cycles — Dispositifs d’éclairage et dispositifs rétroréfléchissants — Partie 2 Dispositifs rétroréfléchissan[.]
INTERNATIONAL STANDARD ISO 6742-2 Third edition 2015-05-15 Cycles — Lighting and retroreflective devices — Part 2: Retro-reflective devices Cycles — Dispositifs d’éclairage et dispositifs rétroréfléchissants — Partie 2: Dispositifs rétroréfléchissants Reference number ISO 6742-2:2015(E) © ISO 2015 ISO 6742-2:2015(E) COPYRIGHT PROTECTED DOCUMENT © ISO 2015, Published in Switzerland All rights reserved Unless otherwise specified, no part o f this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission Permission can be requested from either ISO at the address below or ISO’s member body in the country o f the requester ISO copyright o ffice Ch de Blandonnet • CP 401 CH-1214 Vernier, Geneva, Switzerland Tel +41 22 749 01 11 Fax +41 22 749 09 47 copyright@iso.org www.iso.org ii © ISO 2015 – All rights reserved ISO 6742-2:2015(E) Contents Page Foreword iv Scope Normative re ferences Terms and definitions General f Photometrical requirements Colorimetric requirements Physical requirements 7.1.1 Construction 7.1.2 Test methods 10 7.2.1 Form and location 10 7.2.2 Test methods 10 12 7.3.1 Construction 12 7.3.2 Test methods 12 Photometric test 13 8.1 General 13 8.1.1 Instrumentation arrangement 13 8.1.2 Source of illumination 14 8.1.3 Receiver 14 8.1.4 Observation distance 14 14 14 8.2.1 Principle 14 14 15 f f 15 15 8.3.1 Principle 15 8.3.2 Test method 15 15 f 15 8.4.2 Test method 16 Colorimetric test 16 9.1 Instrumental measurements 16 9.2 Visual comparison 17 9.3 Use of methods 17 10 Marking 17 Bibliography 18 Symb o ls and units us ed C hro no lo gical o rder o f tes ts (o nly Reflecto rs Retro - reflective tyres Retro - reflective s p o kes o r s p o ke cas es 7.1 Reflecto rs 7.2 Retro - reflective tyres 7.3 Retro - reflective s p o kes o r s p o ke cas es 8.2 Reflecto rs 8.1 o r reflecto rs ) I lluminance at the reflecto r 8.2 Reflecto r mo unt (o r s up p o rt) 8.2 Tes t area o 8.2 O rientatio n o reflecto r reflecto r 8.3 Retro - reflective tyres 8.4 Retro - reflective s p o kes o r s p o ke cas es Tes ting as s emb lies © ISO 2015 – All rights reserved o r retro - reflective s p o kes and s p o ke cas es iii ISO 6742-2:2015(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies) The work o f 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 International 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 o f electrotechnical standardization The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part In particular the different approval criteria needed for the di fferent types o f ISO documents should be noted This document was dra fted in accordance with the editorial rules of the ISO/IEC Directives, Part (see www.iso.org/directives) Attention is drawn to the possibility that some o f the elements o f this document may be the subject o f patent rights ISO shall not be held responsible for identi fying any or all such patent rights Details o f any patent rights identified during the development o f the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents) Any trade name used in this document is in formation given for the convenience o f users and does not constitute an endorsement For an explanation on the meaning o f ISO specific terms and expressions related to formity assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers to Trade (TBT), see the following URL: Foreword — Supplementary in formation The committee responsible for this document is ISO/TC 149, Cycles, SC 1, Cycles and major sub-assemblies This third edition cancels and replaces the second edition (ISO 6742-2:1985), which has been technically revised ISO 6742 consists of the following parts, under the general title Cycles — Lighting and retro-reflective devices: — Part 1: Lighting and light signalling devices — Part 2: Retro-reflective devices — Part 3: Installation and use of lighting and retro-reflective devices — Part 4: Lighting systems powered by the cycle’s movement — Part 5: Lighting systems not powered by the cycle’s movement iv © ISO 2015 – All rights reserved INTERNATIONAL STANDARD ISO 6742-2:2015(E) Cycles — Lighting and retro-reflective devices — Part 2: Retro-reflective devices Scope T h i s p ar t o f I S O 6742 i s appl ic able to re tro -refle c tive device s u s e d on c ycle s i ntende d to b e u s e d on publ ic ro ad s a nd, e s p e c i a l ly, bic ycle s complyi ng with I S O 42 10 and I S O T h i s p a r t o f I S O 6742 s p e ci fie s tome tric a nd phys ic a l re qu i rements o f re tro -refle c tive device s T he Normative re ferences fol lowi ng i nd i s p en s able c uments , i n whole or i n p ar t, a re normatively re ference d i n th i s c u ment and a re for its appl ic ation For date d re ference s , on ly the e d ition cite d appl ie s For u ndate d re ference s , the late s t e d ition o f the re ference d c u ment (i nclud i ng any amend ments) appl ie s ISO 9227, Corrosion tests in artificial atmospheres — Salt spray tests CIE 15, Colorimetry: official recommendations of the International Commission on Illumination CIE 1931, XYZ colour space of the International Commission on Illumination Terms and definitions For the pu r p o s e s o f th i s c ument, the fol lowi ng term s and defi n ition s apply 3.1 retro-reflective device; reflector as s embly re ady for u s e and compri s i ng one or more re tro -refle c ti ng op tic a l u nits 3.2 wide angle reflector device provid i ng re tro -refle c tion th rough hori z onta l entrance a ngle s o f no t le s s than ° on either s ide of the reference axis 3.3 conventional reflector device provid i ng re tro -refle c tion th rough entra nce angle s o f no t le s s tha n ° on either s ide o f the reference axis 3.4 high values reflector re d re tro -refle c tive device with h igh va lue s o f refle c tion e g de d ic ate d to b e mounte d on luggage c arrier 3.5 retro-reflective spoke s p oke with re tro -refle c tive s ur face 3.6 retro-reflective spoke case de vi c e , e g c yl i nde r, w i th re tro - re fle c ti ve s u r fac e w i th or w i tho u t a gap , p ro v i d i n g a s e c u re d mo u nti n g o n a s p o ke © ISO 2015 – All rights reserved ISO 6742-2:2015(E) 3.7 retro-reflective tyre tyre re ady for u s e and compri s i ng re tro -refle c ti ng a n nu l i mou lde d on to e ach s idewa l l o f the tyre General 4.1 Symbols and units used Symb ol s are s hown i n Figure Their meaning and units used are given in Table Figure — Symbols NO TE T he fo l lowi ng s ymb o l s a re i n accord a nce with Re gu l ation N o o f the U N/ E C E concer n i ng re tro - re fle c ti ve device s © ISO 2015 – All rights reserved ISO 6742-2:2015(E) Table — Meaning and units o f symbols used Symbol Α C NC Rr CR ØR Se CS ØS Dea D’e a D α β Meaning Area o f the e ffective reflex sur face o f the retro-reflective device Reference centre Reference axis Receiver, observer or measuring device Centre of receiver Diameter of receiver Rr, if circular Source of illumination Centre of source of illumination Diameter of source of illumination Distance from centre C S to centre C Distance from centre C R to centre C Mean diameter o f retro-reflective annulus on retro-reflective tyres Observation angle Entrance angle With respect to line C S C which always considered to be horizontal, this angle is prefixed with signs – (le ft), + (right), + (up) or – (down), according to the position of the source S e in relation to the axis NC, as seen when looking towards the retro-reflective device For any direction defined by two angles, verti - Unit cm — — — — cm — — cm m m mm Degree and minutes Degree and minutes cal and horizontal, the vertical angle is always given first d γ Angular subtense of measuring device Rr, as seen from point C Degree an minutes δ Angular subtense of the source S e, as seen from point C Degree and minutes ε E CIL Rotation angle This angle is positive when the rotation is clockwise as seen when looking towards the illuminated sur face I f reflecting device is marked “TOP”, the position thus indicated is taken as origin Illuminance o f retro-reflective device Coe fficient o f luminous intensity Degree and minutes lux millicandelas per lux D e and D’e are generally very nearly the same and under normal conditions o f observation it may be assumed that = D’e Furthermore, the effective distances may be used when a collimated system is used in order to obtain an artificially increased measuring distance a De 4.2 Chronological order o f tests (only for reflectors) The applicant shall submit for approval samples which shall be tested in the chronological order indicated in Table © ISO 2015 – All rights reserved ISO 6742-2:2015(E) Table — Chronological order o f tests Number o f paragraph 7.1.2.2 Clause Clause Clause 7.1.2.4 7.1.2.5 7.1.2.6 Clause Clause5 7.1.2.3 Clause Clause 5 Samples Tests for retro-reflective devices a Temperature resistance test X X X X Colorimetry: visual inspection Trichromatic coordinates in case of doubt Photometry only at V = H = ° Photometry at all test points Moisture resistance test Resistance to fuels Resistance to lubricating oils Colorimetry: visual inspection Trichromatic coordinates in case of doubt Photometry only at V = H = ° Impact test (only for wide angle reflector and conventional reflector of Group B) b c d e X X X X X X X X X X X X X X X X X X X X X X X X X X f X X Colorimetry: visual inspection X X X X Trichromatic coordinates in case of doubt Photometry only at V = H = ° Photometrical requirements In order to follow different requirements in different countries, the photometrical requirements are divided into groups: Group A and Group B Table — Tables link with groups Group A Table Table Table Table 10 Table 11 Table 13 Table 14 NOTE 5.1 Group B Table Table Table ― Table 12 ― ― Groups A or B have to be chosen according to national regulations Reflectors When tested by the method given in Clause , the CIL values for reflectors shall not be less than those specified in Tables 4, 5, 6, 7, 8, or 10 Tables to applies to front, side and rear reflectors Tables and applies to pedal reflectors Table 10 applies to high values reflectors High values reflectors are only applicable in Group A © ISO 2015 – All rights reserved ISO 6742-2:2015(E) Table — Coe fficients o f luminous intensity, CIL, for conventional reflectors Colour Observation angle α vertical V horizontal H °20′ White °30′ °20′ Yellow °30′ °20′ Red °30′ Entrance angle β (in degree) 0° ±10 ° 0° ±5 ° 0° 200 20 750 12,5 300 ±20 ° 800 11,2 500 200 2,8 400 10 250 6,25 100 2,5 Table — Coe fficients o f luminous intensity, CIL, for conventional reflectors Colour Observation angle α Entrance angle β (in degree) vertical V 0° ±10 ° 0° horizontal H 0° 0° ±20 ° °12′ White °30′ °12′ Yellow °30′ °12′ Red °30′ 500 26 560 21 625 650 18 030 15 410 850 11 530 10 210 Table — Coe fficients o f luminous intensity, CIL, for wide angle reflectors Colour White Yellow Red Observation angle α °20′ °30′ °20′ °30′ °20′ °30′ © ISO 2015 – All rights reserved Entrance angle β (in degree) vertical V 0° ±10 ° 0° 0° 0° 0° horizontal H 0° 0° ±20 ° ±30 ° ±40 ° ±50 ° 800 34 125 21 450 200 24 750 15 300 610 15 380 10 150 540 15 335 10 135 470 15 290 10 115 400 15 250 10 100 ISO 6742-2:2015(E) Table — Coe fficients o f luminous intensity, CIL, for wide angle reflectors Entrance angle β (in degree) Observation Colour angle α White vertical V ° ±10 ° ° ° ° ° horizontal H ° ° ±20 ° ±30 ° ±40 ° ±50 ° °1 ′ °3 ′ Yellow °1 ′ °3 ′ Red °1 ′ °3 ′ 500 26 560 21 625 650 18 030 15 410 850 11 530 10 210 750 11 465 10 185 650 11 405 10 160 550 11 340 10 135 Table — Coe fficients o f luminous intensity, CIL, for pedal reflectors Observation Colour angle α Yellow Entrance angle β (in degree) vertical V ° ±10 ° ±5 ° horizontal H ° ° ±20 ° °2 ′ °3 ′ 300 12 200 100 Table — Coe fficients o f luminous intensity, CIL, for pedal reflectors Colour Yellow Observation angle α Entrance angle β (in degree) vertical V ° ±10 ° ° horizontal H ° ° ±20 ° °1 ′ °3 ′ 450 16,5 350 11,5 175 7,5 Table 10 — Coe fficients o f luminous intensity, CIL, for high values reflectors Colour Red 5.2 Observation angle α °2 ′ °3 ′ Entrance angle β (in degree) vertical V ° ±10 ° ±5 ° horizontal H ° ° ±20 ° 000 30 700 20 400 10 Retro-reflective tyres Clause f Table 11 and Table 12 In case where D is less than 420 mm the minimum photometric value for each observation and entrance angle shall be equal to the value for D = 420 mm When te s te d b y the me tho d given i n , the C I L va lue s or a re tro -refle c tive tyre s l l no t b e le s s tho s e s p e c i fie d i n © ISO 2015 – All rights reserved ISO 6742-2:2015(E) Table 11 — Coe fficients o f luminous intensity, CIL, for retro-reflective tyres Colour Either White or White/Yellow Entrance angle β (in degree) Observation angle α 5° °20′ 1,60 D 20 ° 1,40 D 40 ° 0,47 D 50 ° 0,15 D °30′ 0,11 D 0,10 D 0,065 D 0,020 D horizontal H Table 12 — Coe fficients o f luminous intensity, CIL, for retro-reflective tyres Colour Either White or White/Yellow 5.3 Entrance angle β (in degree) Observation angle α °12′ −4 ° 1,21 D 20 ° 1,06 D 40 ° 0,70 D 50 ° 0,21 D °30′ 0,121 D 0,106 D 0,070 D 0,021 D horizontal H Retro-reflective spokes or spoke cases Retro-reflective spokes or spoke cases are only applicable in Group A When tested by the method given in Clause , the CIL values for retro-reflective spokes shall not be less than those specified in Table 13 Table 13 — Coe fficients o f luminous intensity, CIL, for retro-reflective spokes Colour White Observation angle α Entrance angle β (in degree) vertical V horizontal H °20′ °30′ 0° ±5 ° 500 90 0° ±10 ° 400 80 0° ±20 ° 300 70 0° ±30 ° 200 70 0° ±40 ° 000 60 0° ±50 ° 800 60 When tested by the method given in Clause , the CIL values for retro-reflective spoke cases shall not be less than those specified in Table 14 Table 14 — Coe fficients o f luminous intensity, CIL, for retro-reflective spoke cases Colour White Observation angle α Entrance angle β (in degree) vertical V horizontal H °20′ °30′ 0° ±5 ° 600 70 0° ±10 ° 450 60 0° ±20 ° 400 50 0° ±30 ° 250 50 0° ±40 ° 220 40 0° ±50 ° 90 12 The colour o f the retro-reflecting light is to be determined according to Clause and has to be within the colour range white of this part of ISO 6742 Retro-reflective spokes or spoke cases which have been coloured with a coat o f paint are inadmissible © ISO 2015 – All rights reserved ISO 6742-2:2015(E) Colorimetric requirements When de term i ne d b y the me tho d given i n Clause , the colour o f the refle c te d l ight sh a l l b e lo c ate d with i n the appropriate a re a defi ne d b y C I E ch romaticity co ord i nate s s p e ci fie d i n Fo r e a s e o f re ference the s e a re a s a re s hown graph ic a l l y i n NO TE Figure Table 15 Table 15 — x-y chromaticity coordinates o f the intersection points o f colour boundary lines Colour Red Yellow White a White/Yellowa x y x y x y x y 0,665 0,335 0,547 0,452 0,300 0,342 0,380 0,408 0,645 0,335 0,536 0,444 0,440 0,432 0,509 0,490 Coordinates 0,721 0,259 0,613 0,387 0,500 0,440 0,618 0,382 0,735 0,265 0,593 0,387 0,500 0,382 0,440 0,382 0,440 0,382 0,380 0,337 0,300 0,276 Fo r re tro -re fle c ti ve t yre s o n l y Key W white light region Y R red light region W/Y S spectrum locus yello w light regio n white/yellow light regio n Figure — Boundaries o f colour areas for reflective devices © ISO 2015 – All rights reserved ISO 6742-2:2015(E) Physical requirements 7.1 Reflectors 7.1.1 Construction The reflector and/or mount shall incorporate a distinct pre ferred assembly method to ensure that the reflector can be mounted in its designed orientation with regard to the bicycle 7.1.2 7.1.2.1 Test methods General A reflector shall comply with the photometric and colorimetric requirements o f 5.1 and Clause 6, and there shall be no loosening of the mounting(s) or distortion of the housing that would affect the per formance o f the reflector, a fter being subjected to any or all tests specified in 7.1.2.2 to 7.1.2.6 7.1.2.2 Temperature resistance test When tested by the following method, a reflector shall exhibit no so ftening, cracks, distortion or luster change o f the lens or other visible de fects that a ffect the reflecting function: a) For Group A ( ) Place the reflector in a pre-heated oven for a period o f 48 h at a temperature o f 65 ± °C; b) For Group B ( ) Place the reflector in a pre-heated oven for a period o f h at a temperature o f 50 + 50 °C NOTE A pedal reflector may be tested integrally with its pedal 7.1.2.3 Impact test (except for conventional reflector o f Group A) When a reflector is tested at room temperature by the following method the lens shall not crack Mount the reflector in a manner similar to the way in which it is mounted on the bicycle, but with the lens face horizontal and directed upwards Drop a 13 mm diameter polished solid steel ball, once, vertically onto the central part o f the lens from a height o f 0,76 m The ball may be guided but not restricted in free fall 7.1.2.4 Moisture resistance test Strip all removable parts from the reflective device, whether part o f a lamp or not, and immerse for 10 in water at a temperature o f (50 ± 5) °C, the highest point o f the upper part o f the reflective sur face being 20 mm below the sur face o f the water Repeat this test a fter turning the reflective device through 180 ° so that the reflective sur face is at the bottom and rear face is covered by about 20 mm o f water Then immediately immerse the optical unit in the same procedure in water with a temperature o f (25 ± 5) °C 7.1.2.5 Resistance to fuels Soak the outer sur face o f the reflector on a mixture o f 70 % o f n-heptane and 30 % o f toluene (by volume) A fter min, clean the sur face by wiping with a cloth © ISO 2015 – All rights reserved ISO 6742-2:2015(E) 7.1.2.6 Resistance to lubricating oils Wipe the outer sur face o f the reflex reflector lightly with cotton soaked in detergent lubricating oil A fter min, clean the sur face by wiping with a cloth 7.2 Retro-reflective tyres 7.2.1 Form and location The retro-reflective strip shall be in form o f a continuous circle o f retro-reflective material on each sidewall o f the tyre 7.2.2 7.2.2.1 Test methods General When subject to the test in 7.2.2.2 to 7.2.2.8 inclusive, the retro-reflective material on the tyre shall comply with the photometric requirements o f 5.2: — for α = °20′ and β = 5° for group A, or — for α = °12′ and β = −4° for group B, and with the colorimetric requirements of Clause as specified in Table 15 The table also indicates where a portion o f a tyre shall be used instead o f a complete tyre The portion shall be cut from a tyre not previously subjected to physical stress o f this part o f ISO 6742 The requirements of 5.2 and Clause not apply to a portion cut from a tyre Table 16 — Applicability o f specimens to the photometric and colorimetric requirements Test in clause 7.2.2.2 7.2.2.3 7.2.2.4 7.2.2.5 7.2.2.6 7.2.2.7 7.2.2.8 7.2.2.2 Tyre or portion to be used Tyre Portion Tyre Tyre Portion Portion Tyre Photometric requirements apply Yes as in Table 11 and Table 12 No Yes as in Table 11 and Table 12 Yes as in Table 11 and Table 12 No No Yes, see 7.2.2.8 Colourimetric requirements apply Yes No Yes Yes No No Yes Temperature resistance When tested by the following method, there shall be no cracking, peeling or blistering o f the retroreflective material that would a ffect the per formance for the intended use Subject a test sample to the following conditions in sequence: a) 12 h consecutively at a temperature o f (65 ± 5) °C with a relative humidity o f (10 ± 5) %; b) at least h at a temperature o f (23 ± 5) °C with a relative humidity o f (50 ± 5) %; c) 15 h consecutively at a temperature o f (−20 ± 5) °C 10 © ISO 2015 – All rights reserved ISO 6742-2:2015(E) 7.2.2.3 Impact resistance When tested with the following method the retro-reflective material shall show no cracking or separation from the tyre outside a distance o f hal f the width o f the material from the point o f impact Condition the test sample for h at a temperature o f (−20 ± 5) °C Immediately a fter removal from the cold storage, place the sample on a solid support base and subject the retro-reflective area to an impact from a 25 mm diameter solid steel ball dropped from a height of m 7.2.2.4 Resistance to fuels Lightly rub the retro-reflective area o f the test sample with a cotton cloth soaked in a test fuel composed o f 70 % o f n -heptane and 30 % o f toluene (by volume) A fter clean the retro-reflective area by washing a detergent solution and rinsing in clean water 7.2.2.5 Resistance to lubricating oils Lightly rub the retro-reflective area o f the test sample with a cotton cloth soaked in detergent lubricating oil A fter wipe the area clean with a mild aliphatic solvent such as heptane and follow by washing with a neutral detergent and rinsing in clean water 7.2.2.6 Adhesion The retro-reflective material shall adhere to the tyre in such a way that, when conditioned and tested as described, a greater force than that specified shall be required to remove it from the substrate, or the material shall break when an attempt is made to remove it Condition the test sample for 30 at a temperature o f (50 ± 5) °C and then for 30 at a temperature o f (23 ± 5) °C With a sharp kni fe, separate a strip o f the retro-reflective material from the tyre Apply a tensile force o f N per millimetre o f width o f the strip in a direction normal to the strip to attempt to separate it from the substrate 7.2.2.7 Abrasion resistance The retro-reflective material shall be as resistant to abrasion as is the adjacent tyre material so that retro-reflective material is removed from the inflated tyre by abrasion with wet, steel-bristle brush, tyre material will be removed with the retro-reflective material 7.2.2.8 Water test Immerse the test sample for in water with a temperature o f (23 ± 5) °C Measure the CIL value 30 s after removal: — for α = °20′ and β = ° for group A, or — for α = °12′ and β = −4 ° for group B The CIL value shall not be less than 50 % o f the minimum value in 5.2 © ISO 2015 – All rights reserved 11 ISO 6742-2:2015(E) 7.3 Retro-reflective spokes or spoke cases 7.3.1 Construction The retro-reflective spokes or spoke cases and/or mount shall incorporate a distinct pre ferred assembly method to ensure that the retro-reflective spokes or spoke cases can be mounted in its designed orientation with regard to the bicycle 7.3.2 7.3.2.1 Test methods General A retro-reflective spokes or spoke cases shall comply with the photometric and colorimetric requirements of 5.3 and Clause 6, and there shall be no loosening of the mounting(s) or distortion that would affect the per formance o f the retro-reflective spokes or spoke cases, a fter being subjected to any or all tests specified in 7.3.2.2 to 7.3.2.5 When subject to the test in 7.3.2.2 to 7.3.2.5 inclusive, retro-reflective spokes or spoke cases shall comply with the photometric requirements o f 5.3 for α = ° 20′ and β = ± °, and with the colorimetric requirements of Clause as specified in Table 15 7.3.2.2 Temperature resistance When tested by the following method, there shall be no cracking, peeling or blistering o f the retroreflective material that would a ffect the per formance for the intended use: Subject a test sample to the following conditions in sequence: a) 12 h consecutively at a temperature o f (65 ± 5) °C with a relative humidity o f (10 ± 5) %; b) at least h at a temperature o f (23 ± 5) °C with a relative humidity o f (50 ± 5) %; c) 15 h consecutively at a temperature o f (−20 ± 5) °C 7.3.2.3 Resistance to fuels Lightly rub the retro-reflective area o f the test sample with a cotton cloth soaked in a test fuel composed o f 70 % o f n -heptane and 30 % o f toluene (by volume) A fter clean the retro-reflective area by washing a detergent solution and rinsing in clean water 7.3.2.4 Resistance to lubricating oils Lightly rub the retro-reflective area of the test sample with a cotton cloth soaked in detergent lubricating oil A fter wipe the area clean with a mild aliphatic solvent such as heptane and follow by washing with a neutral detergent and rinsing in clean water 7.3.2.5 Resistance to corrosion A fter being tested by the method specified in ISO 9227 the retro-reflective spokes or spoke cases shall not exhibit any visible signs o f corrosion liable to a ffect the integrity o f the mounting or housing The duration o f the test shall be 50 h comprising two periods o f exposure o f 24 h each, separated by an interval o f h during which the sample is allowed to dry 12 © ISO 2015 – All rights reserved ISO 6742-2:2015(E) Photometric test 8.1 General 8.1.1 Instrumentation arrangement For refle c tors , for me as u ri ng refle c tive device s the genera l a rrangement o f the i n s tr umentation sh a l l be as shown in Figure , with the re ceiver p o s itione d ver tic a l ly ab ove the l ight s ou rce However, for me as u ri ng the tome tric p er forma nce o f the refle c tive device s with m icro s phere s the re ceiver c an a lternatively b e p o s itione d a longs ide the s ou rce i n the s ame hori zonta l plane Key retro - reflective device source receiver retro - reflecto r centre source aperture receiver aperture entrance plane observation plane right 10 11 12 13 14 15 16 17 left positive or up negative or down incident line observation line observation distance entrance angle observation angle Figure — Retro-reflector test instrumentation arrangement © ISO 2015 – All rights reserved 13 ISO 6742-2:2015(E) For re tro -refle c tive tyre s and re tro -refle c ti ve s p oke s or s p oke c as e s , the re ceiver may b e p o s itione d alongside the source in the same horizontal plane 8.1.2 Source o f illumination The source of illumination shall approximate to Illuminant A shall be stable a s defi ne d by C I E publ ic ation No , a nd For refle c tors , the shap e and s i z e o f the ap er tu re sh a l l b e s ele c te d i n relation to the re ceiver ap er tu re, the observation distance and the range of the device to be tested The angular aperture of the source s e en from the re ference centre o f the refle c tor sh a l l b e 10 ’ ma xi mu m For re tro -refle c tive tyre s a nd re tro -refle c tive s p oke s or s p oke c a s e s , the e ffe c ti ve len s d ia me ter s l l not exceed De / 500, where De 8.1.3 i s the d i s tance from the s ou rce to the refle c tor Receiver The receiver shall have the relative spectral response of CIE 1931 For refle c tors , the angu l ar ap er ture o f the re ceiver s e en be 10’ maximum from the re ference centre o f the refle c tor s l l For re tro -refle c tive tyre s a nd re tro -refle c tive s p oke s or s p oke ca s e s , the d i men s ion s o f the ac tive are a of the receiver shall be such that no point on the perimeter of the receiver is more than De / 000 from its centre, where De f i s the d i s tance 8.1.4 rom the s ource to the refle c tor Observation distance For refle c tors , the ob s er vation d i s ta nce sh a l l b e 10 m m i n i mu m, or the op tic a l e qu iva lent For retro -reflective tyres and retro -reflective spokes or spoke cases, the dis tance between the source and the centre of the wheel, and between the receiver and the centre of the wheel, shall each be not less than 10 m 8.1.5 Illuminance at the reflector For refle c tors , i l lu mi na nce at the refle c tor s l l b e u n i form with i n % o f the me an o f the comple te are a o f the refle c tor For re tro -refle c tive tyre s , me a s ure the i l lu m i nance i nc ident on the re tro -refle c tive s trip at u n i form i nter va l s o f no more th an 45 ° around the whe el with the re ceiver i n the d i re c tion o f i nc ident rad i ation T he average o f s uch re ad i ng wi l l b e the me an i l lu m i na nce o f the s ample I f any one o f s uch re ad i ng d i ffers b y more than 10 % from the me a n i l lu m i na nce, then a more u n i form s ou rce sh a l l b e ob ta i ne d For re tro -refle c tive s p okes or s p oke c a s e s , a s ource o f l ight i s re qu i re d wh ich re s u lts i n a n even ly i l lu m i nate d s ur face o f a s u ffic ient s i ze to c ap tu re the enti re d i ame ter o f the me as u rement a s s embly 8.2 8.2.1 Reflectors Principle T he coe fficient o f luminous intens ity, C I L , is determined by the meas urement o f the i lluminance at tes t piece and the luminous intens ity in the direc tion cons idered by means o f appropriately calibrated photometers 8.2.2 Reflector mount (or support) T he refle c tor under te s t s l l b e mou nte d on a gon io -me ter, or o ther s u itable s upp or t, to provide the required entrance angles 14 © ISO 2015 – All rights reserved ISO 6742-2:2015(E) T he re tro -refle c tor s upp or t s l l b e s uch th at the hori z onta l entrance angle are ob tai ne d b y ro tati ng the refle c tor a rou nd a mobi le ver tic a l a xi s; ver tic a l a ngle s by ro tati ng arou nd a fi xe d hori z onta l a xi s T he centre o f the reflex are a sha l l b e lo c ate d at the centre o f ro tation, and sha l l l ie on the a xi s p a s s i ng through the centre of the light source when β = 0/0 8.2.3 Test area o f reflector For tome tric meas urements , the ma xi mum are a o f the refle c tor to b e exp o s ed and proj e c ted on a pla ne perpendicular to its reference axis shall be 100 cm2 contained within a circle of diameter of 200 mm 8.2.4 Orientation o f reflector Refle c tors sha l l b e tes te d i n the orientation i n wh ich they are de s igne d to b e u s e d Sp oke refle c tors s l l b e te s te d i n the s i ngle orientation th at provide s the b es t overa l l p er formance S hould uncoloured reflections from the front s ur face inter fere with the photometric readings at any tes t point, the reflec tor may b e rotated around its vertical or hori zontal a xis through an angle not exceeding ° 8.3 8.3.1 Retro-reflective tyres Principle T he co e fficient o f luminous intens ity, C I L , is determined by the meas urement o f the i lluminance at tes t piece and the luminous intens ity in the direc tion cons idered by means o f appropriately calibrated photometers 8.3.2 Test method For te s ti ng the re tro -refle c tive materia l on a tyre, the tyre sha l l b e mounte d on a whe el and i n flate d to the ma xi mu m pres s u re re com mende d b y the manu fac tu rer T he re tro -refle c tive materi a l on e ach s ide o f the tyre sh a l l b e te s te d Me a s u re the i l lu m i na nce o f the re ceiver due to re tro -refle c tion given in Table 11 or Table 12 for the entra nce and ob s er vation angle s re s p e c tively NOTE A positive entrance angle corresponds to the case in which the line of sight to the receiver lies between f f the case in which the line of incidence lies between the line of sight of the receiver and the optic axis of the retrothe l i ne o i nc idence a nd the o p tic a xi s o the re tro -re fle c tive s tr ip , a nd a ne gative entra nce a n gle cor re s p ond s to re fle c ti ve s trip 8.4 8.4.1 Retro-reflective spokes or spoke cases Testing assemblies for retro-reflective spokes and spoke cases M i n i mu m re tro -refle c tive item s i n mcd/ l x measuring procedure according to 8.4.2 Figure for re tro -refle c tive s p oke s or s p oke c a s e s me as u re d with the i l lu s trate s a typic a l te s ti ng a s s embly © ISO 2015 – All rights reserved 15 ISO 6742-2:2015(E) Key D d 200 mm (50 − 10 ) mm Figure — Typical testing assembly 8.4.2 Test method When meas uri ng, only the p ar t o f the s ur face o f light emis s ion is to b e used which i s in the ins ide o f a ci rcle with a diameter o f mm whereas the s ur face which i s to b e apprais ed has to b e res tric ted i n a way that the apprais ed length o f the retro -reflec ting s ur face i s no t larger than mm p er s p oke or s p oke cas e For all photometric measurements the reference axis is the axle, i.e the normal alignment of the me a s urement as s embly i s to b e a l igne d i n d i re c tion o f the re ference a xi s T he s p oke ca s e s are to b e a l igne d i n the me a s u rement as s embly i n a way that the op en i ngs are on whe el level a nd the op en i ngs face each other pairwise I n c as e o f re tro -refle c tive s p okes the me as u rement s e tup c a n a l s o b e u s e d i n a s u itable form for re tro - refle c tive materi a l s on tyre s , ri ms and ri ngs woven i nto whe el s To en s u re a me a s urement i ndep endent from the random a l ign ment, the me a s urement as s embly s to b e ro tate d i n a n appropri ate velo city s o that the tome tric me as u ri ng device s uppl ie s a s tabi l i z e d d i s pl ay For exa mple 10 km/ h T he colour o f the re tro -refle c ti ng l ight i s to b e de term i ne d accord i ng to colour range white of this part of ISO 6742 Clause and has to be within the Colorimetric test 9.1 Instrumental measurements T he ch romatic ity co ord i nate s sh a l l b e de term i ne d for the cond ition α= ° ′, β= ° b y me a n s o f a A Sound calibration procedures and precaution shall be observed In particular, if a colourimeter is used s p e c trome ter or colou ri me ter T he tes t s p e ci men s l l b e i l lum i nate d b y a s ou rce o f C I E I l lum i nant it s l l b e ca l ibrate d with s tandard colou r s ou rce s who s e s p e c tra l charac teri s tics are clo s ely relate d to tho s e o f the te s t s ample s I f s tandard colou r s u r face s havi ng glo s s y or re tro -refle c tive s u r face s are u s e d, they s l l have b e en c a l ibrate d with the s ame i n s tru ment ge ome tr y 16 © ISO 2015 – All rights reserved