GB/T 31887.1-2019 (GB/T 31887-2015) PDF English
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Cycles -- Lighting and retro-reflective devices -- Part 1: Lighting and light signalling devices
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GB
NATIONAL STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.150
Y 14
GB/T 31887-2015 / ISO 6742-2:1985
Cycles - Retro-reflective devices
(ISO 6742-2:1985, Cycles - Lighting and retro-reflective
devices - Photometric and physical requirements - Part 2:
Retro-reflective devices, IDT)
ISSUED ON: SEPTEMBER 11, 2015
IMPLEMENTED ON: OCTOBER 1, 2016
Issued by: General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration Committee.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Symbols and units used ... 6
5 Photometric requirements ... 7
6 Colorimetric requirements ... 9
7 Physical requirements ... 10
8 Photometric test for reflectors ... 15
9 Photometric test for retro-reflective tyres ... 17
10 Colorimetric test ... 18
11 Marking ... 19
Foreword
Clause 5, Clause 6, Clause 7, 8.2, 8.3, 8.4, 8.5, 8.7, 8.8, 9.2, 9.3, 9.4, 9.5,
Clause 11 of this Standard are mandatory; the rest are recommendatory.
This Standard was drafted in accordance with the rules given in GB/T
1.1-2009.
This Standard uses translation method to identically adopt ISO 6742-2:1985
Cycles - Lighting and retro-reflective devices - Photometric and physical
requirements - Part 2: Retro-reflective devices.
This Standard made the following editorial modifications:
- modified the name of the standard to “Cycles - Retro-reflective devices”
in order to be consistent with existing standard series;
- in order to facilitate the use and more intuitively reflect the the technical
parameters of various color reflector optical requirements, according to
the provisions of 5.1 in ISO 6742-2:1985, ADDED yellow reflector light
intensity coefficient Table 2 and red reflector light intensity coefficient
Table 3 in 5.1 of this Standard, so it made a corresponding adjustment to
the subsequent table numbers (see Clause 5, Clause 6, Clause 7);
- “3.2” quoted in 7.2.2.9 of ISO 6742-2:1985 was a typo so this Standard
has corrected it to “5.2”.
The Chinese documents which have consistency with the international
normative reference in this Part are as follows:
- GB 3565-2005, Safety requirements for bicycles (ISO 4210:1996, IDT)
- GB/T 3977-2008, Specification of colors (CIE 15:2004, NEQ)
- GB/T 3978-2008, Standard illuminants and geometric conditions (CIE
15:2004, NEQ)
- GB/T 3979-2008, Methods for the measurement of object color (CIE
15:2004, NEQ)
Attention is drawn to the possibility that some of the elements of this Standard
may be the subject of patent rights. The issuing authority shall not be held
responsible for identifying any or all such patent rights.
This Standard was proposed by China Light Industry Federation.
Cycles - Retro-reflective devices
1 Scope
This Standard specifies photometric and physical requirements for
retro-reflective devices for fitting to cycles.
This Standard is applicable to retro-reflective devices intended to be used on
public roads and, in particular, for use on cycles made in compliance with ISO
4210.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including
any amendments) applies.
ISO 3768, Metallic coatings - Neutral salt spray test (NSS test)
ISO 4210, Cycles - Safety requirements of bicycles
IEC Publication No.50 (45), International Electrotechnical Vocabulary -
Lighting
CIE Publication No.15, Colorimetry: Official recommendations of the
International Commission on Illumination (CIE)
3 Terms and definitions
For the purposes of this document, the definitions given below, together with
those in IEC Publication No. 50(45) apply.
3.1 retro-reflective device; reflector
An assembly ready for use and comprising one or more retro-reflecting
optical units.
3.2 wide angle reflector
Device providing retro-reflection through horizontal entrance angles of not
less than 50° on either side of the reference axis.
the inflated tyre by abrasion with a wet, steel-bristle brush, tyre material will
be removed with the retro-reflective material.
7.2.2.6 Impact resistance
When tested by the following method the retro-reflective material shall show
no cracking or separation from the tyre outside a distance of half the width of
the material from the point of impact.
Condition the test sample for 1 hat -20±5°C. Immediately after 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 2 m.
7.2.2.6 Resistance to corrosion
After being tested by the method specified in ISO 3768 there shall be no
evidence of corrosion of the retro-reflective material that would result in failure
to meet 75% of the CIL values in table 5, at α = 0°12’ or 0°20’ and β = -4°.
The duration of the test shall be 50 h comprising two periods of exposure of
24 h each, separated by an interval of 2 h during which time the sample is
allowed to dry.
7.2.2.7 Resistance to fuel
Lightly rub the retro-reflective area of the test sample with a cotton cloth
soaked in a test fuel composed of 70% n-heptane and 30% toluene (by
volume).
After 5 min clean the retro-reflective area by washing in a detergent solution
and rinse in clean water.
7.2.2.8 Resistance to lubricating oil
Lightly rub the retro-reflective area of the test sample with a cotton cloth
soaked in a detergent lubricating oil. After 5 min 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.
7.2.2.9 Water test
Immerse the test sample for 1 min in water at a temperature of 23±5°C. 30 s
after removal measure the CIL value for α = 0°12’ or 0°20’ and β = -4°. The
CIL value shall not be less than 50% of the minimum value in 5.2.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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