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GB 39552.1-2020 English PDF (GB39552.1-2020)

GB 39552.1-2020 English PDF (GB39552.1-2020)

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GB 39552.1-2020: Sunglasses and sunglare filters -- Part 1: General requirements

This Part of GB/T 39552 specifies classification, requirements, test sample selection, marks and packaging for plain sunglasses and sunglare filters. This Part is applicable to general purpose (for example, road use and driving) sunglasses, sunglare filters, sunglasses clips and lens sets. Refer to this Part for the transmittance requirements of prescription corrective sunglasses and sunglare filters.
GB 39552.1-2020
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 11.040.70
Y 89
Sunglasses and sunglare filters - Part 1: General
requirements
(ISO 12312-1:2013, Eye and face protection - Sunglasses and related
eyewear - Part 1: Sunglasses for general use, MOD)
ISSUED ON: NOVEMBER 17, 2020
IMPLEMENTED ON: DECEMBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 6
4 Structure and material ... 6
5 Transmittance ... 7
6 Optical properties ... 11
7 Fatigue strength of sunglasses ... 12
8 Nose bridge deformation and lens holding force ... 13
9 Resistance to light radiation ... 13
10 Flame retardant ... 14
11 Coating performance ... 14
12 Dimensions of sunglare filters ... 15
13 Impact resistance ... 15
14 Wear resistance ... 15
15 Nickel precipitation ... 16
16 Selection of test sample ... 16
17 Marks, packaging, transportation and storage ... 18
Annex A (informative) List of comparison on chapter number between this Part and ISO 12312-1:2013 ... 21
Annex B (informative) Instructions for use for sunglare filters ... 22 Sunglasses and sunglare filters - Part 1: General
requirements
1 Scope
This Part of GB/T 39552 specifies classification, requirements, test sample selection, marks and packaging for plain sunglasses and sunglare filters. This Part is applicable to general purpose (for example, road use and driving) sunglasses, sunglare filters, sunglasses clips and lens sets. Refer to this Part for the transmittance requirements of prescription corrective sunglasses and sunglare filters.
This Part does not apply to filters that protect against artificial light sources (such as light sources used in solariums) and goggles for industrial use. It is also not applicable to special filters that can directly observe the sun (such as observing solar eclipses).
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.
GB 10810.1, Uncut finished spectacle lenses - Part 1: Single-vision and multifocal lenses (GB 10810.1-2005, ISO 8980-1:2004, MOD)
GB 10810.5, Uncut finished spectacle lenses - Part 5: Requirements of
abrasion-resistant for spectacle lens surfaces (GB 10810.5-2012, ISO 8980- 5:2005, MOD)
GB/T 14214-2019, Spectacle frames - General requirements and test
methods (ISO 12870:2016, MOD)
GB/T 26397, Ophthalmic optics - Terminology (GB/T 26397-2011,
ISO13666:1998, MOD)
GB/T 39552.2-2020, Sunglasses and sunglare filters - Part 2: Test methods (ISO 12311:2013, NEQ)
ISO 12311:2013, Personal protective equipment - Test method for sunglass and related eyewear
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 26397 as well as the followings apply.
3.1 lens fractured
When the lens has one of the following conditions, it is called lens fractured: a) The lens splits into two or more pieces;
b) Fragments are coming off the near-eye surface of the lens;
c) The lens is directly penetrated.
3.2 decentred sunglasses
Sunglasses designed to eliminate the prism effect caused by the base curve of the filter.
4 Structure and material
4.1 Structure
The parts of sunglasses (including frames and filters) that are in contact with the wearer's skin should be smooth. There shall be no protrusions (or bumps) that may harm the human body.
4.2 Material and surface quality of filters
Take the reference point as the center. Within the area with a diameter of 30mm (excluding the width of 5mm from the edge of the filter), there shall be no defects on the surface or inside of the filter that may be harmful to vision. Outside this identification area, isolated, tiny internal or surface defects are allowed. 4.3 Physiological compatibility
The design and production of sunglasses shall follow the principle of not endangering the health and safety of the wearer during normal use.
Manufacturers shall minimize the release of harmful substances from parts that have long-term skin contact and meet the requirements of existing regulations. Special attention must be paid to avoid using substances that may cause allergies, carcinogens, induce organism mutations or toxic substances.
- Blue ???0.60;
- Green ???0.60.
5.3.4 Sunglasses used for driving at dawn, dusk and evening shall meet: a) The light transmittance shall not be less than 75%;
b) After the photochromic filter is tested under the conditions specified in 6.12 of GB/T 39552.2-2020, its light transmittance shall not be less than 75%. 5.4 Scattered light
The haze value of scattered light shall not be greater than 3%. The inspection shall be carried out according to the method specified in 6.10 of GB/T 39552.2- 2020.
NOTE: This article does not apply to prescription corrective sunglasses and sunglare filters. 5.5 Special transmittance requirements
5.5.1 Photochromic filters
The ratio between the light transmittance (0) of the photochromic filters in the color-fading state and the light transmittance (15) in the discolored state after 15 minutes of illumination shall not be less than 1.25, that is, . The inspection shall be carried out according to the method
specified in 6.12 of GB/T 39552.2-2020. It can also be inspected according to other temperatures or irradiation intensity provided by the manufacturer, but relevant technical information shall be provided.
5.5.2 Polarizing filters and polarizing sunglasses
The deviation of the transmission plane of the polarizing filters from the vertical direction or the indicated direction shall not be greater than ??5??. The difference between the transmission planes of the left and right filters of the sunglasses shall not exceed 6??.
The sunglasses clip shall be clamped on the frame. Measure the polarization deviation at the wearing position.
For category 2, category 3, and category 4 polarizing filters, when testing according to the method specified in 7.10.2 of ISO 12311:2013, its polarization efficiency shall be greater than 78%. For category 1 polarizing filters, it shall be greater than 60%. Category 0 filters do not have any useful polarization effects. 5.6 Express requirements for transmittance
5.6.1 Blue light absorption and transmittance
5.6.1.1 Blue light absorption rate
When the blue light absorption rate of sunglasses and sunglare filters is x%, the solar blue light transmittance shall not be greater than (100.5-x)%. 5.6.1.2 Blue light transmittance
When the blue light transmittance of sunglasses and sunglare filters is less than x%, the solar blue light transmittance shall not be greater than (x+0.5)%. 5.6.2 UV spectrum absorbance and transmittance
5.6.2.1 UV absorption rate
When sunglasses and sunglare filters indicate that their UV absorption rate is x%, their solar UV transmittance shall not be greater than (100.5-x)%.
5.6.2.2 UV transmittance
When sunglasses and sunglare filters indicate that the ultraviolet transmittance is less than x%, the solar ultraviolet transmittance shall not be greater than (x+0.5)%.
5.6.2.3 Ultraviolet band A absorption rate
When sunglasses and sunglare filters indicate that the ultraviolet band A absorption rate is x%, the solar ultraviolet band A transmittance shall not be greater than (100.5-x)%.
5.6.2.4 Ultraviolet band A transmittance
When sunglasses and sunglare filters clearly indicate that the ultraviolet band A transmittance is less than x%, the solar ultraviolet band A transmittance shall not be greater than (x+0.5)%.
5.6.2.5 Ultraviolet band B absorption rate
When sunglasses and sunglare filters indicate that the ultraviolet band B b) For photochromic filters, ;
c) The ultraviolet spectrum transmittance requirements in Table 1;
d) Specify the requirements for transmittance and reflection performance. 10 Flame retardant
Test according to the method specified in 8.4 of GB/T 39552.2-2020. All parts of the sunglasses (including at least the temples, rings and filters) shall not continue to burn.
11 Coating performance
11.1 Sweat resistance
11.1.1 Test according to the method specified in 8.5.1 of GB/T 39552.2-2020. In the test to 8h and 24h, respectively, visually inspect the specified parts. The sample shall:
a) At 8h, the spectacle frame (excluding hinges and screws) has no corrosion points or discoloration (excluding surface loss);
b) At 24h, the coating layer on the parts of the spectacle frame that are easy to contact with the skin (such as the inner side of the temple, the bottom and lower part of the spectacle frame, the inner side of the bridge of the nose) does not corrode, degrade or fall off.
11.1.2 If the spectacle frame is made of natural organic materials, and the manufacturer recommends using grease or wax for maintenance in the
instructions for use, grease or wax shall be prepared before the test according to the instructions. When the test is over, and the surface of the frame is discolored or the surface degradation does not meet the requirements, use grease or wax to pre-treat the surface of the frame. Check the surface
discoloration or surface degradation after one day. If the frame is restored to its original state, it is determined that the frame has passed the test. If there is still discoloration or degradation, the frame is judged to fail the test.
11.2 Coating adhesion
For spectacle frames with surface coating layer (such as electroplating layer, organic film layer) on the temples, test according to the method specified in 8.5 of GB/T 14214-2019. After one side is subjected to the test, there shall be no peeling off of the coating.
12 Dimensions of sunglare filters
Sunglasses shall cover two oval areas. The horizontal dimension of the ellipse is not less than 40mm, and the vertical dimension is not less than 28mm. The horizontal center distance is 64mm, which is symmetrical to both sides of the center of the nose bridge of the frame.
Sunglasses designed for children shall cover two oval areas. The horizontal dimension of the ellipse is not less than 34mm, and the vertical dimension is not less than 24mm. The horizontal center distance is 54mm, which is
symmetrical to both sides of the center of the nose bridge of the frame. It can also be measured according to the horizontal center distance determined by the manufacturer according to the technical information provided by the manufacturer.
13 Impact resistance
13.1 Clearly-indicated impact resistance level 1 (16g drop ball test)
If the sunglasses or sunglare filters are clearly impact resistant (impact resistance level 1) or are not marked "cannot be used to protect the eyes from mechanical damage" instructions, perform inspection according to the methods specified in 8.6.2 and 8.6.3 of GB/T 39552.2-2020. The lens shall not be fractured.
13.2 Clearly-indicated impact resistance level 2 (43g drop ball test)
If the sunglasses or sunglare filters are clearly shown to have impact resistance level 2, perform inspection according to the methods specified in 8.6.4 of GB/T 39552.2-2020. The lens shall not be fractured.
13.3 Clearly-indicated impact resistance level 3 (high-speed particle
impact test)
If the sunglasses or sunglare filters are clearly indicated as having impact resistance level 3, perform inspection according to the methods specified in 8.6.5 of GB/T 39552.2-2020. The lens shall not be fractured.
14 Wear resistance
If sunglasses or sunglare filters express wear resistance, the filters shall meet the minimum wear resistance requirements in GB 10810.5.
Annex B
(informative)
Instructions for use for sunglare filters
B.1 Daytime
Sunglare filters are mainly used to protect human eyes from excessive sunlight, reduce visual fatigue, and improve visual ability. The choice of sunglare filters depends on the intensity of the surrounding environment and the sensitivity of each person to glare. If in doubt, consult a professional ophthalmologist. In addition to reducing the glare, sunglare filters can also avoid the damage of ultraviolet rays to human eyes.
WARNING: This Part does not apply to special filters that can directly observe the sun (such as observing solar eclipses).
B.2 Light diminishing
As the light diminishes, the light-sensitive ability of the sunglare filters will also decrease. The darker the filters, the lower the light transmittance of the sunglare filters, and the worse its visibility. Sunglare filters with a light transmittance of less than 75% are not suitable for use in dim light. For photochromic filters that can meet the requirements of 6.12 in GB/T 39552.2-2020, if the light
transmittance in the darkened state is greater than 75%, it can be used when the light is dim.
B.3 Photochromic sunglare filters
Since the light transmittance of photochromic sunglare filters depends on the intensity of light radiation, temperature and other factors, there may be special cases where the light transmittance of the filters does not match its classification range. These special cases include:
a) In a low temperature environment (such as winter), the transmittance of the filters will decrease;
b) In high temperature environments (such as midsummer, tropical areas), the transmittance of the filters will increase;
c) In a weak radiation environment (such as when driving a car), the
transmittance of the filters will increase.
B.4 Blue light hazard
If the current evaluation method is used to evaluate the surface solar radiation, even in an environment with extremely strong light (such as snowy surfaces), the blue light in the solar spectrum does not pose actual hazards to the human body, so this Part does not specify the mandatory requirements for blue light. However, there are still disagreements on whether blue light will harm human health. In order to correctly describe the protective ability of sunglare filters against blue light, this Part gives the requirements for blue light transmittance. But it needs to be pointed out that because sunlight has extremely high spectral radiation and the solar spectrum is rich in blue light, it is very dangerous to look directly at the sun.
B.5 Infrared hazard
If the current evaluation method is used to evaluate the surface solar radiation, even in an environment with extremely strong light (such as snow-covered surfaces), the infrared spectrum in the solar spectrum does not pose actual hazards to the human body, so this Part does not specify mandatory
requirements for infrared spectrum. In order to correctly describe the protection ability of sunglasses against infrared radiation, this Part gives the requirements for infrared transmittance.
B.6 UV hazards
When humans are not wearing sunglasses, human eyes have a natural
protective response to glare. This protective response can reduce the
excessive radiation of outdoor light and reduce the light flux entering the eyes by squinting. Generally, sunglasses without side protection may cause damage to eye tissues due to the Coroneo effect. In order to calculate corneal irradiance, the analysis of solar ultraviolet light shows that, in temperate regions, the biggest factor affecting human eye exposure is seasonal changes in solar radiation. At the same time, surface reflections, changes in the radiation time of noon sunlight, changes in altitude, and the opening and closing of the eyes will significantly affect the corneal irradiance. The limit value of the UV
transmittance of sunglasses is calculated based on the bio-weighted exposure. This includes various abnormal exposures other than the snow factor, such as the anomalous exposure of snowfields in tropical conditions, late spring, and normal terrain in mid-latitudes. The above influencing factors will ensure that the ultraviolet transmittance limit value will not exceed the recognized safety limit. Therefore, the specification of the spectral (replacement of the average and weighting factor) transmittance limit value has a greater and further improvement in the safety factor than the previous one.
B.7 Road use and driving
This Part specifies the requirements for road use and driving sunglare filters under normal conditions in detail. Category 4 sunglasses are not suitable for

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