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GB/T 39552 consists of the following two parts under the general title Sunglasses and sunglare filters:
——Part 1: General requirements;
——Part 2: Test methods.
This is Part 1 of GB/T 39552.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part is modified in relation to ISO 12312-1:2013 Eye and face protection - Sunglasses and related eyewear - Part 1: Sunglasses for general use.
This part has been changed largely from ISO 12312-1:2013 in terms of structure. See Annex A for the comparison between this part and ISO 12312-1:2013 in clause No.
The main technical differences with respect to ISO 12312-1:2013 and their reasons are as follows:
——As for the normative references, technical adjustments are made to this part to keep them in line with the technical conditions in China. The adjustments are embodied in a concentrated way in Clause 2 "Normative references", specifically as follows:
? GB 10810.1 (see 6.1.5), GB/T 14214-2019 (see 11.2), GB/T 26397 (see Clause 3), and GB/T 39552.2-2020 (see Clauses 5, 6, 7, 8, 9, 10 and 13 and subclause 11.1) are added for reference;
? GB 10810.5 modified in relation to the international standard is used to replace ISO 8980-5 (see Clause 14);
? ISO 4007 is deleted.
——In Clause 6, the requirements of local variations in refractive power are deleted and in Clause 12, the temporal protective requirements are deleted to adapt to the technical conditions in China.
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——The requirements for transmittance performance of medically prescribed corrective sunglasses and sunglare filters, the requirements for solar spectral transmittance below cut-off wavelength (see Clause 5), adhesion of coating layer (see Clause 11) and nickel release (see Clause 15) are added; the corresponding requirements of filter impact-resistance strength (see Clause 13) are adjusted to meet market demand.
——Annex B is deleted, while relevant technical requirements of Annex B are merged into Clauses 5, 6, 13 and 17 respectively so as to increase the operability of standard contents.
This part was proposed by and is under the jurisdiction of the Ministry of Industry and Information Technology of the People's Republic of China.
Sunglasses and sunglare filters – Part 1: General requirements
1 Scope
This part of GB/T 39552 specifies the classification, requirements, selection of test samples, marking and packaging of afocal sunglasses and sunglare filters.
This part is applicable to sunglasses, sunglare filters and clip-ons for general use, including road use and driving. The transmittance requirements of medically-prescribed corrective sunglasses and sunglare filters may refer to this part.
This part is not applicable to filters for protection against radiation from artificial light sources, such as those used in solaria, goggles for industrial use, and special filters intended for direct observation of the sun, such as for viewing a solar eclipse.
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, ISO 13666:1998, 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 given in GB/T 26397 and the following apply.
3.1
lens fractured
in any one of the following cases, the lens is regarded as fractured:
a) The lens is split into two or more pieces;
b) Fragments of the lens fall from the side near the eye;
c) The lens is directly penetrated
3.2
decentred sunglasses
sunglasses designed to eliminate prism effect caused by filter base curve
4 Construction and materials
4.1 Construction
Areas of the sunglass, including the frame and the filters that might come into contact with the wearer, shall be without sharp projections that may harm the human body.
4.2 Filter material and surface quality
Except in a marginal area 5 mm wide, filters shall have no defects, superficially or internally, within an area of 30 mm diameter around the reference point that might impair vision. However, isolated and minor internal or surface defects may exist beyond such area.
4.3 Physiological compatibility
Sunglasses shall be designed and manufactured in such a way that when used under the conditions and for the purposes intended, they will not compromise the health and safety of the wearer. The risks posed by substances leaking from the device that may come into prolonged contact with the skin shall be reduced by the manufacturer to below any regulatory limit. Special attention shall be given to substances which are allergenic, carcinogenic, mutagenic or toxic to reproduction.
5 Transmittance
5.1 Transmittance and classification requirements
5.1.1 Depending upon their luminous transmittance, filters shall be attributed to one of five filter categories, namely 0, 1, 2, 3 and 4 (see Table 1), of which, categories 0 and 1 are light tint sunglasses, categories 2 and 3 are general purpose sunglasses, and category 4 are special purpose sunglasses.
5.1.2 An overlap of the transmittance values shall be not more than ± 2% (absolute) between the categories 0, 1, 2 and 3 of evenly colored filter. There is no overlap in transmittance values between categories 3 and 4.
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5.1.3 An overlap of the transmittance values shall be not more than ± 4% (absolute) between the categories 0, 1, 2 and 3 of gradient filter. There is no overlap in transmittance values between categories 3 and 4.
5.1.4 The maximum deviation for luminous transmittance value declared by the supplier shall be ±3% absolute for the transmittance values falling in categories 0 to 3 and ±30% relative to the stated value for the transmittance values falling in category 4.
5.1.5 When describing the transmittance properties of photochromic filters, two categories for transmittance values are generally used. These two values correspond to the faded state and to the darkened state of the filter, and their classifications shall comply with Table 1.
