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See Chinese contents: GB 39552.1-2020 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.
