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English versions: GB/T 25715-2023
GB/T 18690
English versions: GB 15979-2024
English versions: GB/T 44953-2024
YY/T 0866-2024_Chinese: Total inward leakage(TIL) determination method of protective face mask for medical use (Chinese: 医用防护口罩总泄漏率测试方法)
GB/T 24632.2-2024 Chinese PDF (GB/T24632.2-2024) GB/T 43253.2-2023 English versions: GB/T 25715-2023GB T 24632. 2 2024_Chinese: Geometrical product specifications(GPS) Roundness Part 2: Specification operators (Chinese: GPS 2) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 24632. 2 2024
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