GB/T 24021-2024 Chinese PDF (GB/T24021-2024) GB/T 2820.7-2024 GB/T 45355-2025_Chinese: Polyethylene(PE) piping systems

GB/T 45355-2025_Chinese: Polyethylene(PE) piping systems for non-pressure buried drainage and sewerage (Chinese: 无压埋地排污、排水用聚乙烯（PE）管道系统)

GB/T 18737

English versions: GB/T 15843

GB/T 25503-2024_Chinese: Requirements in sell and market service of city gas burning-appliances (Chinese: 城镇燃气燃烧器具销售和售后服务要求)

GB/T 13217

GB/T 24021-2024 Chinese PDF (GB/T24021-2024) GB/T 2820.7-2024 GB/T 45355-2025_Chinese: Polyethylene(PE) piping systemsGB T 24021 2024_Chinese: Environmental management Environmental labels and declarations Self declared environmental claims (Type II environmental labelling) (Chinese: II) Note Careful: Text of PDF is in Chinese (not English). Delivery (PDF in Chinese): 2 working hours typically, ASAP English versions: GB T 24021 2024