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See Chinese contents: GB/T 24721.3-2023 GB/T 24721.3-2023: Glass fiber reinforced plastic product for highway -- Part 3: Duct
This document specifies the product classification, structures, dimensions and deviations, model, technical requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage requirements for glass fiber reinforced plastic duct for highway. This document is applicable to the production, inspection and usage of glass fiber reinforced plastic duct for highway (hereinafter referred to as ¡°glass fiber reinforced duct¡±).
