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See Chinese contents: GB/T 24721.4-2023 GB/T 24721.4-2023: Glass fiber reinforced plastic product for highway -- Part 4: Non-pressure communication well lid
This document specifies the structure, dimensions and deviations, model, technical requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage requirements of glass fiber reinforced plastic non-pressure communication well lid products for highway. This document is applicable to the production, inspection and usage of glass fiber reinforced plastic non-pressure communication well lid (hereinafter referred to as ¡°glass fiber reinforced communication well lid¡±) for non-vehicle driving areas on highways.
