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See Chinese contents: GB/T 24721.5-2023 GB/T 24721.5-2023: Glass fiber reinforced plastic product for highway -- Part 5: Sign base panel
This document specifies the product structures, dimensions and deviations, technical requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage requirements for glass fiber reinforced plastic sign base panel for highway. This document is applicable to the production, inspection and usage of glass fiber reinforced plastic sign base panel for highway (hereinafter referred to as ¡°glass fiber reinforced sign base panel¡±).
