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Precast concrete products. Elements for fences Ingestion-build-84997 Colorimetry is a technique usedWhat is BS EN 12839 Precast concrete products for fences about? BS EN 12839 specifies precast products in reinforced or pre stressed concrete with or without fibres, to be used together or in combination with other elements to erect fences e. g., boundary fences. BS EN 12839 covers both mechanical resistances determined by calculation and load bearing capacity determined by testing. Note 1: Normal weight concrete or lightweight concrete elements