1. Introduction  In global construction chemical trade, correct HS Code classification is essential for customs clearance, tax calculation, and smooth international logistics. Polycarboxylate Superplasticizer (PCE) is a high-performance concrete admixture widely used in: Ready-mix concrete production Precast concrete factories Pumped concrete systems Ultra-high-performance concrete (UHPC) As global infrastructure demand increases, accurate HS classification becomes critical […]