This document specifies the molecular formula, structural formula, relative molecular mass, CAS number, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of the polymer additive tris(2-hydroxyethyl)isocyanurate. . This document is applicable to the inspection of tris(2-hydroxyethyl)isocyanurate prepared by alkylation reaction using cyanuric acid and ethylene oxide as raw materials under the catalytic dispersion of a specific catalyst/solvent.