약산성 carboxylic 양이온 교환기, exchange capacity >0.7 meq/g, pKa ~ 5, base material spherical PS/DVB copolymer, pH stability 1–14
구형 입자, 45 μm 및 85 μm (standard) 사이즈, pore size 50–60 Å
very large specific surface 850 m2/g, pore volume 1.2–1.4 cm3/g, RP capacity 350 mg/g (caffeine in water)
