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3 µm porous silica particles with PEG 2000 coating are supplied in water. Standard deviation: < 0.85 µm. We can also provide these particles with controlled pore siz 60 A, 100 A or 300 A as request. https://www.cd-bioparticles.com/product/diagnano-peg-2000-silica-particles-3-m-item-dng-s015-1632.html