1 change color from orange to greenish. 2 regular shape orange silica gel. 3 prompt ... glass-like pellet or lump.average pore diameter:2.0-3.0nm. specific surface area:650-800m ... ITEMTypical valuesAdsorption capacityRH=20%,%≥11.2RH=50%,%≥29.2RH=90%,%≥37.6Loss on heating,% ≤2.0PH value4.5Specific resistance,Ω. cm ≥ ... ≥90Size2-5mmBulk density, g/L784Sizes:1-3mm,2-4mm,3-5mm 2-4mm orange silica gel bead