SPE-PP columns CHROMABOND® SiOH, 1 ml vol., absorbent weight 100 mg, 100 unit(s)SPE PP columns CHROMABOND SiOH, 1 ml vol., absorbent weight 100 mg Material: PP columns with PE filter elements. Further attractive products to complete your chromatography laboratory can be found on our Chromatographypage! Unmodified, slightly acidic silica gel Please note: Extremely polar! Adsorbs air humidity. Should be kept well closed and if necessary dried prior to use. Due to its high affinity for polar compounds it should not be conditioned