Ahlstrom Grade 642 is a thin chromatography paper with a slower flow rate for higher resolution. It is recommended for optical or radiometric scanning techniques. Thickness: 0.21 mm. Absorption speed: 120 mm / 30 min. Ahlstrom manufactures a complete line of high quality chromatography electrophoresis and blotting papers for use in gel transfer applications and chromatography techniques. These uniform smooth white sheets are the high purity high quality and high value standard. They are used in nucleic acid research such as Southern Northern and Western blots electroblotting and electrophoresis. Ahlstrom chromatography electrophoresis and blotting papers are made from high purity and 100% FDA compliant alpha cotton cellulose using ultra-pure RO water and contain no additives that could cause increased backgrounds or other interference in detection systems. Ahlstrom Laboratory Filter Catalog About Ahlstrom Filter Grades (pdf)

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