Chelex® 100 Chelating Resin, molecular biology grade, 200–400 mesh, sodium form, 50 g #1421253EDU


50 g, molecular biology grade cation exchange resin, sodium form, 1% crosslinkage, 200–400 dry mesh size, 75–150 µm wet bead size, ~3,500 MW limit; education use only
Safety Data Sheet

Safety Data Sheet



Choose molecular biology grade Chelex 100 Resin, a weak cation exchange media, for chelation, DNA extraction for PCR, and other cation exchange protocols. Use this sodium-form resin for gravity or low-pressure chromatography.

  • Fine-mesh resin is effective for high resolution analytical protocols
  • Selectivity for divalent over monovalent ions is approximately 5,000 to 1
  • Strong attraction for transition metals, even in highly concentrated salt solutions
  • Inactivates enzymes, including DNases, that require divalent cations for activity
  • Certified to be endo- and exonuclease-free, and to contain no ligase inhibitors
  • Larger volumes and special packaging are available upon request

Product Options

Resin Strength Grade* Crosslink Ionic Form Dry Mesh Wet Bead Size µm MW Limit Catalog Number
Chelex 100 Weak Analytical 1% Sodium 100–200 150–300 ~3,500 1422832EDU
Chelex 100 Weak Analytical 1% Sodium 200–400 75–150 ~3,500 1422842EDU
Chelex 100 Weak Mol Bio 1% Sodium 200–400 75–150 ~3,500 1421253EDU

*Biotechnology grade resin is certified to contain less than 100 microorganisms per gram; molecular-biology-grade resin is certified to be endo- and exonuclease-free and contain no ligase inhibitors.

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