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The pore size of 3A molecular sieve is 3Ǻ. It does not adsorb any molecular larger than 3 Ǻ. According to the industrial application specialities. We endure our products with the characters of higher adsorption speed, stronger crushing and anticontamination resistance, more cyclic times and longer work-span. All these advantages have made it come to be the most essential and necessary desiccant in the fields of the deep drying, refinery, polymerization for cracked gases, ethylene, propylene and any other non-acidic gases or liquids in petroleum and chemical industries.