... , hydrogen sulfide, sulfur dioxide, carbon dioxide, ethylene, propylene, and does not adsorb any molecular larger than 4A(including propane ... natural gas, paraffin gas ,liquid cooling agent and so on, and liquid. * Preparation and purification of argon gas. * The static desiccation ... Otherwise,it should be renewable. 7.Products should produce in accordance with HG/T2524-93 standard. Molecular sieve 4A