http://www.sd-alumina.com/pseudo-boehmite/
Pseudo Boehmite made in China Molecular Sieve 4A The aperture of the molecular sieve 4A is 4A, which adsorb water, methanol, ethanol, hydrogen sulfide, sulfur dioxide, carbon dioxide, ethylene, propylene, does not adsorb any molecules more than (including propane) a diameter greater than 4A, and the selective adsorption performance of water is higher than that of any other molecule. It is one of the largest molecular sieve varieties in industry. The molecular sieve 4A is an alkali metal aluminosilicate that adsorbs molecules with critical diameters of water, NH3, H2S, sulfur dioxide, carbon
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