Molecular sieve, also known as synthetic sodium alumina silicate is a unique adsorbent with a very unique pore structure. This product can be developed so that differentiation in actual pore openings is as small as one angstrom (1 angstrom = 1/1000 of a human hair). It is by far the best choice in terms of desiccant for companies looking to maintain the lowest possible relative humidity.
Molecular sieves retain their ability to adsorb water molecules over a much wider spectrum of temperatures than other desiccant materials. Molecular sieves also have a much higher equilibrium capacity for water vapor under very low humidity conditions. Molecular sieves contain a uniform network of crystalline pores and empty adsorption cavities, which give it an internal adsorptive surface area of 700 to 800 gm2 (1/2 the total volume of the crystals). Because of its uniform structure, molecular sieves will not desorb moisture into the package as readily as silica gel or clay as temperatures rise.
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