Molecular sieve
Molecular sieve is a material with very small holes of precise and uniform size. These holes are small enough to block large molecules while allowing small molecules to pass. Molecular is widely used as high efficiency desiccant, selective adsorption agent, catalyst, ion exchange agent. Common molecular sieves are crystalline silicate or aluminosilicate. 

Molecular sieves are often utilized in the petroleum industry, especially for the purification of gas streams and in the chemistry laboratory for separating compounds and drying reaction starting materials. Mainly used in automotive, architectural glass, medicine, paint coating, packaging and other fields.
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