A molecular sieve is a crystalline metal aluminosilicate with an alumina tetrahedra interconnected network. This network’s natural water of hydration is eliminated by heating, creating homogeneous voids that only adsorb molecules of a particular size.

It is also known as zeolite or molsieve and consists of uniform pores to adsorb contaminants on the packed items. It can purify, dehydrate, and separate liquid substances and gases. It can adsorb up to 22% of its weight. It is commonly used to reduce humidity levels, making it suitable for machinery applications.